A 6 cm diameter shaft rotates at 3000 rpm in a 20 cm long bearing with a uniform play of 0.2 mm. Under stable operating conditions, both the bearing and the shaft in the vicinity of the oil gap are at 50 ° C, and the viscosity and thermal conductivity of the lubricating oil are 0.05 Ns / m 2 and 0.17 W / mK. Simplifying and solving the equations for continuity, momentum, and energy, determine (a) the maximum oil temperature, (b) the rates of heat transfer to the bearing and shaft, and (c) the mechanical power wasted by viscous dissipation in Oil. Answers: (a) 53.3 ° C, (b) 419 W, (c) 838 W
A 6 cm diameter shaft rotates at 3000 rpm in a 20 cm long bearing with a uniform play of 0.2 mm. Under stable operating conditions, both the bearing and the shaft in the vicinity of the oil gap are at 50 ° C, and the viscosity and thermal conductivity of the lubricating oil are 0.05 Ns / m 2 and 0.17 W / mK. Simplifying and solving the equations for continuity, momentum, and energy, determine (a) the maximum oil temperature, (b) the rates of heat transfer to the bearing and shaft, and (c) the mechanical power wasted by viscous dissipation in Oil. Answers: (a) 53.3 ° C, (b) 419 W, (c) 838 W
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter1: Heat, Temperature, And Pressure
Section: Chapter Questions
Problem 17RQ: Convert 22C to Fahrenheit.
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A 6 cm diameter shaft rotates at 3000 rpm in a 20 cm long bearing with a uniform play of 0.2 mm. Under stable operating conditions, both the bearing and the shaft in the vicinity of the oil gap are at 50 ° C, and the viscosity and thermal conductivity of the lubricating oil are 0.05 Ns / m 2 and 0.17 W / mK. Simplifying and solving the equations for continuity, momentum, and energy, determine (a) the maximum oil temperature, (b) the rates of heat transfer to the bearing and shaft, and (c) the mechanical power wasted by viscous dissipation in Oil. Answers: (a) 53.3 ° C, (b) 419 W, (c) 838 W
Transcribed Image Text:3000 грm
6 ст
20 ст
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