A laminar flow occurs between two horizontal parallel plates under a pressure gradient dp/ds (dp/ds is a
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A laminar flow occurs between two horizontal parallel plates under a pressure gradient dp/ds (dp/ds is a constant and the sign of dp/ds is negative.). The upper plate moves left with a speed ut. The expression for local velocity u is given as
a. Is the magnitude of the shear stress greater at the moving plate (y = H) or at the stationary plate (y = 0)?
b. Derive an expression for the y position of zero shear stress.
c. Derive an expression for the plate speed ut required to make the shear stress zero at y = 0.
Transcribed Image Text:
1 dp -(Hy – y') – u, u = 2µ ds H
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Related Book For
Engineering Fluid Mechanics
ISBN: 9781118880685
11th Edition
Authors: Donald F. Elger, Barbara A. LeBret, Clayton T. Crowe, John A. Robertson
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