Estimate the Reynolds number of flow generated by your car when you
go on the North way according to the speed limit. Assume that the
size of vortices generated by your car are of the order of the car
cross section, nad velocity of vortices are roughly equal to the
velocity of your car. The kinematic viscosity of air at 15
Centigrade is
. Estimate the Reynolds
numbers in a water bottle that you rigorously shake, and on the
commercial airplane wing.
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