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viscous drag

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viscous drag [′vis·kəs ′drag]
(fluid mechanics)
That part of the rearward force on an aircraft that results from the aircraft carrying air forward with it through viscous adherence.


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Physically, Re represents the ratio of the fluid inertia impinging on the moving substrate to the viscous drag force to pull the coating solution.
Compared to a knife, a wire accepts some increase in pressure drag in order to achieve a massive reduction in wetted area and thus viscous drag.
For groove inclination, angle [theta] is measured from a vertical line and the viscous drag velocity due to the shaft rotation is [u.
 
 
 
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