Constructal entransy dissipation rate minimization for leaf-like fins

查看全文 作　　者：FENG [1]HuiJun;CHEN [1]LinGen;SUN [1]FengRui

机构地区：[1]College of Naval Architecture and Power,Naval University of Engineering,Wuhan 430033,China

出　　处：《Science China(Technological Sciences)》索引2012年第55卷第2期,共12页

基　　金：supported by the National Natural Science Foundation of China (Grant No. 51176203);the Natural Science Foundation of Naval University of Engineering (Grant No. HGDYDJJ10011);the Natural Science Foundation for Youngsters of Naval University of Engineering (Grant No. HGDQNJJ10017) 摘　　要：Based on constructal theory,the constructs of the leaf-like fins are optimized by taking minimum entransy dissipation rate(for the fixed total thermal current,i.e.,the equivalent thermal resistance) as optimization objective.The optimal constructs of the leaf-like fins with minimum dimensionless equivalent thermal resistance are obtained.The results show that there exists an optimal elemental leaf-like fin number,which leads to an optimal global heat conduction performance of the first order leaf-like fin.The Biot number has little effects on the optimal elemental fin number,optimal ratios of length and width of the elemental and first order leaf-like fins;with the increase of the thermal conductivity ratio of the vein and blade,the optimal elemental fin number and optimal ratio of the length and width of the elemental leaf-like fin increase,and the optimal shape of the first order leaf-like fin becomes tubbier.The optimal construct based on entransy dissipation rate minimization is obviously different from that based on maximum temperature difference minimization.The dimensionless equivalent thermal resistance based on entransy dissipation rate minimization is reduced by 11.54% compared to that based on maximum temperature difference minimization,and the global heat conduction performance of the leaf-like fin is effectively improved.For the same volumes of the elemental and first order leaf-like fins,the minimum dimensionless equivalent thermal resistance of the first order of the leaf-like fin is reduced by 30.10% compared to that of the elemental leaf-like fin,and the global heat conduction performance of the first order leaf-like fin is obviously better than that of the elemental leaf-like fin.Essentially,this is because the temperature gradient field of the first order leaf-like fin based on entransy dissipation rate minimization is more homogenous than that of the elemental leaf-like fin.The dimensionless equivalent thermal resistance defined based on entransy dissipation rate reflects the average heat transfer performance of the leaf-like fin,and can provide some guidelines for the thermal design of the fins from the viewpoint of heat transfer optimization. 关键词：构形理论耗散率最小化鳍片片状热传导性能最佳结构温度梯度场

相关文献

参考文献（30）
引证文献（19）
耦合文献（164）

参考文献(30)

引证文献(19)

耦合文献(164)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Constructal entransy dissipation rate minimization for leaf-like fins

参考文献(30)

引证文献(19)

耦合文献(164)

用户提示