The device shown consists of a disk that is rotated by a shaft. The disk is positioned

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The device shown consists of a disk that is rotated by a shaft. The disk is positioned very close to a solid boundary. Between the disk and the boundary is viscous oil.

a. If the disk is rotated at a rate of 1 rad/s, what will be the ratio of the shear stress in the oil at r = 2 cm to the shear stress at r = 3 cm?

b. If the rate of rotation is 2 rad/s, what is the speed of the oil in contact with the disk at r = 3 cm?

c. If the oil viscosity is 0.01 N∙s/m² and the spacing y is 2 mm, what is the shear stress for the conditions noted in part (b)?

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Engineering Fluid Mechanics

ISBN: 9781118880685

11th Edition

Authors: Donald F. Elger, Barbara A. LeBret, Clayton T. Crowe, John A. Robertson

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Question Posted: Jun 16, 2021 04:16 AM

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The device shown consists of a disk that is rotated by a shaft. The disk is positioned

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Disk Oil D

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aRatio of Shear stresses dVdy r y 2 ...View the full answer

Engineering Fluid Mechanics

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