The effects of micro-structured surfaces on multi-nozzle spray cooling |
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| Affiliation: | 1. Institute of Engineering Thermophysics, University of Chinese Academy of Sciences, P.O. Box 2706, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore;2. Temasek Laboratories @ NTU, Singapore;3. DSO National Laboratories, Singapore;1. Department of Mechanical Engineering, 427 UCB University of Colorado, 1111 Engineering Drive, Boulder, CO 80309-0427, USA;2. National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO 80401, USA;1. RINI Technologies, Inc., 582 S. Econ Circle, Oviedo, FL 32765, United States;2. Department of Mechanical and Chemical Engineering, North Carolina A&T State University, Greensboro, NC 27411, United States;3. Department of Materials Science and Engineering, Advanced Materials Processing Analysis Center, Nanoscience Technology Center, University of Central Florida, Orlando, FL 32816, United States;4. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, United States |
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| Abstract: | Experiments were conducted to investigate heat transfer characteristics of spray cooling with eight nozzles for micro-structured surfaces included cubic pin fins and straight pin fins of different sizes. Liquid volume flow rate ranged from 2.46 × 10−2 m3/s/m2 to 3.91 × 10−2 m3/s/m2 and the corresponded inlet pressures changed from 0.28 MPa to 0.6 MPa by keeping the inlet water temperature between 20.4 °C and 24.31 °C. And the input power of heat block varied from 180 W to 1080 W. The results show that the heat transfer performances of straight fins2 and straight fins3 are the best in single phase zone, but the cubic pin fins is better in two phase zone. Notably, the critical point between single phase zone and two phase zone shifts to left with the increasing of liquid volume flow rate. Moreover, with the liquid volume flow rate increasing, the heat transfer coefficient increases as well, but straight fins1 and polished surface are not sensitive to this change. For a deeper analysis of the heat transfer enhancement, a dimensionless number (DM) is created to characterize heat transfer performance of different microstructures in single phase heat transfer. We verified the dimensionless number using experimental results in this study and previous literature. Furthermore, the micro-structured surfaces have negligible effects on temperature distribution except for cubic pin fins. |
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| Keywords: | Micro-structured surface Multi-nozzle spray cooling Heat transfer Temperature uniformity |
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