润滑油对小管径强化管内R410A流动冷凝压降特性的影响

对环保制冷工质R410A与润滑油混合物在4 mm小管径内螺纹强化管内流动冷凝的压降特性进行了实验研究，分析了润滑油对流动冷凝摩擦压降的影响.结果表明，在干度小于0.6时，润滑油会减小R410A在4 mm强化管内的冷凝摩擦压降，最大可减小12%；而在干度大于0.6时，润滑油会增大R410A在4 mm强化管内的冷凝摩擦压降，最大可增加13%.结合已有文献中的数据，基于混合物性建立了适用于R410A 油混合物在小管径强化管内流动冷凝的压降关联式，关联式预测值与94%的实验值误差在±30%以内.

The Influence of Oil on Pressure Drop of R410A Flow Condensation in Small Diameter Microfin Tube

The pressure drop characteristics of R410A oil mixture flow condensation inside a small diameter microfin tube were investigated experimentally, and the effect of oil on frictional pressure drop was analyzed. The results show that, when the vapor quality is lower than 0.6, the presence of oil decreases the condensation frictional pressure drop of R410A, and the decrement can reach up to 12% at the present test conditions; when the vapor quality is higher than 0.6, the presence of oil increases the condensation frictional pressure drop of R410A, and the increment can reach up to 13% at the present test conditions. A new correlation of frictional pressure drop for R410A oil mixture flow condensation inside small diameter microfin tubes was developed based on the mixture properties, and it can agree with 94% of the experimental data within a deviation of ±30%.