Laminar flow from draining the pool

Oh god! I remember that FLUID MECHANICS subject from engineering days 😅..these laminar and turbulent flow made my life hell back then😂

Osborne Reynolds ran water through a one-inch glass tube with a trumpet mouth in a six-foot tank and on 22 February 1880 the dye streak stayed a straight filament until, at about two feet per second, it burst into eddies.

A little colored ink on the upstream would have given a nice verification

Looks like a solid piece of glass until you touch it.

@grok what is the name of this

I got through the rough patch and found a little daylight. The joy has a little history behind it.

Looks like a glass rod until you break the surface

Wow. Very interesting

层流看起来像一根会动的玻璃棒，太漂亮了。排水口附近雷诺数低，所以水流能保持这么干净的分层，再往下就慢慢开始破碎。流体力学里最直观的演示之一。

How is that possible

most satisfying video ✨

What's the big deal; men have being this every morning since Jesus played Full-back for Jerusalem. 🤣🇭🇲