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

Volume 1, Issue 1, October 2016     |     PP. 12-32      |     PDF (739 K)    |     Pub. Date: October 20, 2016
DOI:    439 Downloads     8035 Views  

Author(s)

Achebe C.H., Department of Mechanical Engineering, Nnamdi Azikiwe University Awka
Nwagu A.I., Department of Mechanical Engineering, Nnamdi Azikiwe University Awka
Anosike B.N., Department of Mechanical Engineering, Nnamdi Azikiwe University Awka

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.

References

[ 1 ] Bose, B. K., Bijan, Sarker and Swarup Paul, (2009), Effect of continuous operation on wear characteristics of some components of a Diesel Engine Run by Alternative fuels, Journal of Tribology, 2(3): 1–10.
[ 2 ] Carter, G. (1993), Tribology, Published by Macmillan Education, Loughborough University of Technology, Engineering Science Project, (3): 20–25.
[ 3 ] Dwyer, Joyce, R. S., and Heymer, J. (1996), The entrainment of solid particles into rolling Elastohydrodynamic contact, ASME Journal of tribology, 3(124): 420.
[ 4 ] Gavrilov, V., Khlevnoy, B., Otryaskin, D. and Sapritsky, V.I. (2013), Measurement of Thermodynamic Temperature of High Temperature Fixed Points, Journal of Thermometry, 12(1): 50–70.
[ 5 ] Khurmi, R. S., and Gupta, J. K., (2012), Machine Design, Fourteenth Edition, Published by Eurasia Publishing House (p) ltd, 7361, Ram Nagar, New Delhi (8): 978–980.
[ 6 ] Lalit, T., and Navneet, A. (2012), Sliding and abrasive wear behavior of W.C. Cocr coatings with different carbide sizes, Journal of Material Engineering and Performance, 22 (2): 574–583.
[ 7 ] Macek, J. and Emrich, M. (2011), A simple physical model of ICT mechanical losses, Journal of Tribology, (12): 1–25.
[ 8 ] Moon, M. (2007), Gear solution, Journal of tribology, (18): 574–588.
[ 9 ] Osei, Y. A., Akpanisi, L. E. S., and Igwe, H. (2011), New School Chemistry, Sixth Edition, Published by African First Publishers plc, Africana First Drive P. M. B. 1639, Onitsha, Nigeria, (8): 436–439.
[ 10 ] Prakash, C.T. and Kirti, S. (2014), Aerogels as Promising Thermal Insulating Materials, Journal of Material, 12(1): 1–10.
[ 11 ] Sander, J. (2012), When Do Synthetic Lubricants Make Sense, Journal of Lubrication, 2(20): 1–8.
[ 12 ] Udonne, J.D. (2011), A comparatve Study of Recycling of used Lubrication Oils using Distillation, Acid and Activated Charcoal with Clay Methods, Journal of Tribology, 2(2): 12–19.