Enhancement of Single-Phase Refrigerant Mixture (R-407C) flow in Meso-Scale Heat Exchangers Using Micro-Coils
Experimental results from single-phase refrigerant mixture flow in smooth and micro-coil enhanced meso-channels are presented. R-407C -a mixture of R-32 (23％)/R-125 (25％)/R-134a (52％) - is used as the working fluid and different microcoils are used in conjunction with two meso-channels (2.78mm and 3.97 mm) to obtain distinct roughness parameters. The flow was varied over a range of Reynolds numbers andexperiments were conducted over a heat flux range of 2 to 11 Kw/m2. The heat transfer coefficient was found to be dependent on both the heat flux as well as mass flux levels. Results show that heat transfer characteristics are comparable to R-113, and that micro-coil inserts enhanced the heat transfer performance compared to the performance in smooth mesochannels.
Yasir M. Shariff T. S. Ravigururajan
Mechanical Engineering Department Taibah University Madina, Saudi Arabia Mechanical Engineering Department Wichita State University Wichita, KS USA
国际会议
海南三亚
英文
2007-01-10（万方平台首次上网日期，不代表论文的发表时间）