Enhanced Condensation Heat Transfer for Dielectric Fluid within Micro-Channel Heat Sink

• Main Authors: Lin, Kuo-Wei, 林國緯
• Other Authors: Wang, Chi-Chuan
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/92677114415532361377

碩士 === 國立交通大學 === 機械工程系所 === 103 === This study experimentally investigates the condensation of HFE-7100 within a multiport micro-channel heat sink with a hydraulic diameter of 800 μm and fixed the outlet pressure at 110 kPa, condensation heat flux at 25 kW/m2s. The condensation tests are carried out having mass fluxes ranging from 100 to 300 kg/m2s, vapor mass quality from 0.1 to 0.9 and inclined arrangement from -90° (vertical downward) to 90° (vertical upward). In addition, the present study propose a novel concept to enhance the condensation heat transfer performance by proposing a micro-drainage channel sitting near the corner of the conventional microchannel. Through this design, the condensate will be pulled into the drained channels, thereby resulting in reducing the liquid film thickness and enhancing the two phase heat transfer performance accordingly. The results show that the micro-channel heat sink with drained channels can enhance the heat transfer coefficient about 7.3%. In addition, the frictional pressure gradient will be decreased about 13.6%.