Nukit

@NukitToBeSure • 8,377 subscribers

Nukit at https://t.co/62nBfO0NBA (Call us "Nukit" please, other names may cause difficulty🙇🏻‍♀️)

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The very first batch of Nukit Lanterns off the line this month went to protect the workers themselves. We now have Far-UVC in all working and common areas. Nukit is the first company in the world to protect its workers first- so they can protect you, with safe, effective, 222nm Far-UVC light.

The very first batch of Nukit Lanterns off the line this month went to protect the workers themselves. We now have Far-UVC in all working and common areas. Nukit is the first company in the world to protect its workers first- so they can protect you, with safe, effective, 222nm Far-UVC light.

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Not only does current evidence suggest the downward ballistic-arc droplet infection model is wrong, but a large portion of exhaled bioaerosols don't just drift laterally; they actually rise on the thermal plume of warm exhaled air and body heat, then fall back into the breathing zone as they cool. This is one of the factors that extends the infectious range of bioaerosols more than intuition might indicate.

Not only does current evidence suggest the downward ballistic-arc droplet infection model is wrong, but a large portion of exhaled bioaerosols don't just drift laterally; they actually rise on the thermal plume of warm exhaled air and body heat, then fall back into the breathing zone as they cool. This is one of the factors that extends the infectious range of bioaerosols more than intuition might indicate.

199,526 просмотров • 3 месяцев назад

This is the reality of modeling aerosols all day🤢 It's just a lot nicer not to think about that, or be like..."nah all the bioaerosols kind of just die on their own in the few seconds between when they are exhaled by someone else and I inhale them..." Because otherwise?🤮

This is the reality of modeling aerosols all day🤢 It's just a lot nicer not to think about that, or be like..."nah all the bioaerosols kind of just die on their own in the few seconds between when they are exhaled by someone else and I inhale them..." Because otherwise?🤮

51,316 просмотров • 3 месяцев назад

Unfortunately, "protective bubbles" are almost entirely a marketing myth. Where you place an air purifier in a room in relation to yourself has almost no effect on how much protection it grants you. Air is a fluid, and fluids mix constantly with the slightest movement. It's like trying to make a "cream only" bubble in your coffee while you're stirring. Only in a room, people are the spoon. This is easy to verify with even a cheap particle counter. Take a measurement with an air purifier across the room, take a measurement with it next to you- it will be almost identical. The measurement will remain almost identical until you are a few centimeters from the air purifier's output. People feel a breeze from a purifier blowing on their face, so they think they are protected, but with the exception of some very specialized units like the Air Fanta Wear, there is almost no localized effect- it's all CADR per room, not CADR per cm away from you. Here's a CFD model with an air purifier in various locations and the relation to particle count in the breathing box (inhalation zone) of a room occupant. In short, it doesn't matter if you have a lot of CADR close to the performer, just how many CADR in the room. Big air purifiers on stage are mostly for feels and vibes. The data just does not support it. It's too much air, mixing too quickly for a localized effect. A particle counter near the performer and in the audience will show almost the same number.

Unfortunately, "protective bubbles" are almost entirely a marketing myth. Where you place an air purifier in a room in relation to yourself has almost no effect on how much protection it grants you. Air is a fluid, and fluids mix constantly with the slightest movement. It's like trying to make a "cream only" bubble in your coffee while you're stirring. Only in a room, people are the spoon. This is easy to verify with even a cheap particle counter. Take a measurement with an air purifier across the room, take a measurement with it next to you- it will be almost identical. The measurement will remain almost identical until you are a few centimeters from the air purifier's output. People feel a breeze from a purifier blowing on their face, so they think they are protected, but with the exception of some very specialized units like the Air Fanta Wear, there is almost no localized effect- it's all CADR per room, not CADR per cm away from you. Here's a CFD model with an air purifier in various locations and the relation to particle count in the breathing box (inhalation zone) of a room occupant. In short, it doesn't matter if you have a lot of CADR close to the performer, just how many CADR in the room. Big air purifiers on stage are mostly for feels and vibes. The data just does not support it. It's too much air, mixing too quickly for a localized effect. A particle counter near the performer and in the audience will show almost the same number.

13,427 просмотров • 1 месяц назад

Bit of fun, decided to check mask straps on my tensile strength testing machine (as one does💅🏻). Single strap attachment point load limit: 3M VFlex 9105: 1,564g Zhou Liang's mask ZM9541: 2,421g Zhou Liang's mask claimed 40n (4kg) across the whole strap (both points) so they overshot by a nice margin. That's a ton of weight on a little bit of meltblown. Any strap detachment must be some really interesting lateral loading problem with the ultrasonic welds or something like that🤔 I'm sure they'll track it down.

Bit of fun, decided to check mask straps on my tensile strength testing machine (as one does💅🏻). Single strap attachment point load limit: 3M VFlex 9105: 1,564g Zhou Liang's mask ZM9541: 2,421g Zhou Liang's mask claimed 40n (4kg) across the whole strap (both points) so they overshot by a nice margin. That's a ton of weight on a little bit of meltblown. Any strap detachment must be some really interesting lateral loading problem with the ultrasonic welds or something like that🤔 I'm sure they'll track it down.

21,004 просмотров • 8 месяцев назад

This is a demo of our new thermal plume simulation that we're incorporating into all of Nukit's CFD aerosol modeling. With the current pathogen chamber tests that Nukit obtains from third-party labs, we measure how well Far-UVC removes bioaerosols that are introduced into the chamber through a port in the wall. This is a good measure of overall effectiveness, and all our Far-UVC products are validated in this way and the data provided to the public on our site - (we are, so far, the only company willing to put our money where our mouth is in this way). The only problem with this testing method, is that it does not test one of the main strengths of Far-UVC- the ability to mitigate near-field transmission- the transmission of pathogens that occurs at close range between individuals. This is where computational fluid dynamics (CFD) modeling comes in. The same powerful software that is used to model the flow of air (a fluid) to make sure an airplane design will fly before it's even been built, can model the air we exhale and how it will respond to Far-UVC with similar accuracy- if it's given enough data to work with. One of the trickier things to calculate with this kind of modeling is the human thermal plume- how the air we exhale rises and then falls as it cools, and how the heat our bodies emit pulls air- and any suspended aerosols, upward. Knowing how the air we exhale moves before it's inevitably inhaled by someone else lets us figure out how much Far-UVC we need to inactivate the pathogens that air contains before it's inhaled, and how that Far-UVC should be arranged. One popular method of implementing Far-UVC is with downlights. The idea is that the vertical cones of light would interrupt the exhalation passing horizontally between individuals. But, if the exhalation is not strictly lateral, if most of it is rising first on a thermal plume, it might miss a few staggered vertical cones of Far-UVC, and having emitters in the corners, pointed slightly horizontally to cover a broad area and more of the upper room, might inactivate pathogens as they rise before they cool and fall- a bit like Upper-Room GUV but lower. The next step will be to model this with a number of “breathing” figures, sitting and standing, and seeing, with the same total Far-UVC wattage, what arrangement of emitters results in the lowest inhalation of exhaled active bioaerosols. This model shows: - No ventilation (0 ACH, it will be 3 ACH in the actual model) - Air temperature: 25 C - Skin temperature: 34 C - Nostril temperature: 36 C If you’d like to read more about human thermal plumes and their role in how bioaerosols propagate, see: Nukit Torches are no longer sold- we will still honor warranties on them. The Torch 2 will be available in the next 60 days or so. It is more powerful, lower cost per watt, and has replaceable emitters and batteries. For US residents we currently have a limited number of Nukit Lanterns in stock in our US warehouse, that are tariff free. This may be the last chance to obtain them without tariffs. Outside of the US you can buy them here: A small number of this batch of Lanterns have defective buttons. If you have any issues, please contact us. Our apologies; we are trying very hard to make Far-UVC affordable for everyone, and patient, understanding early adopters help make that happen. We do not check this account often, if you have any questions about Far-UVC kindly contact us through our website.

This is a demo of our new thermal plume simulation that we're incorporating into all of Nukit's CFD aerosol modeling. With the current pathogen chamber tests that Nukit obtains from third-party labs, we measure how well Far-UVC removes bioaerosols that are introduced into the chamber through a port in the wall. This is a good measure of overall effectiveness, and all our Far-UVC products are validated in this way and the data provided to the public on our site - (we are, so far, the only company willing to put our money where our mouth is in this way). The only problem with this testing method, is that it does not test one of the main strengths of Far-UVC- the ability to mitigate near-field transmission- the transmission of pathogens that occurs at close range between individuals. This is where computational fluid dynamics (CFD) modeling comes in. The same powerful software that is used to model the flow of air (a fluid) to make sure an airplane design will fly before it's even been built, can model the air we exhale and how it will respond to Far-UVC with similar accuracy- if it's given enough data to work with. One of the trickier things to calculate with this kind of modeling is the human thermal plume- how the air we exhale rises and then falls as it cools, and how the heat our bodies emit pulls air- and any suspended aerosols, upward. Knowing how the air we exhale moves before it's inevitably inhaled by someone else lets us figure out how much Far-UVC we need to inactivate the pathogens that air contains before it's inhaled, and how that Far-UVC should be arranged. One popular method of implementing Far-UVC is with downlights. The idea is that the vertical cones of light would interrupt the exhalation passing horizontally between individuals. But, if the exhalation is not strictly lateral, if most of it is rising first on a thermal plume, it might miss a few staggered vertical cones of Far-UVC, and having emitters in the corners, pointed slightly horizontally to cover a broad area and more of the upper room, might inactivate pathogens as they rise before they cool and fall- a bit like Upper-Room GUV but lower. The next step will be to model this with a number of “breathing” figures, sitting and standing, and seeing, with the same total Far-UVC wattage, what arrangement of emitters results in the lowest inhalation of exhaled active bioaerosols. This model shows: - No ventilation (0 ACH, it will be 3 ACH in the actual model) - Air temperature: 25 C - Skin temperature: 34 C - Nostril temperature: 36 C If you’d like to read more about human thermal plumes and their role in how bioaerosols propagate, see: Nukit Torches are no longer sold- we will still honor warranties on them. The Torch 2 will be available in the next 60 days or so. It is more powerful, lower cost per watt, and has replaceable emitters and batteries. For US residents we currently have a limited number of Nukit Lanterns in stock in our US warehouse, that are tariff free. This may be the last chance to obtain them without tariffs. Outside of the US you can buy them here: A small number of this batch of Lanterns have defective buttons. If you have any issues, please contact us. Our apologies; we are trying very hard to make Far-UVC affordable for everyone, and patient, understanding early adopters help make that happen. We do not check this account often, if you have any questions about Far-UVC kindly contact us through our website.

15,106 просмотров • 1 год назад

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