Quote:
Originally Posted by freebeard
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I think this is a 'prank', perpetrated by someone with a greatest sense of humor, perhaps only just to see if those out in the community who are 'looking' can still fog a mirror.
It's immediately 'stupid', and any 8th-grader in algebra class would pick up on its bogusness 'hiding in plain sight.'
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'Reynolds number' ( Rn ) is the product of a vehicle's length, multiplied by it's velocity, with the product divided by the air's kinematic viscosity.
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Rn times kinematic viscosity = Length X velocity
--------------------------------------------------------------------------------------Rn X kinematic viscosity / length = velocity
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1) We're given some Rn 25,000 and Rn 3,500
2) An 18-wheel, conventional tractor/semi-trailer has a length of 74.35-feet.
3) The kinematic viscosity of SAE International 'Standard Air' is 1.578 X 10-to-the negative 4th power, or, 0.0001578.
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I won't spoil the fun by giving the computational results.
Solve for velocity, in feet per second.
Then, convert to miles per hour.
You'll be astounded by the absurdity of any notion of the viability of DBD plasma actuators.
Truly 'Unicorn Corral' material.
