Abstract
EHD traction of polyol ester in some refrigerants is analyzed using the non-Newtonian theory, from which available rheological parameters are determined. Then the rheological parameters are studied in elation to refrigerant concentration. As a result, the viscosity pressure coefficient of the mixtures is inversely correlated with refrigerant concentration in terms of mole per volume, while the representative stress characterizing the non-Newtonian is positively correlated. When the viscous volume relating to the unit of viscous flow is plotted as a function of molecular volume of refrigerant/POE mixture, the relation between them is well described by a single line independent of kinds of refrigerants.
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