Evaluation of Frictional Heat Generated in a Mechanical Contact due to Debris Formation and the Cooling Rates of some Lubricating Oils

Author(s)

Abstract
AbstractIn this study, a test rig was set up to experimentally evaluate the amount of frictional heat generated in a Mitsubishi main journal bearing and the cooling performance of some lubricating oils. The test rig used in this experiment is a mechanical apparatus that consists of mechanical drive, metal support, bevel gear, a rotating shaft and a bearing attached at its lower end. When the shaft was rotated by the mechanical drive of power 0.75kw, the frictional force in journal bearing helped to convert the mechanical energy of the drive into frictional heat. The amount of heat absorbed from the surface of the journal bearing by the oil cooled the surface. The cooling rate of oil was obtained at each time interval. The vibrational movement of molecules helped to transfer the frictional heat to the lubricant and the calorimeter. This effect caused the temperature of the system to rise and it was measured and recorded. The frictional heat generated in the contact increased linearly with the change in temperature in the mechanical contact which was absorbed differently in the three lubes, depending on their heat capacity and molecular movement. When there was no debris in the contact, the temperature changed within the range of 1.2-1.80C at interval of 3minutes in oil ‘B’, 10C in oil ‘C’ and 0.8-1.20C in oil ‘A’. When there was sand debris in the contact, the temperature changed within the range of 2-2.50C at interval of 3minutes in oil ‘B’, 1.5-20C in oil ‘C’ and 20C in oil ‘A’. Oil ‘B’ has the best cooling performance based on the three lubricants used.

Keywords
Key Words: Lubricant, Mechanical contact, Frictional heat, Cooling rate, Debris.

Cite this paper
Achebe C.H., Nwagu A.I., Anosike B.N., Evaluation of Frictional Heat Generated in a Mechanical Contact due to Debris Formation and the Cooling Rates of some Lubricating Oils , SCIREA Journal of Mechanical Engineering. Volume 1, Issue 1, October 2016 | PP. 12-32.

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