带扰流孔波纹板蓄热元件的分析  

Exergy analysis of heat transfer elements of corrugated plate with perforations

作　　者：李鹏程[1,2] 孙志坚[1,2] 黄浩[1,2] 程攻[1,2] 胡亚才[1,2] 

机构地区：[1]浙江大学热工与动力系统研究所,浙江杭州310027 [2]浙江省制定与低温技术重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2016年第2期306-311,共6页Journal of Zhejiang University：Engineering Science

基　　金：金华市科学技术研究计划重点资助项目(20131031)

摘　　要：针对带扰流孔波纹板蓄热元件强化传热的综合效果较难评价的问题,提出基于热力学定律的分析方法.采用瞬态实验方法得到了损与损系数随雷诺数的变化曲线,曲线表明损和损系数在雷诺数为4 400左右有一个转折点,转折点处损和损系数的数值均达到峰值.转折点存在的原因为流体的流态处于过渡态时流体的无规则运动变化剧烈,导致流体的熵增会随雷诺数的增大而增大使损和损系数数值达到最大,分别为41kJ、0.65.转折点即为流体流态从过渡态转变到完全湍流的临界点.结果表明,分析方法可较合理地评价强化传热综合效果且转折点附近能量浪费严重.A thermodynamic exergy analysis method was adopted in order to solve the problem that it is hard to evaluate the performance of corrugated plate heat transfer elements with perforations.Exergy loss curve and exergy loss coefficient curve were obtained by using transient test method.The curves both have a turning point at Reynolds number of about 4 400,and achieve the peak value at the turning point.The turning point was derived from the transition state that has violent irregular intense motions,and the entropy increases with the rising Reynolds number,making exergy loss and exergy loss coefficient get the maximum value of 41 kJ and 0.65,respectively.Turning point is the critical point of transition state to fully turbulent.The result shows that the exergy analysis method can evaluate the effect of heat transfer enhancement reasonably,and serious energy waste happens near the turning point.

关 键 词：扰流孔 波纹板蓄热元件 损失 损失系数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]