绝热圆腔内4根冷热微管阵列振动强化传热实验

doi:10.16085/j.issn.1000-6613.2015.06.009

化工进展 ›› 2015, Vol. 34 ›› Issue (06): 1557-1563,1581.DOI: 10.16085/j.issn.1000-6613.2015.06.009

绝热圆腔内4根冷热微管阵列振动强化传热实验

李萌, 戴传山

天津大学机械工程学院中低温热能高效利用教育部重点实验室, 天津 300072

收稿日期:2014-11-06 修回日期:2014-11-25 出版日期:2015-06-05 发布日期:2015-06-05
通讯作者: 戴传山,教授,博士生导师,主要从事强化传热、多相流、微尺度传热传质、地热能开发及利用等相关研究。
作者简介:李萌(1989—),男,硕士研究生,主要从事微尺度强化传热相关研究。E-mail:limeng8901@163.com。
基金资助:
国家自然科学基金(51306130)及国家重点基础研究发展计划(2011CB707203)项目。

An experimental study of enforced heat transfer of four vibrated hot and cold microtube array in an adiabatic cylindrical enclosure

LI Meng, DAI Chuanshan

Key Laboratory of Efficient Utilization of Low and Medium Grade Energy, Ministry of Education, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China

Received:2014-11-06 Revised:2014-11-25 Online:2015-06-05 Published:2015-06-05

摘要/Abstract

摘要： 目前针对微细管管外同时有自然对流和周期横向振动存在情况下的混合对流问题鲜有研究。为了探究这种现象, 进而开发一种新型的换热器, 本文提出了一种由4根冷热微细管组成的微管阵列, 将其平行放置于有中间流体的圆形腔体内, 并对管束施加微小横向振动的混合对流传热机理进行研究。详细描述了实验系统及实验方法, 以及后期对实验数据的处理方法, 得到了传热Nu数随管间自然对流强度Ra数, 强迫振动Re_v数等量纲为1参数的变化曲线;揭示了该结构形式下传热特性随冷热管温差、振动频率、微管振幅等传热规律。结果表明, 横向振动在小温差情况下传热强化效果更为明显。将本文实验数据与Lemlich单管振动实验中的数据进行对比, 表明了振动对4根微管阵列的强化传热效果比单根管更明显。

关键词: 微管, 振动, 强化传热, 微尺度, 传热, 对流

Abstract: Little research has been done on mixed convection in the existence of natural convection and periodic vibration transversely around microtubes. In order to investigate this situation and develop a new-type heat exchanger, this research established horizontally parallelized hot and cold microtube array immersed in an adiabatic cylindrical enclosure, and investigated the heat transfer mechanism of mixed convection with transverse micro-vibration full of third fluid. The natural convection surrounding the hot and cold microtubes in the cylindrical enclosure was measured at various inlet temperatures and mass flowrates. In addition, experiment system, methods and data-processing were described in detail. The relationship of Nusselt number with Ra number and Re_v number was obtained. These parameters disclosed the heat transfer law of heat-transfer characteristics at temperature differences between hot and cold tubes, vibration frequencies and microtube amplitudes. The results showed that the enhanced heat transfer was more remarkable at small temperature differences under vibrating conditions. The comparison between experimental data and Lemlich’s single tube vibration data showed heat transfer due to vibration with four microtubes was more distinct.

Key words: microtube, vibration, enhanced heat transfer, microscale, heat transfer, convection

中图分类号:

TK123

李萌, 戴传山. 绝热圆腔内4根冷热微管阵列振动强化传热实验[J]. 化工进展, 2015, 34(06): 1557-1563,1581.

LI Meng, DAI Chuanshan. An experimental study of enforced heat transfer of four vibrated hot and cold microtube array in an adiabatic cylindrical enclosure[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1557-1563,1581.

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绝热圆腔内4根冷热微管阵列振动强化传热实验

An experimental study of enforced heat transfer of four vibrated hot and cold microtube array in an adiabatic cylindrical enclosure

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