水平微肋管内流动蒸发换热特性的实验研究  

FLOW EVAPORATION HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL MICRO-FIN TUBES

作　　者：吴晓敏[1] 王晓亮[1] 王维城[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《化工学报》2003年第9期1215-1219,共5页CIESC Journal

摘　　要：为了研究微肋管结构尺寸及工况等对管内流动蒸发性能的影响 ,对 4种微肋管和 1根 9 5 2mm光管进行了实验 ,4根微肋管中管外径为 9 5 2mm和 7mm的各 2根 ,所用工质为R2 2 .实验中质量流速变化范围为90～ 4 0 0kg·m-2 ·s-1,所选工况为 :蒸发温度 7℃ ,入口干度 15 %～ 2 0 % ,出口过热度 5～ 6℃ .获得了蒸发换热性能随质量流速的变化 ,讨论了微肋结构尺寸和管径等对蒸发换热性能的影响 .两根 9 5 2mm微肋管的传热系数比光管分别分别提高了 130 %和 180 % ,而其内表面积只比光管分别增加了 4 0 %和 70 % .To investigate the effects of micro-fin geometry and operating conditions on flow evaporation performance of micro-fin tubes, tests were conducted on four micro-fin tubes having different micro-fin geometries and one smooth tube having 9.52 mm outside diameter (OD). Two of the micro-fin tubes had 9.52 mm OD and the remaining two had 7.0 mm OD. The refrigerant used was R22. The experiments were carried out for 90-400 kg&middotm-2&middots-1 refrigerant mass fluxes at 7°C evaporation temperature, 15%-20% inlet vapor quality, 5-6°C outlet superheat degrees. The variations of evaporation performance of micro-fin tubes with refrigerant mass flux were obtained. The effects of micro-fin geometry and tube diameter on performance were discussed. The two 9.52 mm OD micro-fin tubes yielded 130% and 180% greater heat transfer coefficients than the smooth tube, while the inside surface areas of the two micro-fin tubes were only 40% and 70% greater than that of the smooth tube.

关 键 词：微肋管 强化传热 流动蒸发 

分 类 号：TK124[动力工程及工程热物理—工程热物理]