螺旋扁管折流杆换热器传热强化数值模拟研究  

Numerical simulation on heat transfer enhancement of spiral-flat tubes for rod-baffle heat exchangers

作　　者：王斯民[1] 孙利娟 宋晨 肖娟[1] 简冠平[1] 张早校[1] 文键[2] WANG Si-min;SUN Li-juan;SONG Chen;XIAO Juan;JIAN Guan-ping;ZHANG Zao-xiao;WEN Jian(School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710049 [2]西安交通大学能源与动力学院,陕西西安710049

出　　处：《高校化学工程学报》2020年第1期76-85,共10页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51676146);中央高校基本科研业务费专项资金(xjj2018202)

摘　　要：为强化折流杆换热器(RBHEs)的壳程传热,提出了用螺旋扁管代替传统圆管作为换热管应用于RBHEs,比较了螺旋扁管RBHES和传统圆管RBHEs的流动、传热和综合性能。结果表明:螺旋扁管RBHEs的管间速度更大,分布更加均匀;贴近换热管的壁面处,湍动能更大,流体温度更高。当入口速度低时,螺旋扁管RBHEs的传热系数大于圆管RBHEs,当入口速度高时,螺旋扁管RBHEs的传热系数小于圆管RBHEs。螺旋扁管RBHEs的压降比圆管RBHEs小33.60%。螺旋扁管RBHEs的综合性能评价指标(PEC)比圆管RBHEs的提高了65%~152%,且低速入口条件下,提高作用更明显。In order to enhance the shell-side heat transfer of rod-baffle heat exchangers(RBHEs),spiral-flat tubes were applied to substitute traditional circular tubes.The flow,heat transfer and comprehensive performance of spiral-flat tube RBHEs and traditional circular tube RBHEs were compared via numerical simulation.The results show that the velocity between tubes is higher in spiral-flat tube RBHEs with more uniform velocity distribution.Moreover,the turbulent kinetic energy and fluid temperature near tubes were higher.When the inlet velocity was lower,the heat transfer coefficient of spiral-flat tube RBHEs was larger than that of circular tube RBHEs.When the inlet velocity was higher,the heat transfer coefficient of spiral-flat tube RBHEs was smaller.The pressure drop of spiral-flat tube RBHEs was 33.60% smaller.The comprehensive performance evaluation criteria(PEC)of spiral-flat tube RBHEs was 65%~152% higher than circular tube RBHEs’and the advantage was more obvious under lower inlet velocity.

关 键 词：折流杆换热器 螺旋扁管 圆管 数值模拟 传热强化 

分 类 号：TK124[动力工程及工程热物理—工程热物理]