螺旋翅片管束换热过程的熵产分析  

Entropy Generation Analysis of Spiral Finned Tube Bundles During Heat Exchanging Process

作　　者：王乃华[1] 滕斌 高翔[3] 骆仲泱 岑可法[3] 

机构地区：[1]山东大学能源与动力工程学院,济南250061 [2]华电国际电力股份有限公司,济南250001 [3]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《动力工程》2009年第2期163-168,共6页Power Engineering

基　　金：山东省优秀中青年科学家奖励基金资助项目(2007BS04030);山东省自然科学基金资助项目(2008ZRB01816)

摘　　要：对不同翅片间距sf、管束横向节距st和管束纵向节距sl的9组螺旋翅片管束的换热和流动过程进行了试验研究.分析了换热过程的熵产,研究了雷诺数(Re)、翅片间距、管束横向节距和管束纵向节距对管束换热熵产数NsH、流动熵产数NsF和总熵产数Ns的影响.结果表明:对不同布置方式的管束,随着Re的增加,NsH迅速减小,NsF逐渐增加,Ns先减小后增加;翅片间距对NsH影响较小,在高Re下,翅片间距增大时,NsF和Ns均明显降低;横向节距对NsH几乎没影响,但随着横向节距的增加,NsF和Ns均明显降低;管束纵向节距对NsH、NsF和Ns的影响都很小.Heat exchange and flow process were experimentally studied for nine sets of spiral finned tube bundles with different fin spacing （sf）, tube bundle transverse pitch （st） and tube bundle longitudinal pitch （sl）. Entropy generation of the process was analyzed, and the effects of the Reynolds Number （Re）, fin spacing, tube bundle transverse pitch and tube bundle longitudinal pitch on entropy generation number of heat transfer （NsH）, entropy generation number of flow （NsF） and general entropy generation number （Ns） of the tube bundles were studied. Results show that for different arrangements of tube bundles, with the increase of Re, NsH decreases quickly, while NSF increases gradually, and Ns decreases at first, then increases later on. The effect of fin spacing on NSH is small. Under high Re, NsF and Ns decrease obviously with the increase of fin spacing. The transverse pitch almost has no effect on NSH. But with the increase of transverse pitch, NsF and Ns decrease obviously. The effects of longitudinal pitch on NsH, NsF and Ns are small.

关 键 词：螺旋翅片管束 熵产 换热过程 最优工况 

分 类 号：TK124[动力工程及工程热物理—工程热物理]