螺旋管内传热过程的不可逆损失分析  

Irreversible loss analysis of heat transfer in helical tube

作　　者：李雅侠[1] 吴剑华[1] 张丽[1] 龚斌[1] 

机构地区：[1]沈阳化工学院机械工程学院

出　　处：《冶金能源》2009年第2期34-37,共4页Energy For Metallurgical Industry

基　　金：国家"十五"科技攻关项目(2004BA319B1)

摘　　要：以水为工作介质,给出了表征不可逆损失的无因次熵产数Ns的计算式;并应用最小熵产原理分析了各种参数对不可逆损失的影响。结果表明:层流状态下存在一个最佳Re数使Ns值最小,影响不可逆损失和最佳Re数的主要因素是无因次入口温差τ、定义的无因次数ψ2及半径比δ。这对确定螺旋管合理的流动工况、结构参数和减小传热过程中的不可逆损失有重要意义。The formula of dimensionless entropy generation number charactering irreversible loss was obtained for water as working medium in the helical tube. Based on minimal entropy generation principle, the effect of aU kinds of parameters on the irreversible loss was analyzed. The results show that in laminar condition there is an optimum Re number that can make the dimensionless entropy generation number be minimal, the irreversible loss and Re number are primarily affected by temperature difference of inlet, dimensionless number ψ2 and the ratio of radius. The method and result are virtue for determining the reasonable fluid condition, parameters of a helical tube and saving energy of heat transfer process.

关 键 词：螺旋管 不可逆损失 熵产 最佳Re数 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TM273[动力工程及工程热物理—热能工程]