Heat Transfer Enhancement in Microchannel Heat Sinks Using Nanofluids

摘要：

Heat transfer enhancement in a 3-D microchannel heat sink (MCHS) using nanofluids is investigated by a numerical study. The calculations suggest that the best heat transfer enhancement can be obtained by using a system with an Al2O3–water nanofluid-cooled MCHS. Moreover, using base fluids with lower dynamic viscosity (such as water) and substrate materials with high thermal conductivity enhance the thermal performance of the MCHS. The results also show that as the particle volume fraction of the nanofluid increases, the thermal resistance first decreases and then increases. The lowest thermal resistance can be obtained by properly adjusting the volume fraction and pumping power under given geometric conditions. For a moderate range of particle sizes, the MCHS yields better performance when nanofluids with smaller nanoparticles are used. Furthermore, the overall thermal resistance of the MCHS is reduced significantly by increasing the pumping power. The heat transfer performance of Al2O3–water and diamond–water nanofluids was 21.6％ better than that of pure water.

关键词： microchannel heat sink nanofluid overall thermal resistance thermal performance

作者: Tu-Chieh Hung Yong-Hao Siao Wei-Mon Yan Xiao-Dong Wang Chun-Yen Chang

作者单位: Department of Mechanical Engineering, R.O.C Military Academy, Kaohsiung 83059, Taiwan Department of Greenergy, National University of Tainan, Tainan70005, Taiwan Beijing Key Laboratory of New and Renewable Energy, North China Electric Power University, Beijing 1

会议类型: 国际会议

会议名称: 4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)

会议地点: 广州

会议语种:英文

页码: 1-5

在线出版日期: 2012-01-06（万方平台首次上网日期，不代表论文的发表时间）