Terminal velocity (THIS IS A TROLL THREAD)
If a tear drop is such a great aerodynamic shape:
Why does the rain drop have a terminal velocity of only 25f/s, compared to the outstretched human, with a tV of ~250f/s?! Checkmate, aerodynamicists!:cool: |
Density?
How about a thinner human will have a higher percentage of his weight made up of dense things like bone and muscle. Less surface area than water for a given amount of mass. Tubby McLardbutt will have a density more closely approaching that of water and will have a lot more surface area to act as a brake on his form, bringing him closer to the speed of a raindrop? |
1. Raindrops aren't "teardrop shaped," they're roughly spherical.
2. Raindrops fall slowly due to the "square/cube rule": as you scale up a design (like a raindrop) the force of gravity goes up by the cube, but drag is roughly proportionate to frontal area, and goes up by the square (ignoring Reynold's number.) A teardrop probably falls faster than a teardrop-sized person would. |
Partly because rain drops aren't actually teardrop shaped. :P
EDIT: Beat me by 2 minutes, meanjoe75fan! |
...don't falling raindrops look more like blood platelets, ie: semi squished / flattened in their vertical plane due to air pressure against the center of its originally spherical shape?
...or, maybe, more like a clear Hersey "Kisses" chocolate drop falling with its "flat" bottom facing downward? |
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-m |
teardrop
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*rain drops alter their form continuously as they fall,as they are a deformable structure,yielding instantaneously to any stressor. *A raindrops terminal velocity is meaningless unless its mass and time-averaged mean frontal area was specified as well as Reynolds number Same for human. *The 'teardrop' is used in reference to streamline bodies of revolution of blunt nose and tapering tail. *Streamline bodies are given the term due to the fact that they are 'streamlined',having no separated flow,and no appreciable turbulent wake.They are the lowest drag form for any structure tested. |
I really tried to make it obvious with the "check mate" comment, but you guys are really easy to troll... LOL.
Thanks for making me giggle, though. It's been a long week. :) |
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I've got a good one: what's the difference between a tear dropped car and a fish shaped car without any fins?
And as a side note: its nice to see efficiency working superbly in nature with the low drag flow throughout the body of a fish with its beautifully tapered body (like the marlin). |
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