me320-hwk9-slns - The University of Michigan Department of...

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Unformatted text preview: The University of Michigan Department of Mechanical Engineering ME 320 - Sections 1 & 2 Homework #9 - Due November 23, 2011 Problem 1: A simplified form of the stepped thrust bearing consists of a stationary plate held parallel to a moving surface as shown. The plate has a step that prevents flow through the gap. The height of the gap is h , and the width of the bearing is w . The fluid is of density and viscosity and the flow is fully laminar. The velocity of the moving surface is V o . (i) Calculate the load F supported by the bearing in terms of ,V o , l , h . (ii) Calculate the ratio of the drag force D on the moving surface to the load F . (iii) 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 F (specific gravity =0 . 85), calculate F and D/F . Problem 2: A stepped bearing is shown in the figure. The lower plate moves with respect to the bearing shoe and drags oil through the clearance space. The bearing is of infinite extent normal to the page, and all values are to be computed per unit width. Assume laminarextent normal to the page, and all values are to be computed per unit width....
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me320-hwk9-slns - The University of Michigan Department of...

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