变扭率扭旋叶片强化传热特性

doi:10.11949/j.issn.0438-1157.20160493

化工学报 ›› 2016, Vol. 67 ›› Issue (12): 4951-4958.DOI: 10.11949/j.issn.0438-1157.20160493

变扭率扭旋叶片强化传热特性

张静^1,2, 米海英², 李雅侠², 张平², 吴剑华^1,2

1 天津大学化工学院, 天津 300072;
2 沈阳化工大学高校化工混合技术省级重点实验室, 辽宁沈阳 110142

收稿日期:2016-04-15 修回日期:2016-07-05 出版日期:2016-12-05 发布日期:2016-12-05
通讯作者: 吴剑华。syhgdx_wjh@163.com
基金资助:
国家自然科学基金项目（51506133）；辽宁省教育厅一般项目(L2014165)。

Characteristics of enhanced heat transfer of twisted elements with varying twist ratio

ZHANG Jing^1,2, MI Haiying², LI Yaxia², ZHANG Ping², WU Jianhua^1,2

1 School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China;
2 Engineering & Technology Research Center of Liaoning Province for Chemical Static Mixing & Reaction, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China

Received:2016-04-15 Revised:2016-07-05 Online:2016-12-05 Published:2016-12-05
Supported by:
supported by the National Natural Science Foundation of China(51506133) and the Foundation of Liaoning Educational Committee(L2014165).

摘要/Abstract

摘要：

为探究扭旋叶片的结构参数——扭率变化率Tv对管道换热的影响，以水为介质，在Tv=-5~5范围内，采用实验和数值模拟方法研究了恒壁温条件下流体的传热和阻力特性，并分析了综合传热性能及强化传热机理。结果表明，沿流动方向Tv>0的扭旋叶片安装方式强化传热效果优于Tv=0，研究范围内Tv=2.5时综合强化传热比最高，相对Tv=0平均提高5.0%。而Tv<0时强化传热效果劣于Tv=0，应避免此种叶片安装方式。扭率的变化影响了流场结构，当Tv>0时，在近1/2流动区域内绕流旋涡的涡量和影响区域明显增加，同时，在绕流旋涡流动区域，压力、速度和温度的三场协同程度得到提高，进而强化了换热管道的传热效果。

关键词: 扭旋叶片, 扭率变化率, 数值模拟, 强化传热, 场协同

Abstract:

The purpose of this paper is to investigate the heat transfer performance of the tubes with twisted elements at different twist ratio variation Tv. On the constant wall temperature boundary condition, the characteristics of heat transfer and pressure drop are investigated experimentally and numerically. Tv are within the scope of -5-5 and water is used as working fluid．The comprehensive heat transfer and heat enhancement mechanism are analyzed at different Tv. The results show that the condition of Tv>0 along the flow direction is superior to the condition of Tv=0. The average heat transfer enhancement ratio of Tv=2.5 is 5.0% higher than that of Tv=0. However，the heat transfer effect of Tv<0 is inferior to Tv=0, and thus the layout should be avoided. The flow field structures are altered by the change of the twist ratio of the elements. For the case of Tv>0, the vorticity and the action range of the detour-flow vortex within more than half of the element area are improved significantly with the increase of Tv. At the same time the coordination of pressure, velocity and temperature fields is improved and heat transfer is enhanced accordingly.

Key words: twisted element, twist ratio variation, numerical simulation, heat transfer enhancement, fields coordination

中图分类号:

TK124

张静, 米海英, 李雅侠, 张平, 吴剑华. 变扭率扭旋叶片强化传热特性[J]. 化工学报, 2016, 67(12): 4951-4958.

ZHANG Jing, MI Haiying, LI Yaxia, ZHANG Ping, WU Jianhua. Characteristics of enhanced heat transfer of twisted elements with varying twist ratio[J]. CIESC Journal, 2016, 67(12): 4951-4958.

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变扭率扭旋叶片强化传热特性

Characteristics of enhanced heat transfer of twisted elements with varying twist ratio

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