螺距和搭接对螺旋半管夹套强化传热的影响

doi:10.12034/j.issn.1009-606X.216382

过程工程学报 ›› 2017, Vol. 17 ›› Issue (4): 697-703.DOI: 10.12034/j.issn.1009-606X.216382

螺距和搭接对螺旋半管夹套强化传热的影响

张静^1,3，张艳秋²，吴剑华^1*

1. 天津大学化工学院，天津 300072; 2. 中航黎明锦西化工机械(集团)有限责任公司，辽宁葫芦岛 125001; 3. 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:2016-12-22 修回日期:2017-02-05 出版日期:2017-08-20 发布日期:2017-08-16
通讯作者: 张静 2501474185@qq.com
基金资助:
辽宁省自然科学基金项目;辽宁省博士科研启动基金项目

Effect of Varying Pitch and Overlap Scale on Enhanced Heat Transfer of Half-coil Jackets

Jing ZHANG^1,3，Yanqiu ZHANG²，Jianhua WU^1*

1. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China;
2. AVIC Liming Jinxi Chemical Machinery (Group) Company Limited, Huludao, Liaoning 125001, China;
3. Engineering & Technology Research Center of Liaoning Province for Chemical Static Mixing & Reaction, Shenyang University of Chemical Technology, Shenyang, Liaoning 110142, China

Received:2016-12-22 Revised:2017-02-05 Online:2017-08-20 Published:2017-08-16
Contact: ZHANG Jing 2501474185@qq.com
Supported by:
Foundation of Liaoning Educational Committee;The Doctoral Science Research Foundation of Liaoning Province

摘要/Abstract

摘要： 以导热油YD-300为介质，采用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，分析了强化传热机理. 结果表明，螺距参数τ接近1.96时强化传热效果最好，阻力最高. τ>1.96的非搭接结构，螺距变化对半管夹套侧传热系数和阻力系数的影响很小；τ<1.96的搭接结构，随螺距缩短半管夹套侧传热系数增加下降明显. 小范围(1.96>τ≥1.86)搭接形式改善了搭接壁面与换热壁面附近的速度场结构，有利于强化换热；大范围搭接(τ≤1.47)降低了搭接壁面和换热壁面附近的速度、温度梯度与静压力梯度间的协同程度，降低了换热系数，同时提高了阻力.

关键词: 螺旋半管夹套, 螺距, 搭接, 强化传热, 场协同

Abstract: On the constant wall temperature boundary condition, the heat transfer and pressure drop characteristics were investigated numerically by heat conducting oil YD-300 used as working fluid. The comprehensive heat transfer and heat enhancement mechanism were analyzed．The results showed that Nusselt number and flow resistance coefficient were the highest at the condition of pitch τ≈1.96. The effects on enhanced heat transfer and resistance coefficient were very small for half-coil jackets at varying pitch for the non-overlapping structure τ>1.96. Nusselt number decreased with pitch shortened for the overlapping structure τ<1.96. 1.96>τ≥1.86 was beneficial for heat transfer because the speed field was improved near the overlapping and heat exchange walls. But fields coordination was reduced between speed, temperature gradient and static pressure gradient when τ≤1.47, also heat transfer was declined and resistance was improved.

Key words: half-coil jacket, pitch, overlap, heat transfer enhancement, fields coordination

张静张艳秋吴剑华. 螺距和搭接对螺旋半管夹套强化传热的影响[J]. 过程工程学报, 2017, 17(4): 697-703.

Jing ZHANG Yanqiu ZHANG Jianhua WU. Effect of Varying Pitch and Overlap Scale on Enhanced Heat Transfer of Half-coil Jackets[J]. Chin. J. Process Eng., 2017, 17(4): 697-703.

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螺距和搭接对螺旋半管夹套强化传热的影响

Effect of Varying Pitch and Overlap Scale on Enhanced Heat Transfer of Half-coil Jackets

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