微槽道脉动热管的启动及传热特性

doi:10.11949/j.issn.0438-1157.20151913

化工学报 ›› 2016, Vol. 67 ›› Issue (6): 2263-2270.DOI: 10.11949/j.issn.0438-1157.20151913

微槽道脉动热管的启动及传热特性

李孝军¹, 屈健¹, 韩新月¹, 王谦¹, 刘丰²

1. 江苏大学能源与动力工程学院, 江苏镇江 212013;
2. 江苏中圣高科技产业有限公司, 江苏南京 211112

收稿日期:2015-12-16 修回日期:2016-03-18 出版日期:2016-06-05 发布日期:2016-06-05
通讯作者: 屈健
基金资助:
国家自然科学基金项目(51576091);中国博士后科学基金特别资助项目(2015T80523)。

Start-up and heat transfer performance of micro-grooved oscillating heat pipe

LI Xiaojun¹, QU Jian¹, HAN Xinyue¹, WANG Qian¹, LIU Feng²

1. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
2. Jiangsu Sunpower Technology Co., Ltd., Nanjing 211112, Jiangsu, China

Received:2015-12-16 Revised:2016-03-18 Online:2016-06-05 Published:2016-06-05
Supported by:
supported by the National Natural Science Foundation of China (51576091) and the China Postdoctoral Science Special Foundation (2015T80523).

摘要/Abstract

摘要：

对竖直和水平放置情况下微槽道脉动热管(当量直径2.82mm)的启动及传热性能进行了实验研究,并与内径分别为3.4mm(1^#)、4.0mm(2^#)和4.8mm(3^#)的3个光管脉动热管进行了比较。实验工质为去离子水,充液率为50%。实验结果表明,竖直放置(底部加热)时,微槽道结构可以显著降低脉动热管的最小启动功率和启动温度,在约305W的加热功率下其热阻分别比1^#、2^#和3^#光管脉动热管下降41.7%、35.6%和30.9%,蒸发段壁面平均温度分别下降12.1、11.8和7.6℃;水平放置时,微槽道脉动热管在一定加热功率下能够正常启动,光管脉动热管难以有效运行。使用微槽道结构后,脉动热管显热和潜热传热能力的提高以及微槽道毛细作用利于冷凝液向蒸发段回流可认为是实现热管传热强化的主要原因。

关键词: 脉动热管, 微槽道, 相变, 传热, 两相流, 毛细作用

Abstract:

The start-up and heat transfer performance of a micro-grooved tube oscillating heat pipe (OHP) and three other smooth tube OHPs were experimentally investigated and compared both at vertical and horizontal orientations. Deionized water was used as the working fluid with a volumetric filling ratio of 50%. The internal diameters (IDs) of three smooth tube OHPs were 3.4 mm (1^#), 4.0 mm (2^#) and 4.8 mm (3^#), respectively, and the internal hydraulic diameter of the micro-grooved OHP was about 2.82 mm. The results showed that at the vertical bottom heat mode, the micro-grooved OHP had lower heating power input and average evaporator temperature as compared to other smooth tube OHPs. At a heating power input of about 305 W, the reductions in the thermal resistance of the micro-grooved tube OHP were about 41.7%, 35.6% and 30.9% as compared to that of the 1^#, 2^# and 3^# OHPs, and the corresponding reductions in the evaporator temperature were about 12.1℃, 11.8℃ and 7.6℃, respectively. At the horizontal orientation, only the micro-grooved OHP could start up favorably at the relatively low heating power inputs within all these four tested OHPs and indicated better heat transfer performance. According to a qualitative analysis, the heat transfer enhancement of the micro-grooved OHP was mainly attributed to the sensible/latent heat transfer intensification as well as enhanced liquid backflow to the evaporator due to the microgroove-induced capillary action.

Key words: oscillating heat pipe, microgroove, phase change, heat transfer, two-phase flow, capillary action

中图分类号:

TK124

李孝军, 屈健, 韩新月, 王谦, 刘丰. 微槽道脉动热管的启动及传热特性[J]. 化工学报, 2016, 67(6): 2263-2270.

LI Xiaojun, QU Jian, HAN Xinyue, WANG Qian, LIU Feng. Start-up and heat transfer performance of micro-grooved oscillating heat pipe[J]. CIESC Journal, 2016, 67(6): 2263-2270.

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微槽道脉动热管的启动及传热特性

Start-up and heat transfer performance of micro-grooved oscillating heat pipe

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