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Unformatted text preview: 57:020 Mechanics of Fluids and Transport
December 3, 2010 NAME
FluidsID
Quiz 11. Air at 20C and 1 atm ( = 1.2 kg/m3 and = 1.8 105 kg/ms) 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.
 Fall '10
 FredrickStern
 mechanics

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