hw8_sol - plate held parallel to a moving surface as shown....

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The University of Michigan Department of Mechanical Engineering ME 320 - Section 1 Homework #8 - Due November 12, 2008 Problem 1: Problems 6.76 and 6.81 of the text. Problem 2: Problems 6.94 and 6.95 of the text. Problem 3: Problems 6.93 and 6.101 of the text. Problem 4: A common type of viscometer for liquids consists of a relatively large reservoir with a very slender outlet tube, the rate of outFow being determined by timing the fall in the surface level. If oil of constant density Fows out of the viscometer shown at the rate of 5 × 10 - 7 m 3 /s , what is the kinematic viscosity of the Fuid? Assume laminar, quasi-steady Fow. Problem 5: A simpli±ed form of the stepped thrust bearing consists of a stationary
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Unformatted text preview: plate held parallel to a moving surface as shown. The plate has a step that prevents Fow through the gap. The height of the gap is h , and the width of the bearing is w . The Fuid is of density and viscosity and the Fow is fully laminar. The velocity of the moving surface is V o . (a) Calculate the load F supported by the bearing in terms of , V o , l , h . (b) Calculate the ratio of the drag force D on the moving surface to the load F . (c) If V o = 20 ft/sec., h = 10-3 ft., l = 0 . 5 ft and we use SAE 30 oil at a temperature of 150 o (specic gravity =0 . 85), calculate F and D/F ....
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hw8_sol - plate held parallel to a moving surface as shown....

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