Online ISSN : 2189-9967
Print ISSN : 0915-1168
ISSN-L : 0915-1168
Volume 65 , Issue 1
Special Issue on Recent Trends in Tribology Field Led by Technical Committees in JAST
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Special Issue on Recent Trends in Tribology Field Led by Technical Committees in JAST
Lecture Lecture of Tribology
Essay The Tribo-Soshi, Essays from Tribologists
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Original Contribution on Science
  • ―Proposal of Liquid State Equation and Estimation of High Pressure Density―
    Masato KANEKO
    2020 Volume 65 Issue 1 Pages 45-60
    Published: January 15, 2020
    Released: January 15, 2020
    [Advance publication] Released: November 19, 2019
    Supplementary material

    The physical properties of lubricant under high temperature and high pressure include high pressure viscosity, high pressure density, bulk modulus, coefficient of thermal expansion, etc. It is important to know these high pressure physical properties in machine design. However, almost no discussion has been made on the liquid state equation, which is the basis of the high pressure physical properties of these lubricants. Therefore, in this report, using the high pressure density measuring device, the volume was obtained from the measurement of the density at each temperature and pressure, and the PVT relational equation was derived. Further, Vt=0 (absolute zero degree volume), RL (liquid constant), PR (correction pressure for the pressure decrease due to liquid intermolecular force) included in this equation are liquid specific constants. This equation is consistent with the ideal liquid state equation derived from thought experiments, and it was found that this equation could be utilized as a liquid state equation of high utility. In addition, we can estimate the high pressure density which is one of the high pressure physical properties of the lubricant by this liquid state equation.

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