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Bernoulli’s Equation: P + ½ρv² + ρgh = constant Mind-bending science that looks like pure sorcery! A lightweight paper loop floats and dances in a high-velocity air stream, seemingly defying gravity. Fast-moving air over and around the loop creates a low-pressure zone above and along its curved surfaces. Higher...

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Mathematica

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56,267 次观看 • 3 个月前 •via X (Twitter)

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Bernoulli's Principle It’s a key idea in fluid dynamics named after Daniel Bernoulli. In simple terms: For a fluid flowing smoothly, an increase in the fluid’s speed happens at the same time as a decrease in pressure or a decrease in the fluid’s potential energy. Where: - P = pressure in the fluid - ρ = fluid density - v = flow velocity - g = acceleration due to gravity - h = height above a reference point Bernoulli's Principle basically says that for a fluid that's flowing smoothly, when its speed goes up, its pressure goes down. Think of it like this: fast-moving air or water pushes less sideways than slow-moving air or water. The energy in the fluid stays the same overall, but it shifts between motion, pressure, and height. That's why an airplane wing creates lift. The air moves faster over the curved top of the wing than underneath, so the pressure on top is lower. The higher pressure below pushes the wing up.
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Bernoulli's Principle It’s a key idea in fluid dynamics named after Daniel Bernoulli. In simple terms: For a fluid flowing smoothly, an increase in the fluid’s speed happens at the same time as a decrease in pressure or a decrease in the fluid’s potential energy. Where: - P = pressure in the fluid - ρ = fluid density - v = flow velocity - g = acceleration due to gravity - h = height above a reference point Bernoulli's Principle basically says that for a fluid that's flowing smoothly, when its speed goes up, its pressure goes down. Think of it like this: fast-moving air or water pushes less sideways than slow-moving air or water. The energy in the fluid stays the same overall, but it shifts between motion, pressure, and height. That's why an airplane wing creates lift. The air moves faster over the curved top of the wing than underneath, so the pressure on top is lower. The higher pressure below pushes the wing up.

Sam Mathverse

27,791 次观看 • 3 个月前

Bernoulli's Principle states that "fast moving fluid creates low pressure". The guy created low pressure outside with the water and air moves from high pressure to low pressure so it quickly sucked out the air from the room which creates deficiency of oxygen in the room and fire went out.
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Bernoulli's Principle states that "fast moving fluid creates low pressure". The guy created low pressure outside with the water and air moves from high pressure to low pressure so it quickly sucked out the air from the room which creates deficiency of oxygen in the room and fire went out.

Historic Vids

7,478,904 次观看 • 2 年前

The greatest atmospheric ballet... simply air and moisture doing their duty. Seen here is perhaps the most beautiful NEXRAD radar loop I can possibly produce.. A near-endless stream of larger-scale, swirly, "radargenic" mesovortices rolling southward along a convergence boundary atop lake Michigan. One of the prettiest things our atmosphere can produce, and it just kept on doing it for hours upon hours! This radar loop covers approximately 14 hours, throughout 2024/01/19, starting at approximately 07z and ending around 21z. Longest loop I've made so far with the new python script! And probably my favorite...
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The greatest atmospheric ballet... simply air and moisture doing their duty. Seen here is perhaps the most beautiful NEXRAD radar loop I can possibly produce.. A near-endless stream of larger-scale, swirly, "radargenic" mesovortices rolling southward along a convergence boundary atop lake Michigan. One of the prettiest things our atmosphere can produce, and it just kept on doing it for hours upon hours! This radar loop covers approximately 14 hours, throughout 2024/01/19, starting at approximately 07z and ending around 21z. Longest loop I've made so far with the new python script! And probably my favorite...

wxKobold

58,462 次观看 • 9 个月前

Satya Nadella: Microsoft’s latest Wisconsin AI data center keeps yearly water consumption no higher than that of 1 local restaurant. "The cooling loop is filled once and the data centre can operate effectively with zero water consumption. Daily water usage across a year is roughly equivalent to what a single restaurant would use" The mechanism is mainly about replacing evaporative cooling with closed-loop direct-to-chip liquid cooling, so water moves like coolant inside a sealed machine rather than being boiled off into the air. Hot GB200-class AI racks produce too much heat for normal air cooling, so cold liquid is pushed through pipes into the servers and across metal cold plates touching the hottest chips. The liquid enters the rack cool, absorbs heat from the chips through cold plates, then exits the rack at a higher temperature and carries that heat through pipes to a huge cooling system outside the compute floor. Microsoft says Fairwater sends that hot water to cooling “fins” beside the datacenter, where 172 20-foot fans blow air across the fins and dump the heat into the outside air. The important detail is that the air cools the water through metal surfaces, so the water does not need to evaporate the way many older datacenters use cooling towers. The cooled liquid then returns to the servers, repeats the loop, and keeps absorbing heat from the chips. In older data centers, heat is often removed partly through cooling towers. Hot water meets moving air, some water evaporates, and that phase change carries heat away. Effective, but it consumes fresh water continuously. But Firwater is a closed loop because the same coolant keeps circulating through sealed pipes: it absorbs heat from the chips, releases that heat through radiator-like fins, then flows back to the chips again. For Wisconsin Fairwater, Microsoft says more than 90% of the facility uses closed-loop liquid cooling, while the remaining portion uses outside air and switches to water only on the hottest days. ---- From "Microsoft" YouTube channel, (link in comment)
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Satya Nadella: Microsoft’s latest Wisconsin AI data center keeps yearly water consumption no higher than that of 1 local restaurant. "The cooling loop is filled once and the data centre can operate effectively with zero water consumption. Daily water usage across a year is roughly equivalent to what a single restaurant would use" The mechanism is mainly about replacing evaporative cooling with closed-loop direct-to-chip liquid cooling, so water moves like coolant inside a sealed machine rather than being boiled off into the air. Hot GB200-class AI racks produce too much heat for normal air cooling, so cold liquid is pushed through pipes into the servers and across metal cold plates touching the hottest chips. The liquid enters the rack cool, absorbs heat from the chips through cold plates, then exits the rack at a higher temperature and carries that heat through pipes to a huge cooling system outside the compute floor. Microsoft says Fairwater sends that hot water to cooling “fins” beside the datacenter, where 172 20-foot fans blow air across the fins and dump the heat into the outside air. The important detail is that the air cools the water through metal surfaces, so the water does not need to evaporate the way many older datacenters use cooling towers. The cooled liquid then returns to the servers, repeats the loop, and keeps absorbing heat from the chips. In older data centers, heat is often removed partly through cooling towers. Hot water meets moving air, some water evaporates, and that phase change carries heat away. Effective, but it consumes fresh water continuously. But Firwater is a closed loop because the same coolant keeps circulating through sealed pipes: it absorbs heat from the chips, releases that heat through radiator-like fins, then flows back to the chips again. For Wisconsin Fairwater, Microsoft says more than 90% of the facility uses closed-loop liquid cooling, while the remaining portion uses outside air and switches to water only on the hottest days. ---- From "Microsoft" YouTube channel, (link in comment)

Rohan Paul

28,510 次观看 • 2 个月前

When you throw a paper airplane on Earth the wings create a lift that pulls it up, but gravity pulls it down; this mix makes it glide forward and down. In microgravity, the wings still create lift, but with nothing to pull the nose down, the lift force causes the plane to turn. If there were enough room, the airplane would fly in loops until it ran out of speed and drifted.
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When you throw a paper airplane on Earth the wings create a lift that pulls it up, but gravity pulls it down; this mix makes it glide forward and down. In microgravity, the wings still create lift, but with nothing to pull the nose down, the lift force causes the plane to turn. If there were enough room, the airplane would fly in loops until it ran out of speed and drifted.

Koichi Wakata 若田光一

2,037,162 次观看 • 1 个月前

That’s insane! 🤯 A student built an acoustic levitation divide with an Arduino board. He built it using an Arduino Nano, a motor driver, and 60 ultrasonic transducers that can levitate low-density objects in place indefinitely. The transducers send out 40 kHz waves that create standing waves. The interference pattern produces nulls that trap objects. High-pressure areas form below and above the object, locking it in the low-pressure area between them. The transducers produce two sound waves moving in opposing directions at the same frequency and amplitude. The effect is that the low-pressure areas don't appear to move, like whipping a rope from both ends and having the wave meet in the middle. Sound waves are oscillating at high and low pressures. By creating a sound wave that doesn't move forward (a standing wave), you create areas of constant pressure. 🔉 Objects get trapped in the null points between high-pressure zones. The craziest part is that this was made more than 7 years ago! DIY levitation 😮‍💨 Reddit link: ~~ ♻️ Join the weekly robotics newsletter, and never miss any news →
0:16

That’s insane! 🤯 A student built an acoustic levitation divide with an Arduino board. He built it using an Arduino Nano, a motor driver, and 60 ultrasonic transducers that can levitate low-density objects in place indefinitely. The transducers send out 40 kHz waves that create standing waves. The interference pattern produces nulls that trap objects. High-pressure areas form below and above the object, locking it in the low-pressure area between them. The transducers produce two sound waves moving in opposing directions at the same frequency and amplitude. The effect is that the low-pressure areas don't appear to move, like whipping a rope from both ends and having the wave meet in the middle. Sound waves are oscillating at high and low pressures. By creating a sound wave that doesn't move forward (a standing wave), you create areas of constant pressure. 🔉 Objects get trapped in the null points between high-pressure zones. The craziest part is that this was made more than 7 years ago! DIY levitation 😮‍💨 Reddit link: ~~ ♻️ Join the weekly robotics newsletter, and never miss any news →

Lukas Ziegler

99,272 次观看 • 3 个月前

No robots. No vision. No AI. Just a vibratory bowl feeder, a 2-axis pick-and-place, a turntable, and a gravity slide. This is the automation that actually runs the world. Bowl feeders have been orienting parts since the 1950s. Vibration and geometry—nothing else. Parts walk up a spiral track and fall into line. Pneumatic cylinders move on two axes—up/down and rotate. Hard stops set the positions. No encoders. No feedback loops. Just air pressure hitting a mechanical limit. Air jets blow parts down the slides. Gravity gets a helping hand from a tiny pulse of air to keep the flow consistent. Inflexible? Absolutely. One product, one machine. But for high-volume production, nothing beats it on cost, speed, or reliability. The unsexy backbone of manufacturing.
0:16

No robots. No vision. No AI. Just a vibratory bowl feeder, a 2-axis pick-and-place, a turntable, and a gravity slide. This is the automation that actually runs the world. Bowl feeders have been orienting parts since the 1950s. Vibration and geometry—nothing else. Parts walk up a spiral track and fall into line. Pneumatic cylinders move on two axes—up/down and rotate. Hard stops set the positions. No encoders. No feedback loops. Just air pressure hitting a mechanical limit. Air jets blow parts down the slides. Gravity gets a helping hand from a tiny pulse of air to keep the flow consistent. Inflexible? Absolutely. One product, one machine. But for high-volume production, nothing beats it on cost, speed, or reliability. The unsexy backbone of manufacturing.

Jack 🤖

39,565 次观看 • 8 个月前

This is a device I use in my office: it draws outdoor air from outside the window into the room, passes it through a filter, and then vents it indoors. The excess air pressure pushes indoor air out through the gaps around the door. This way, indoor carbon dioxide, particulate matter, and VOCs can be reduced to very low levels. Even an air purifier with activated carbon cannot achieve this effect, because air purifiers cannot lower CO2 concentration. This device is modified from an AirFanta 3Pro. I reversed the fan installation and connected two reducing adapters so that the final diameter matches that of this plastic expandable duct. Finally, I sealed the window with a sealing fabric, leaving only an opening the same size as the duct. Its only drawback is the lack of heat exchange, so it requires some additional air conditioning load. It would be unsuitable in very cold or very hot places.
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This is a device I use in my office: it draws outdoor air from outside the window into the room, passes it through a filter, and then vents it indoors. The excess air pressure pushes indoor air out through the gaps around the door. This way, indoor carbon dioxide, particulate matter, and VOCs can be reduced to very low levels. Even an air purifier with activated carbon cannot achieve this effect, because air purifiers cannot lower CO2 concentration. This device is modified from an AirFanta 3Pro. I reversed the fan installation and connected two reducing adapters so that the final diameter matches that of this plastic expandable duct. Finally, I sealed the window with a sealing fabric, leaving only an opening the same size as the duct. Its only drawback is the lack of heat exchange, so it requires some additional air conditioning load. It would be unsuitable in very cold or very hot places.

Adam Wong

85,756 次观看 • 4 个月前

Guangxi and Hunan, blow strong winds from their entrances. This happens because of their special shapes and natural air pressure changes, not magic. In Guangxi’s karst caves and sinkholes, the air can be so strong it feels like a storm when you stand at the opening. 📌 Location: Guangxi & Hunan, China
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Guangxi and Hunan, blow strong winds from their entrances. This happens because of their special shapes and natural air pressure changes, not magic. In Guangxi’s karst caves and sinkholes, the air can be so strong it feels like a storm when you stand at the opening. 📌 Location: Guangxi & Hunan, China

Enezator 1 Mn

15,302 次观看 • 11 个月前

If you are using an if statement inside a for loop, did you know there's a better way of doing this is Swift? I'm talking about the where clause. Using the where clause in a for loop can provide several benefits over using an if statement inside a for loop: Readability: It explicitly states the condition that must be met for an element to be processed, making the purpose of the loop clearer to anyone reading the code. Efficiency: When using a where clause, the filtering of elements is done at the level of the sequence, which can be more efficient than filtering within the loop with an if statement. Brevity: Using a where clause often results in more concise code, as it eliminates the need for an if statement and associated braces. This can make the code more manageable and easier to maintain.
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If you are using an if statement inside a for loop, did you know there's a better way of doing this is Swift? I'm talking about the where clause. Using the where clause in a for loop can provide several benefits over using an if statement inside a for loop: Readability: It explicitly states the condition that must be met for an element to be processed, making the purpose of the loop clearer to anyone reading the code. Efficiency: When using a where clause, the filtering of elements is done at the level of the sequence, which can be more efficient than filtering within the loop with an if statement. Brevity: Using a where clause often results in more concise code, as it eliminates the need for an if statement and associated braces. This can make the code more manageable and easier to maintain.

Everton Carneiro

23,416 次观看 • 2 年前

Free molecular flow! In high vacuum, the mean free path of an air molecule is so large that normal flow breaks down and starts to behave like an infinite pinball machine... so you need a turbomolecular pump! And if you want to lower pressure even more, it gets even weirder.
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Free molecular flow! In high vacuum, the mean free path of an air molecule is so large that normal flow breaks down and starts to behave like an infinite pinball machine... so you need a turbomolecular pump! And if you want to lower pressure even more, it gets even weirder.

Jordan Taylor

232,348 次观看 • 5 个月前

SOMEONE BUILT A VIRTUAL CAMERA THAT LOOPS A CLIP OF YOU LOOKING PRESENT SO YOU CAN LEAVE MID MEETING it records a few seconds of you looking engaged, then loops it through a fake webcam you pick once in zoom, google meet, slack or teams. one hotkey swaps your live feed for the loop, another brings you back. your audio stays on the whole time so you can step away for a minute without becoming the frozen black tile everyone notices > shows up as a real camera in every app, no screen share hacks > the loop doesnt read as a loop, it injects tiny stutters and catch up hitches so it looks like a slightly flaky connection > swap in and out instantly with a hotkey > universal, notarized, about 5mb, works on macos the fake bad connection detail is absolutely the evil genius part a frozen frame gets caught immediately but a feed that stutters like bad wifi is something nobody questions
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SOMEONE BUILT A VIRTUAL CAMERA THAT LOOPS A CLIP OF YOU LOOKING PRESENT SO YOU CAN LEAVE MID MEETING it records a few seconds of you looking engaged, then loops it through a fake webcam you pick once in zoom, google meet, slack or teams. one hotkey swaps your live feed for the loop, another brings you back. your audio stays on the whole time so you can step away for a minute without becoming the frozen black tile everyone notices > shows up as a real camera in every app, no screen share hacks > the loop doesnt read as a loop, it injects tiny stutters and catch up hitches so it looks like a slightly flaky connection > swap in and out instantly with a hotkey > universal, notarized, about 5mb, works on macos the fake bad connection detail is absolutely the evil genius part a frozen frame gets caught immediately but a feed that stutters like bad wifi is something nobody questions

Om Patel

123,301 次观看 • 1 个月前

I love your observation and it will make me discuss the remarkable adaptations that prevents giraffes from passing out and suffering brain damage when bending to drink water and when standing up. ADAPTATION 1 Did you know that the distance from the giraffe's heart to its brain is about 2 meters or more? That's more than the average humans height! Pumping blood up to that great distance and working against gravity is not a joke! That's where the giraffe's heart comes in. A giraffe's heart is unique in several ways. First, it is quite large, weighing up to 11kg and measuring about 2 feet long, which is necessary to pump blood up the long neck to the brain. Second, it has thick walls to generate enough pressure to overcome gravity and push the blood up to the head. ADAPTATION 2 Now, let's move to the neck. Before discussing the incredible roles the valves in the jugular veins perform, let's look at what can happen without them, and then the solution. Problem I: When the giraffe bends down to drink, blood rushes downward to the head. Gravity pulls a huge volume of blood toward the brain, which could cause dangerously high pressure in the head and potentially burst vessels or cause other damage. Solution: They have one-way valves in the jugular veins (the large veins in the neck). These prevent blood from rushing backward uncontrollably into the head when lowered. These valves help regulate and slow the downward flow, avoiding a massive pressure surge to the brain. Also, the neck veins can act as temporary blood storage unit, storing over 1 litre of blood. This prevents blood from flooding the brain and also reduces the amount of blood returning to the heart. As a result, the heart pumps with lower pressure while the head is lowered. This buffers the high head pressure that gravity would otherwise cause. Problem II: When they raise their head up immediately after drinking, blood pressure drops sharply to the brain. A sudden drop could starve the brain of oxygen, causing fainting. This is similar to but much more extreme than the dizziness some people feel when standing up quickly. Solution: When the giraffe raises its head, that stored blood rushes back to the heart quickly. The heart responds with a strong, high-pressure beat that immediately pushes blood back up to the brain, preventing a dangerous drop in cerebral pressure. Impressive right?!
0:15

I love your observation and it will make me discuss the remarkable adaptations that prevents giraffes from passing out and suffering brain damage when bending to drink water and when standing up. ADAPTATION 1 Did you know that the distance from the giraffe's heart to its brain is about 2 meters or more? That's more than the average humans height! Pumping blood up to that great distance and working against gravity is not a joke! That's where the giraffe's heart comes in. A giraffe's heart is unique in several ways. First, it is quite large, weighing up to 11kg and measuring about 2 feet long, which is necessary to pump blood up the long neck to the brain. Second, it has thick walls to generate enough pressure to overcome gravity and push the blood up to the head. ADAPTATION 2 Now, let's move to the neck. Before discussing the incredible roles the valves in the jugular veins perform, let's look at what can happen without them, and then the solution. Problem I: When the giraffe bends down to drink, blood rushes downward to the head. Gravity pulls a huge volume of blood toward the brain, which could cause dangerously high pressure in the head and potentially burst vessels or cause other damage. Solution: They have one-way valves in the jugular veins (the large veins in the neck). These prevent blood from rushing backward uncontrollably into the head when lowered. These valves help regulate and slow the downward flow, avoiding a massive pressure surge to the brain. Also, the neck veins can act as temporary blood storage unit, storing over 1 litre of blood. This prevents blood from flooding the brain and also reduces the amount of blood returning to the heart. As a result, the heart pumps with lower pressure while the head is lowered. This buffers the high head pressure that gravity would otherwise cause. Problem II: When they raise their head up immediately after drinking, blood pressure drops sharply to the brain. A sudden drop could starve the brain of oxygen, causing fainting. This is similar to but much more extreme than the dizziness some people feel when standing up quickly. Solution: When the giraffe raises its head, that stored blood rushes back to the heart quickly. The heart responds with a strong, high-pressure beat that immediately pushes blood back up to the brain, preventing a dangerous drop in cerebral pressure. Impressive right?!

Arojinle

33,422 次观看 • 5 个月前

A loop of AI agents built me a gun. It just can't make it shoot. Day 11 of building GTA 6 with a loop of agents. Yesterday I said today they'd learn to steal cars and shoot. Today's progress: - 2 weapons in - Pickup system works (we can grab weapons now) The downside: you pull the trigger, nothing happens. The loop is incredible at the overall, but shooting is the main part of the game, so I think we wire this one up ourselves. So here is the progress I'm taking shooting and sitting down to learn the physics myself with agent as support. At the same time J A Z I I takes driving by hand. The agents keep doing what they're good at. They're building out the police system and the economy right now, while I type this. Also spent the weekend in SF at a Tripo3D Donut event learning 3D art.
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A loop of AI agents built me a gun. It just can't make it shoot. Day 11 of building GTA 6 with a loop of agents. Yesterday I said today they'd learn to steal cars and shoot. Today's progress: - 2 weapons in - Pickup system works (we can grab weapons now) The downside: you pull the trigger, nothing happens. The loop is incredible at the overall, but shooting is the main part of the game, so I think we wire this one up ourselves. So here is the progress I'm taking shooting and sitting down to learn the physics myself with agent as support. At the same time J A Z I I takes driving by hand. The agents keep doing what they're good at. They're building out the police system and the economy right now, while I type this. Also spent the weekend in SF at a Tripo3D Donut event learning 3D art.

Ziwen

67,385 次观看 • 1 个月前

This is Russiagate summed up in 17 seconds. It’s a complex story with 1000s of moving parts, but at its core it’s very simple. It’s not just that it was all fabricated out of thin air, it’s that the people doing the investigating, charging, and imprisoning knew it was fabricated.
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This is Russiagate summed up in 17 seconds. It’s a complex story with 1000s of moving parts, but at its core it’s very simple. It’s not just that it was all fabricated out of thin air, it’s that the people doing the investigating, charging, and imprisoning knew it was fabricated.

Hans Mahncke

24,001 次观看 • 3 个月前

Horizontal ejections of grey-colored debris appear in videos of the Twin Towers collapses as lateral jets from multiple floors. Official accounts claim these result from air pressure generated by descending sections compressing air and blowing out windows. This explanation cannot hold because the ejections often emerge from levels lower than nearby free-falling debris originating higher in the structure. If progressive collapse advanced solely by gravity-driven impacts, the front of destruction could not precede free-falling material released from above, yet observations show ejections positioned below such debris. This implies the collapse wave descended faster than free-fall permits for loose objects. The grey debris comprises dense pulverized concrete ejected at velocities and distances inconsistent with limited pressure differentials from intact floor air volumes. Air pressure alone would disperse fine dust diffusely rather than propel coherent solid fragments horizontally over tens of meters. Energy calculations based on floor cavity volumes and realistic pressure rises fall short of the kinetic energy required for observed masses and trajectories. These physical mismatches eliminate air pressure from progressive collapse as a viable cause for the horizontal jettisons.
0:16

Horizontal ejections of grey-colored debris appear in videos of the Twin Towers collapses as lateral jets from multiple floors. Official accounts claim these result from air pressure generated by descending sections compressing air and blowing out windows. This explanation cannot hold because the ejections often emerge from levels lower than nearby free-falling debris originating higher in the structure. If progressive collapse advanced solely by gravity-driven impacts, the front of destruction could not precede free-falling material released from above, yet observations show ejections positioned below such debris. This implies the collapse wave descended faster than free-fall permits for loose objects. The grey debris comprises dense pulverized concrete ejected at velocities and distances inconsistent with limited pressure differentials from intact floor air volumes. Air pressure alone would disperse fine dust diffusely rather than propel coherent solid fragments horizontally over tens of meters. Energy calculations based on floor cavity volumes and realistic pressure rises fall short of the kinetic energy required for observed masses and trajectories. These physical mismatches eliminate air pressure from progressive collapse as a viable cause for the horizontal jettisons.

Lampshades

22,357 次观看 • 1 个月前

This looks like a simple transparent shock absorber filled with oil. But what you are seeing is one of the most destructive phenomena in fluid engineering. This is cavitation in its true form. The white cloud forming beneath the piston is not foam and it is not air. The oil is literally changing from liquid to vapour at room temperature. When the piston moves rapidly, the oil is forced through tiny passages inside the damper. The fluid velocity increases, the local pressure drops, and if it falls below the oil's vapour pressure, the liquid begins to boil without any increase in temperature. The moment the pressure recovers, those microscopic vapour bubbles collapse almost instantly. And that is where the real damage begins. The destructive forces of cavitation is really not understood well by most. A collapsing cavitation bubble creates shockwaves and high-speed microjets that strike nearby surfaces with enormous local forces. Repeated millions of times, these tiny implosions can slowly eat away hardened metals, destroy precision components and reduce the lifespan of expensive machinery across industries. This same invisible phenomenon is one of the biggest challenges in naval engineering. Ship propellers operating under enormous loads can suffer cavitation erosion, losing efficiency while creating underwater noise. For advanced stealth submarines, that noise can become a major problem because cavitation can reveal their position. Decades of research have gone into specialised propeller designs, pump-jets, surface finishes and hydrodynamic optimisation to delay its formation. The same issues affects hydroelectric turbines that convert the energy of entire rivers into electricity, and industrial pumps that move oil, chemicals and water through critical infrastructure around the world. Perhaps the most remarkable part is that after 4-5 decades of advances in metallurgy, coatings and manufacturing, engineers still cannot simply build a material that is immune to cavitation. The solution is not to make stronger metals forever. It is to understand the fluid dynamics so precisely that cavitation is prevented before in those destructive bubbles ever form.
0:10

This looks like a simple transparent shock absorber filled with oil. But what you are seeing is one of the most destructive phenomena in fluid engineering. This is cavitation in its true form. The white cloud forming beneath the piston is not foam and it is not air. The oil is literally changing from liquid to vapour at room temperature. When the piston moves rapidly, the oil is forced through tiny passages inside the damper. The fluid velocity increases, the local pressure drops, and if it falls below the oil's vapour pressure, the liquid begins to boil without any increase in temperature. The moment the pressure recovers, those microscopic vapour bubbles collapse almost instantly. And that is where the real damage begins. The destructive forces of cavitation is really not understood well by most. A collapsing cavitation bubble creates shockwaves and high-speed microjets that strike nearby surfaces with enormous local forces. Repeated millions of times, these tiny implosions can slowly eat away hardened metals, destroy precision components and reduce the lifespan of expensive machinery across industries. This same invisible phenomenon is one of the biggest challenges in naval engineering. Ship propellers operating under enormous loads can suffer cavitation erosion, losing efficiency while creating underwater noise. For advanced stealth submarines, that noise can become a major problem because cavitation can reveal their position. Decades of research have gone into specialised propeller designs, pump-jets, surface finishes and hydrodynamic optimisation to delay its formation. The same issues affects hydroelectric turbines that convert the energy of entire rivers into electricity, and industrial pumps that move oil, chemicals and water through critical infrastructure around the world. Perhaps the most remarkable part is that after 4-5 decades of advances in metallurgy, coatings and manufacturing, engineers still cannot simply build a material that is immune to cavitation. The solution is not to make stronger metals forever. It is to understand the fluid dynamics so precisely that cavitation is prevented before in those destructive bubbles ever form.

Ammanichanda

1,187,907 次观看 • 18 天前

A vapor trail that clean only shows up when the round is moving fast through dry air… you might see it a few times in your entire life, and when you do, it tells you the shot was perfect. And if you’re a Democrat, you’ll never understand that this is how real Americans eat… you’ll feel more for the deer than for the families who feed their children with it. So be quiet. 🤫 HK Guns #SilentMajoritySpeaks #AStoneGroove
0:10

A vapor trail that clean only shows up when the round is moving fast through dry air… you might see it a few times in your entire life, and when you do, it tells you the shot was perfect. And if you’re a Democrat, you’ll never understand that this is how real Americans eat… you’ll feel more for the deer than for the families who feed their children with it. So be quiet. 🤫 HK Guns #SilentMajoritySpeaks #AStoneGroove

A Gene Robinson

145,076 次观看 • 8 个月前

Most Tesla owners don’t know this feature exists. You can turn off the passenger-side air vent directly from the touchscreen, giving full individual control over airflow without touching any physical buttons. No manual adjustments or compromises between driver and passenger. It’s just clean digital control so each side gets exactly what it needs. It’s a small quality-of-life detail that makes the minimalist interior work harder than it looks. Tesla replaced traditional vent controls with software, and it’s surprisingly intuitive once you find it. Small feature. Big difference on a long drive.
0:14

Most Tesla owners don’t know this feature exists. You can turn off the passenger-side air vent directly from the touchscreen, giving full individual control over airflow without touching any physical buttons. No manual adjustments or compromises between driver and passenger. It’s just clean digital control so each side gets exactly what it needs. It’s a small quality-of-life detail that makes the minimalist interior work harder than it looks. Tesla replaced traditional vent controls with software, and it’s surprisingly intuitive once you find it. Small feature. Big difference on a long drive.

Adams

49,942 次观看 • 2 个月前