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http://dx.doi.org/10.9725/kstle.2006.22.2.099

A Study on the Changes in Dielectric Constant of Engine Oil  

Chun Sang-Myung (Dept. of Automotive Engineering, Hoseo University)
Publication Information
Tribology and Lubricants / v.22, no.2, 2006 , pp. 99-104 More about this Journal
Abstract
The dielectric constants of fresh engine oils were obtained according to various types of oil, temperatures and frequencies. Through analyzing the characteristics of dielectric constant, the related correlation between the changes in dielectric constant of oil and the degree of oil deterioration is going to be found. The dielectric constant was calculated by cross capacitances measured by a sensor tube. Before finding the correlation, as a prerequisites study, the best condition measuring the dielectric constant was found. In general, it was found that the value of dielectric constant became stable below $60^{\circ}C$ regardless frequency variation. Further, above 6kHz, the dielectric constant became stable even if temperature had been above $100^{\circ}C$.
Keywords
engine oil; oil deterioration; dielectric constant; capacitance;
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