冷媒雰囲気中における油冷媒混合物のレオロジー特性

概要

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Oil film thickness and traction characteristics of polyol ester in some refrigerants are determined with an EHD tester, where increase in refrigerant gas pressure decreases film thickness as well as traction in each refrigerant. When compared at an identical gas pressure, the film formability with refrigerant is HFC-125>HFC-134a>HCFC-22, while that for the coefficient of traction is the same as film thickness. Oil film thickness and the coefficient of traction are inversely correlated with solubility of refrigerant in mole concentration. Then, by analyzing the traction measurements with the approximate formula, the rheological parameters are determined. As a result, the traction behavior is governed by the rheological parameters of refrigerant/polyol ester mixture at high pressures. The viscosity-pressure coefficient is inversely correlated while the representative stress positively with solubility of refrigerant in mole concentration. Finally, the relationship between the viscosity of the mixture and effective contact pressure at a constant gas pressure follows an entire curve described by the Roelands formula.
湘南工科大学の論文
2003-03-18