Fox and McDonald's Introduction to Fluid Mechanics
9th Edition
ISBN: 9781118912652
Author: Philip J. Pritchard, John W. Mitchell
Publisher: WILEY
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Textbook Question
Chapter 2, Problem 59P
A shaft with outside diameter of 18 mm turns at 20 revolutions per second inside a stationary journal bearing 60 mm long. A thin film of oil 0.2 mm thick fills the concentric annulus between the shaft and journal. The torque needed to turn the shaft is 0:0036 N · m. Estimate the viscosity of the oil that fills the gap.
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A uniform film of oil 0.13 mm thick separates two disks, each of 200 mm diameter, mounted co-axially. Ignoring edge effects, calculate the torque necessary to rotate one disk relative to the other at a speed of 44 rad/s (7 rev/s) if the oil has a dynamic viscosity of 0.14 Pa s.
A shaft has a diameter of 0.08 m that is pulled at .5 m/s in a bearing sleeve .0803 m in diameter having a length of 36 m. A free space is filled with oil at 20oC with kinematic viscosity of 50 cm2 /s and SG = 0.9. Calculate the force exerted by the oil in the shaft
A shaft 70-mm in diameter is being pushed at a speed of 400mm/s through a bearing sleeve 70.2-mm in diameter and 250mm long. The clearance is filled with oil with a kinematic viscosity of v = 0.005 m²/s and SG-0.9.
A. Find the frictional resistance exerted by the oil on the shaft in Newtons (N).
B. If the shaft in the problem above is fixed axially and rotated inside the sleeve at 2000 rpm, determine the resisting torque exerted by the oil and the power required to rotate the shaft in kilowatts (kW).
Chapter 2 Solutions
Fox and McDonald's Introduction to Fluid Mechanics
Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - For the velocity fields given below, determine:...Ch. 2 - A viscous liquid is sheared between two parallel...Ch. 2 - For the velocity field V=Ax2yi+Bxy2j, where A = 2...Ch. 2 - A fluid flow has the following velocity...Ch. 2 - When an incompressible, nonviscous fluid flows...Ch. 2 - For the free vortex flow the velocities are t =...Ch. 2 - For the forced vortex flow the velocities are t =...Ch. 2 - A velocity field is specified as V=axyi+by2j,...Ch. 2 - A velocity field is given by V=ax3i+bxy3j, where a...
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