Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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A Study on the Changes in Dielectric Constant of Engine Oil

엔진오일의 유전상수 변화에 관한 연구

  • 전상명 (호서대학교 자동차공학과)
  • Published : 2006.04.01
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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 $100^{\circ}C$.

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References

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