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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、10 ppi/95%孔隙率和30 ppi/98%孔隙率,厚度均为10 mm。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。
Experimental study of high oil concentration refrigerant / oil mixture on the foam metal heating surface pool boiling heat transfer characteristics. Three types of foam copper were used as the heating surface with parameters of 10 ppi / 90% porosity, 10 ppi / 95% porosity and 30 ppi / 98% porosity, respectively, with a thickness of 10 mm. The refrigerant is R113, the lubricant is VG68, the oil concentration is 0% ~ 40%. The experimental results show that the foam metal always enhances the pool boiling heat transfer, the heat transfer coefficient increases by up to 450%; the deterioration of the lubricant refrigerant pool heats up in the foam metal heating surface, the heat transfer coefficient is reduced by up to 90%. A correlation equation was established between the boiling and exothermic heat transfer of the refrigerant / oil mixture with high oil concentration on the foam metal heating surface. The predicted value was within ± 30% of the experimental value of 95%.