Problem 2.56 - Problem 2.56 Given Flow between two plates...

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Problem 2.56 [Difficulty: 2] Given: Flow between two plates Find: Force to move upper plate; Interface velocity Solution: The shear stress is the same throughout (the velocity gradients are linear, and the stresses in the fluid at the interface must be equal and opposite). Hence τμ 1 du 1 dy = μ 2 du 2 dy = or μ 1 V i h 1 μ 2 VV i () h 2 = where V i is the interface velocity
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