分液冷凝强化传热的实验验证

Heat transfer enhancement principle and experimental verification of liquid-vapor separation condensation

中文关键词: 气液分离  分液冷凝器  强化换热  降低流阻  惩罚因子

英文关键词: liquid vapor separation  heat transfer enhancement  pressure drop reduction  liquid separation condenser  penalty factor

中文摘要:

      阐述了分液冷凝强化冷凝传热的原理，从理论上分析了该技术能同时实现强化传热和降低压降的可行性。该结论在微通道平行流冷凝器上得到了实验证实：与常规的微通道平行流冷凝器（PFMC）对比表明，在当量直径为1.05mm的微通道中，管内工质的质量流量在633 kg/(m2s) ～770 kg/(m2s)范围内，当冷凝温度为45和50℃时，微通道分液冷凝器（LSMC）的管内传热系数分别提高了3.7%～6.7%和2.3%～6.1%，压降分别降低了45.5%～49.5%和51.9%-52.6%，惩罚因子（Fp）分别降低了46.5%～52.7%和52.6%～56.7%。当进口流量达到一定值时，分液冷凝技术器就能同时实现强化传热和降低流阻,有较好的综合热力性能。

英文摘要:

      Presents the heat transfer enhancement principle of liquid vapor separation condensation and analyzes its theoretical feasibility in heat transfer enhancement and pressure drop reduction. Compared to conventional parallel flow minichannel condenser(PFMC), it is experimentally found that, the in-tube heat transfer coefficient of liquid vapor minichannel condenser(LSMC) with 1.05mm hydraulic diameter at the condensation temperature of 45℃ and 50℃has improved by 3.7%～6.7% and 2.3%～6.1% respectively, the pressure drop has reduced by 45.5%～49.5% and 51.9%-52.6% respectively, and the penalty factor has reduced by 46.5%～52.7% and 52.6%～56.7%,respectively, in the mass flux range of 633-770 kg/(m2.s).This confirms that when the mass flux reaches some point, the LSMC may enhance heat transfer and absolutely reduce the pressure drop, thus having better comprehensive thermal performance.