H形树网通道中湍流对流换热熵产分析  

Entropy generation analysis in H-shaped flowing channels of turbulent convective heat transfer

作　　者：邱肃肃[1,2,3] 谢志辉[1,2,3] 陈林根[1,2,3] 杨爱波[1,2,3] 

机构地区：[1]海军工程大学热科学与动力工程研究室,湖北武汉430033 [2]海军工程大学舰船动力工程军队重点实验室,湖北武汉430033 [3]海军工程大学动力工程学院,湖北武汉430033

出　　处：《节能》2016年第11期13-18,39,共7页Energy Conservation

基　　金：国家自然科学基金(项目编号:51579244;51206184)

摘　　要：在管壁恒热流密度条件下,以H形树网通道中湍流对流换热过程为研究对象,推导出了熵产率解析式和每一级通道无量纲数Be的解析式,分析了通道级数对熵产率和无量纲数Be的影响。结果表明:对于树网中任意一级通道,传热熵产率随着通道级数的增大而呈指数增长,粘性耗散熵产率随着通道级数的增大而减小;对于树网中的n级通道,总传热熵产率和总粘性耗散熵产率均随通道级数的增大而增大,但总传热熵产率的增大速率大于总粘性耗散熵产率的增大速率,并且总粘性耗散熵产率随通道级数的增大而趋近于一确定值。任意一级通道的Be数随第一级通道的Be数增大而增大,随通道级数的增大而趋近于1。The entropy generation rate analytical formations and the dimensionless Be numbers in every order channels are deduced for the turbulent convective heat transfer process in H-shaped tree-like flowing channels with prescribed heat flux on the walls. And the influences of the order number of flowing channels on the entropy generation rate and the Be numbers are investigated. The results show that: for flowingchannels with any fixed order,thermal entropy generation rate increases exponentially as the order number of flowing channels increases,while frictional entropy generation rate decreases as the order number of flowing channels increases. For total n orders of H-shaped flowing channels,as the order number of flowing channels increases,total thermal entropy generation rate and total frictional entropy generation rate both increase while the former increases faster than the later. The total frictional entropy generation rate increases as the order number of flowing channels increases and approaches to one certain value. The Be number in any fixed order of flowing channels increases as the Be number in the first channel increases,and as the order number of flow-ing channels increases,Be number of each fixed order number increases and approaches to the value of 1.

关 键 词：构形理论 湍流流动 对流换热 树网通道 熵产分析 

分 类 号：TK112[动力工程及工程热物理—热能工程]