Thermal properties of some lubricants under high pressure

• The thermal conductivity λ, specific‐heat capacity ρcp, and the point of glass transition have been determined for a range of lubricants. These included Santotrac 40; LAD 2201, a naphtenic mineral oil; Oxilube 50/150; and 5P4E, a polyphenyl ether. The thermal properties were determined by a hot‐wire probe method. Pressure was varied from 0–1.5 GPa and the range of temperature covered was in general 20–110 °C although Oxilube was taken down to −24 °C. The thermal conductivities at 1.5 GPa were found to be roughly twice that of the oils at atmospheric pressure. The temperature dependence of the glass formation pressure was found to be quite different for the oils studied. The results obtained will be particularly useful for people studying elastohydrodynamic lubrication.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

Lubricant

oil

mineral oil

high pressure

thermal conductivity

specific heat

heat capacity

glass transition

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