过渡流下圆柱不同间距比对壁面传热特性影响  

Effects of Different Spacing Ratio Between Cylinders on Heat Transfer Characteristics at the Wall in Transition Flow

作　　者：魏玉珍[1] 王丽娟[1] 喜冠南[1] WEI Yu-zhen;WANG Li-juan;XI Guan-nan(College of Mechanical Engineering,Nantong University,Jiangsu Nantong 226019,China)

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《机械设计与制造》2018年第4期94-96,100,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51476080);南通市传热强化与过程节能重点实验室项目(CP12012004)

摘　　要：目前换热器正朝着结构紧凑、小型化方向发展,换热器的管束细化使管外流场向过渡流状态转变。为了提高换热器的换热效率,采用基于复合网格系统的计算方法,建立了内插串列双圆柱对壁面强化传热模型并进行实验验证,通过数值分析研究过渡流状态下圆柱距壁面的不同间距比(C/D)对壁面传热特性的影响,以期优化圆柱下游壁面的流动传热特性。研究结果表明:近壁插入圆柱可强化圆柱下游处的壁面传热;不同C/D值对壁面的传热强化效果有显著影响,壁面的传热强化效果随C/D的增大而减小,在加工工艺条件允许的情况下应尽量使被插圆柱靠近壁面,这为过渡流下换热器的研究提供了参考。The current heat exchanger is developing towards the direction of compact structure and miniaturization,which will cause the flow field out of the pipe change to transition flow state.In order to improve the thermal efficiency of the heat exchanger,the calculating model of insering tandem two cylinders to enhance heat transfer of the wall was established in this study,which was based on the compound grid system.And the experimental verification was carried out.The effects of different spacing ratio(C/D)between tandem two cylinders and the wall on heat transfer characteristics at the wall in transition flow were studied by numerical analysis.As a result,the optimized effect on the heat transfer enhancement and flow characteristics at the downstream wall can be achieved.The results show that:Insering a circular cylinder at the wall can enhance the heat transfer of the wall.Different values of C/D have a significant influence on the enhancement of heat transfer at the wall.The enhancement of heat transfer at the wall decreases with the increase of C/D values.Therefore,under the permitting conditions,the cylinder should be close to the wall,which provides references for the study of heat exchangers in the transition flow.

关 键 词：换热器 过渡流 间距比 实验验证 数值分析 传热特性 

分 类 号：TH16[机械工程—机械制造及自动化] TK17[动力工程及工程热物理—热能工程]