Problem 5.91

# Problem 5.91 - Problem 5.91 Given: Find: [Difficulty: 2]...

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Problem 5.91 [Difficulty: 2] Given: Sinusoidal approximation for velocity profile in laminar boundary layer F vmax 1.851 kN m 3 Find: (a) Express shear force per unit volume in the x-direction (b) Maximum value at these conditions Solution: We will evaluate a differential volume of fluid in this flow field Assumptions: (1) Steady flow The differential of shear force would be: dF shear τ d τ () d x dz τ dx dz d τ dx dz and dF sx dV d τ dy y μ du dy d d μ 2 y u d d 2 From the given profile: y u d d π U 2 δ cos π y 2 δ and 2 y u d d 2 U π 2 δ 2

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## Problem 5.91 - Problem 5.91 Given: Find: [Difficulty: 2]...

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