内置偏心螺旋扭带换热管层流传热的数值模拟  

Numerical Simulation of Laminar Heat Transfer of Heat Exchange Tube Inserted an Eccentric Twisted Tape

作　　者：王宗勇[1] 田瑞[1] 崔艳军 朱军[1] 王舒婷[1] 

机构地区：[1]沈阳化工大学化工过程强化研究所,辽宁沈阳110142 [2]中国石油天然气第八建设有限公司,辽宁抚顺113006

出　　处：《沈阳化工大学学报》2016年第4期344-350,共7页Journal of Shenyang University of Chemical Technology

基　　金：辽宁省自然科学基金项目(201502148);辽宁省百千万人才工程项目(2013921047)

摘　　要：利用数值模拟方法对本文提出的内置偏心螺旋扭带换热管模型的层流传热特性进行计算与分析.研究结果表明:在一定的结构参数范围内,换热管的对流传热系数随着扭带偏心率的增加而增大,且雷诺数越大增幅越显著;在层流状态下,增大扭带偏心率能降低流体流动阻力系数,特别是在较低雷诺数下,阻力系数降低的程度更为明显;在雷诺数及扭带偏心率一定的情况下,换热管的对流传热系数随扭带扭率的减小而增大,但阻力系数也相应增大;换热性能评价指标在层流状态下均大于1,且随着偏心率及雷诺数的增加而变大,但当Re>1 500后评价指标产生小幅波动,表明流体逐步由层流状态过渡到湍流状态.The laminar transfer characteristics of heat exchange tube inserted an eccentric twisted tape is calculated and analyzed by simulation method. The results show that the convective heat transfer coefficient increases with the eccentric ratio of the twisted tape, and the increased amplification is more obvious at higher Reynolds number in a certain range of structure parameters. The flow resistance factor was reduced by raising eccentric ratio of the twisted tape in laminar flow, and the decreased amplification of flow resistance factor became more obvious especially at lower Reynolds number. The convective heat transfer coefficient of the tube increases with the decline of twist ratio of the twisted tape if the Reynolds number and the eccentric ratio were both fixed, while the flow resistance factor rises accordingly. PEC （performance evaluation criterion） increases with eccentric ratio of twisted tape and Reynolds number, all of which are greater than one. However, PEC had some tiny fluctuations when Re 〉 1 500, which was shown that the flow regime had changed from laminar flow to turbulence flow in the tube.

关 键 词：换热管 数值模拟 螺旋扭带 偏心 强化传热 

分 类 号：TK172[动力工程及工程热物理—热能工程]