引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览次   下载 本文二维码信息
码上扫一扫!
分享到: 微信 更多
长菱形微针肋热沉的流动与换热特性
夏国栋, 崔珍珍, 翟玉玲, 焦永刚, 李 健
(北京工业大学环境与能源工程学院,北京 100124)
摘要:
加工硅基长菱形微针肋热沉,并对其流动与换热性能进行试验研究和数值模拟。结果表明:在试验雷诺数Re范围内,长菱形针肋的换热系数随Re的增大而增大。雷诺数相同时,热流密度对换热系数的影响较小。热阻随泵功的增加不断降低;在泵功较小时,热阻降低的速度较快;当泵功增大到一定值时,热阻的变化趋于平缓。在一定的泵功下不同热流密度之间的总热阻没有太大的区别。努塞尔数Nu随Re增大而增大。与同样尺寸圆形、菱形针肋相比,长菱形针肋具有较好的换热性能,可以避免针肋尾部涡脱落造成的阻力损耗,同时长菱形针肋尾部延伸拓展了换热面积并扩大了固体导热区,从而提高换热效果。
关键词:  微针肋  流动  强化换热  热流密度
DOI:10.3969/j.issn.1673-5005.2014.02.020
分类号:TK 172 〖HTH〗
基金项目:国家“973”计划项目(2011CB710704)
Flow and heat transfer characteristics for long-diamond shaped micro pin fin
XIA Guo-dong, CUI Zhen-zhen, ZHAI Yu-ling, JIAO Yong-gang, LI Jian
(School of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China)
Abstract:
The silicon long-diamond shaped micro pin fin was manufactured, and the flow and heat transfer characteristics of long-diamond shaped micro pin fin were experimentally researched and numerically simulated. The results show that within the range of Re used in experiments, the heat transfer coefficient of the long-diamond shaped micro pin fin increases with the increase of Re. For the same Reynolds number, the heat flux has no effect on heat transfer coefficient. The thermal resistance will decrease with the pump power increasing, and decrease faster when pump power is small. When the pump power increases to a certain value, the thermal resistance will remain unchanged. There is no difference in total thermal resistance for different heat fluxes. Nu increases with the increase of Re. For the diamond shaped circular micro pin fin with the same size, 45° long-diamond micro pin fin has the best heat transfer performance. The long-diamond design can avoid the vortex shedding which causes the pressure loss. Also, the long-diamond design can extend the heat transfer area and improve the conductivity of solid. Therefore it can enhance the heat transfer effect.
Key words:  micro pin fin  flow  enhanced heat transfer  heat flux
版权所有 中国石油大学学报(自然科学版)编辑部 Copyright©2008 All Rights Reserved
主管单位:中华人民共和国教育部 主办单位:中国石油大学(华东)
地址: 青岛市黄岛区长江西路66号中国石油大学期刊社 邮编:266580 电话:0532-86983553 E-mail: journal@upc.edu.cn
本系统由:北京勤云科技发展有限公司设计