ME309_Fall11_HW12_soln

# ME309_Fall11_HW12_soln - U = 20 m/s? c. Ignoring the...

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Problem 3 A small bug rests on the outside of a car side window as shown in the figure below. The surrounding air has a density of 1.2 kg/m 3 and kinematic viscosity of 1.5*10 -5 m 2 /s. To first order, we can approximate the flow as flat plate flow with no pressure gradient and the start of the boundary layer begins at the leading edge of the window. a. Determine the minimum speed at which the bug will be sheared off of the car window if the bug can resist a shear stress of up to 1 N/m 2 . b. What is the total skin friction drag acting on the window at a speed of

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Unformatted text preview: U = 20 m/s? c. Ignoring the presence of the bug, at what streamwise location will the boundary layer separation point occur on the window? Justify your answer. Problem 5 A vertical stabilizing fin on a land-speed-record car is 1.65 m long and 0.785 m tall. The automobile is to be driven at the Bonneville Salt Flats in Utah, where the elevation is 1340 m and the summer temperature reaches 50 degC. The car speed is 560 km/hr. Calculate the power required to overcome skin friction drag on the fin....
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## This note was uploaded on 02/13/2012 for the course ME 309 taught by Professor Merkle during the Fall '08 term at Purdue.

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ME309_Fall11_HW12_soln - U = 20 m/s? c. Ignoring the...

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