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A. SUZUKI,M. MASUKO 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.2002 No.10
The dielectric permittance and the dielectric loss factor of several lubricating oils were measured at frequencies from 100 ㎐ to 1.5 ㎒. The measurements were carried out under atmospheric pressure as a function of temperature and under fixed temperature as a function of pressure. Temperature and pressure dependence of dielectric relaxation time were investigated. The temperature dependence of relaxation time obeyed the Vogel-Fulcher-Tammann (VFT) law. We modified the VFT equation in order to express the dielectric relaxation time as a function of temperature and pressure. Furthermore, by taking into consideration the similarity of the temperature and pressure dependence between dielectric relaxation and mechanical relaxation, the prediction of high-pressure viscosity were conducted. The predicted results were compared with the viscosity data obtained from the falling-sphere type viscometer.