Derivation of van der Waals Type Liquid Density Equation and Estimation of High Pressure Density of Lubricants

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  • Kaneko Masato
    Lubricants Productive Technology Center, Lubricants Department 1, Idemitsu Kosan Co., Ltd.

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  • ファンデルワールス型液体密度方程式の導出と潤滑油の高圧密度の推算

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<p>In this study, I investigated the relationship between the high pressure density of lubricant and pressure and temperature. As a result, the van der Waals type liquid density equation was derived consisting of three material-specific constants: absolute zero density ρt=0[g/cm3], density constant 1/E[(g/cm3)GPa/K] and pressure constant F/E[GPa]. It was found that the absolute zero density ρt=0 and the pressure constant F/E in the liquid density equation are equivalent to the inverse of the absolute zero specific volume Vt=0 [cm3/g] and the corrected pressure PR for pressure drop due to the intermolecular force in the van der Waals type liquid state equation. This equation also agrees with the ideal liquid model density equation. This made it possible to estimate the high pressure density of lubricant.</p>

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  • Netsu Bussei

    Netsu Bussei 36 (2), 68-82, 2022

    JAPAN SOCIETY OF THERMOPHYSICAL PROPERTIES

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