迷惑
管壳式换热器
热交换器
压力降
机械
螺旋角
传热
材料科学
传热系数
同心管换热器
板式换热器
壳体(结构)
微型热交换器
热力学
化学
复合材料
物理
作者
Jianfei Zhang,Bin Li,Weixin Huang,Yonggang Lei,Ya‐Ling He,Wen‐Quan Tao
标识
DOI:10.1016/j.ces.2008.12.018
摘要
Presented in this paper are experimental test and comparison for several shell-and-tube heat exchangers, one with segmental baffles and four with helical baffles at helix angles of 20∘, 30∘, 40∘ and 50∘, respectively. The results show that, based on the same shell-side flow rate, the heat transfer coefficient of the heat exchanger with helical baffles is lower than that of the heat exchanger with segmental baffles while the shell-side pressured drop of the former is even much lower than that of the later. Further enhancement techniques should be incorporated in order to enhance shell-side heat transfer based on the same flow rate. The comparison of heat transfer coefficient per unit pressure-drop (and pumping power) versus shell-side volume flow rate shows that (1) the heat exchanger with helical baffles have significant performance advantage over the heat exchanger with segmental baffles; (2) for the same shell inner diameter, the performance of heat exchanger with helical baffles with 30° helix angle is better than that of 20°, and the performance of 40° helix angle is better than that of 50° helix angle. The heat exchanger with helical baffles of 40° angle shows the best performance among the five heat exchangers tested.
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