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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.
The heat transfer and flow of 9 spiral finned tube bundles with different fin spacing sf, tube bundle transverse pitch st and tube bundles longitudinal pitch sl were experimentally studied.The entropy yield of the heat transfer process was analyzed, and the Reynolds number ( Re), fin spacing, tube bundle transverse pitch and tube bundle longitudinal pitch on the tube heat transfer entropy yield NsH, flow entropy yield NsF and total entropy yield Ns.The results show that with different arrangements of tube bundle, with With the increase of Re, NsH decreases rapidly, NsF increases gradually, and Ns decreases first and then increases. The fin spacing has little effect on NsH. Under high Re, the NsF and Ns decrease significantly when the fin spacing increases. Pitch had almost no effect on NsH, but NsF and Ns decreased with the increase of transverse pitch. The effect of longitudinal tube pitch on NsH, NsF and Ns was small.