Quiz11 - 57:020 Mechanics of Fluids and Transport December...

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Unformatted text preview: 57:020 Mechanics of Fluids and Transport December 3, 2010 NAME Fluids-ID Quiz 11. Air at 20C and 1 atm ( = 1.2 kg/m3 and = 1.8 10-5 kg/m-s) flows at U = 3 m/s past a sharp flat plate of width b = 2 m and length L = 1 m. (a) Is the flow laminar or turbulent? (b) What is the local wall shear stress w at the end of the plate? (c) What is the total friction drag Df on both sides of the plate? (Use Recr = 5 105) Local friction coefficient: Friction drag coefficient: Solution: (a) Check the Reynolds number to see if the flow is laminar or turbulent: (+2 points) (b) With Rex = ReL = 2 105 at x = L, (+4 points) (b) Compute the drag for both sides of the plate, A = 2bL: (+4 points) ...
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This note was uploaded on 12/08/2011 for the course MECHANICS 57:020 taught by Professor Fredrickstern during the Fall '10 term at University of Iowa.

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