不锈钢三维强化管管内流动沸腾与冷凝传热实验  

Experiments on Flow Boiling and Condensation Heat Transfer in Stainless Steel Three-dimensional Enhanced Tubes

作　　者：郭雨 顾宗保 张传财 何燕[1] 张斌[1] 李蔚[1] GUO Yu;GU Zongbao;ZHANG Chuancai;HE Yan;ZHANG Bin;LI Wei(College of Electromechanical Engineering,Qingdao University of Science and Technology,Qingdao 266061,China)

机构地区：[1]青岛科技大学机电工程学院,山东青岛266061

出　　处：《青岛科技大学学报（自然科学版）》2020年第5期102-108,共7页Journal of Qingdao University of Science and Technology:Natural Science Edition

基　　金：浙江省自然科学基金项目(LY19E060004).

摘　　要：实验研究制冷剂R134A和R410A在光管与不锈钢三维强化管(1EHT,3EHT)管内冷凝蒸发换热特性。实验条件:选取具有相同外径15.88 mm的光管与强化管(1EHT,3EHT),其中:1EHT表面结构是由一系列凹坑与花瓣组成,3EHT则是由矩形腔组成,在冷凝实验饱和温度为318.15 K,进出口干度为0.8和0.2;蒸发实验饱和温度为279.15 K,进出口干度为0.1和0.6,分别进行实验。结果表明:对于蒸发和冷凝,1EHT具有最佳的换热性能,并且3EHT的换热性能优于光管。An experimental investigation of condensation and evaporation heat transfer characteristics was performed in a smooth tube and two enhanced tubes(1EHT,3EHT)using R134A and R410A as refrigerant.All tested tubes have the same outer diameter of 15.88 mm.The enhanced surface of the 1EHT tube is made up by dimples and a series of petal arrays,while that of 3EHT tube is rectangular cavities.The test runs are performed at a saturation temperature of 318.15 K,over the quality range of 0.8—0.2 for condensation and at a saturation temperature of 279.15 K,over the quality range of 0.1—0.6 for evaporation.For evaporation and condensation,the 1EHT tube provides the best heat transfer performance,and the heat transfer characteristics of 3EHT is better than that of smooth tube.This is mainly due to the dimples and rectangular cavities that increase heat transfer surface area and interface turbulence,producing additional disturbances,secondary flows near the boundary and flow separation.Similarly,the pressure drop of 1EHT is the largest,and the pressure drop of 3EHT is greater than that of the smooth tube.

关 键 词：两相流 传热 蒸发 冷凝 三维强化管 

分 类 号：TK124[动力工程及工程热物理—工程热物理]