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Experimental determination of heat partition in elastohydrodynamic contacts

Al-Hamood, Amjad, Clarke, Alastair and Evans, Henry Peredur 2014. Experimental determination of heat partition in elastohydrodynamic contacts. Presented at: 41st Leeds-Lyon Symposium on Tribology - Integrated Tribology, Leeds, England, 2-5 September 2014.

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Abstract

Experimental and theoretical analyses are reported to study the heat generation and partition in an elastohydrodynamic rolling/sliding point contact. Heat is generated within the lubricant in the Hertzian region by shearing and compression of the oil film. This heat is essentially conducted to the contacting surfaces as the amount convected from the Hertzian zone by the lubricant can be neglected due to the very low lubricant mass flowrate. A two-disk test rig was used for the experimental tests using crowned, superfinished 76.2 mm diameter disks fixed on parallel shafts. The disks was fitted with six thermocouples in two rows of three located 3 mm and 6 mm below the surface to measure the temperature distribution of the disks during the tests. In addition, the disks were insulated on both plane sides by ceramic washers to minimise heat transfer to the surroundings over those surfaces. A numerical model was developed to calculate the circumferential mean disk temperature variation in the outer 6 mm annular ring. The model was used to predict the temperature distribution for given values of the fraction of the total heat entering the fast disk, , and the heat transfer coefficient, h, for the disk running surfaces. These transient temperature solutions for specified values of  and h were compared with the recorded outer thermocouple temperatures to give a measure of error between the calculated and observed distributions. Error contours then show that the minimum error lies on a straight line in the (, h) plane so that  is essentially linearly related to hf for the error to be minimised. A similar relationship for the slow disk allows the value of  to be obtained for a given ratio hf /hs. Values of hf /hs obtained from the literature suggest that  lies in the range 0.65 to 0.78 for the experiments reported in the paper.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Last Modified: 17 Jun 2017 10:07
URI: http://orca-mwe.cf.ac.uk/id/eprint/67665

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