实验研究了高油浓度的制冷剂／油混合物在泡沫金属加热表面池沸腾换热特性。使用三种泡沫铜作为加热表面，其参数分别为10ppi／90％孔隙率、10ppi／95％孔隙率和30ppi／98％孔隙率，厚度均为10mm。制冷剂为R113，润滑油为VG68，油浓度为0％-40％。实验结果表明，泡沫金属总是强化池沸腾换热，换热系数最多提高450％；润滑油恶化制冷剂在泡沫金属加热表面池沸腾换热，换热系数最多降低90％。开发了高油浓度的制冷剂／油混合物在泡沫金属加热表面池沸腾换热关联式，预测值与95％的实验值误差在±30％以内。
Nucleate pool boiling heat transfer characteristics of refrigerant/oil mixture with high oil concentration on metal foam covers were experimentally investigated. The copper foams, having ppi （pores per inch） of 10 and 30, porosity from 90% to 98%, and thickness of 10mm, are selected in this study.The refrigerant is Rl13, and the oil is VG68 with the concentration from 0 to 40%. The experimental results indicate that the nucleate pool boiling heat transfer coefficient on copper foam covers is larger than that on fiat heated surface by a maximum of 450% under the present experimental conditions; the presence of oil deteriorates the nucleate pool boiling heat transfer on copper foam covers by a maximum of 909 under the present experimental conditions. A correlation for predicting the nucleate pool boiling heat transfer coefficient of refrigerant/oil mixture with high oil concentration on metal foam cover is developed, and it agrees 95% of the experimental data with in a deviation of ±30%.
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