微针肋形状对流动传热影响的数值研究  

Numerical study of the effect of micro-pin-fin shape on flow heat transfer

作　　者：孙欢[1] 刘俊丹 郑晨潇[1] 李园园[2] 曲麒峰 Sun Huan;Liu Jundan;Zheng Chenxiao;Li Yuanyuan;Qu Qifeng(Tianjin Key Lab of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China;Fushun Vocational Technical Institute,Fushun 113001,China)

机构地区：[1]天津商业大学,天津市制冷技术重点实验室,天津300134 [2]抚顺职业技术学院,抚顺113001

出　　处：《低温与超导》2024年第10期76-84,共9页Cryogenics and Superconductivity

基　　金：天津市科技计划项目(19JCTPJC51300)资助。

摘　　要：为研究不同针肋截面形状对微针肋换热器流动及传热的影响,本文采用CFD模拟软件对菱形、半菱形-前、半菱形-后、三角形-前、三角形-后五种针肋截面形状的微针肋换热器在相同工况下的速度场和温度场进行了数值模拟,并设置对照组(无肋板)利用摩擦系数f、努塞尔数Nu、综合评价因子CPE等参数对微针肋换热器的流动及传热性能进行评价。结果表明,迎流面为平面结构的针肋形状对流体的扰动作用更强,从而使其对流换热能力更强,但同时会带来更大的压降和摩擦阻力损失。综合评价,在雷诺数200~300的范围内,三角形-前针肋微针肋换热器的综合评价因子最高;在雷诺数300~1 000的范围内,半菱形-后针肋微针肋换热器的综合评价因子最高。In order to study the effect of different pin-fin cross-section shapes on the flow and heat transfer of the micro-pin-fin heat exchanger,CFD simulation software was used to numerically simulate the velocity and temperature fields of the micro-pin-fin heat exchanger with five pin-fin cross-section shapes,namely rhombic,semi-rhombic-front,semi-rhombic-back,triangular-front,and triangular-back in the same working condition.The performances of micro pin-fin heat exchanger were evaluated based on using parameters of the coefficient of friction,Nusselt number and the integrated evaluation factor Cpe-The results show that the pin-fin shape with a planar structure on the flow-facing surface has a stronger perturbation effect on the fluid,which leads to a stronger convective heat transfer capability,but at the same time brings about a larger pressure drop and frictional resistance loss.In the comprehensive evaluation,in the range of Reynolds number from 200 to 300,the triangular-front micro-pin-fin heat exchanger has the highest comprehensive evaluation factor,and in the range of Reynolds number from 300 to 1000,the semi-rhombic-back micro-pin-fin heat exchanger has the highest comprehensive evaluation factor.

关 键 词：微针肋 换热器 数值模拟 流动及传热 性能 

分 类 号：TK124[动力工程及工程热物理—工程热物理]