11401 CO_2冷媒雰囲気における潤滑膜内の冷媒溶解濃度測定(機械要素のトライボロジー(1),OS.7 機械要素のトライボロジー,学術講演)

抄録

The dissolution of refrigerant into a lubricant causes a decrease in viscosity of oil and it gives a large effect on lubrication of sliding parts under refrigerant atmosphere. This paper presents the refrigerant concentration in lubrication film between a cylinder and a disk CO_2 refrigerant atmosphere. The refrigerant concentration was measured using a micro FT-IR through a sapphire window attached to a pressure vessel. The results indicate that the refrigerant concentration at the entrance is equal to the refrigerant concentration in bulk fluid but he refrigerant concentration reduces in a herzian contact area. In addition, when oil film thickness becomes thin with increasing refrigerant concentration in bulk fluid, oil tempreture, or load, the refrigerant concentration in lubrication film reduces.