摘要
针对前期试验过程,采用商用软件FLUENT进一步分析了流体横掠方形微针肋热沉的流动及换热特性.结果表明,RNGk-ε紊流模型更适应试验工况;流体流线曲折,扰动强;流动过程中,流体压力不断降低,温度逐渐升高,在针肋区尾部形成大小不一的涡流,涡流中压力保持不变,但温度有较大波动;沿流动方向,各个肋的换热系数不断降低,但降低幅度在减小,到达一定肋数后几乎不再变化,且肋正面与背面的换热系数差别也随流动的发展不断减小.
Based on the early experimental investigation, further numerical analysis of fluid flow and heat transfer in micro pin fin heat sink are discussed in this paper by utilizing the FLUENT, a commercial software. The results indicate that the turbulence model of RNG k - e is more suitable for present experiment condition than other models. The streamline in the micro pin fins is very flexuous. Along the streamline, the pressure of the fluid decreases, while the fluid temperature increases. Vortexes with different sizes, in which pressure keeps constant and temperature fluctuates sharply, are found in the tail part of the pin fins. The heat transfer coefficient of fins reduces following the direction of flow, however, the scope decreases gradually too, and reaches a minimum at some points. The difference of heat transfer coefficient between face and back of the fins reduces as the progress of flow.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2011年第7期1052-1057,共6页
Journal of Beijing University of Technology
基金
北京市自然科学基金资助项目(3092009)
北京市属高等学校人才强教计划资助项目(PHR200906104)
北京工业大学第一届博士研究生创新计划资助项目(bcx-2009-046)
关键词
微针肋
模拟
传热特性
方肋
mirco pin fin
simulation
heat transfer characteristic
square fin
