Browse > Article

Characteristics on Spray Cooling Performance on the Micro-Porous Coated Surfaces  

Kim Yoon-Ho (Graduate School of Mechanical Engineering, Korea University)
Choi Chi-Hwan (Graduate School of Mechanical Engineering, Korea University)
Lee Kyu-Jung (Department of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.4, 2006 , pp. 304-311 More about this Journal
Abstract
Experiments on evaporative spray cooling on the square plate heaters with plain or micro-porous coated surfaces were performed in this study. Micro-porous coated surfaces were made by using DOM [Diamond particle, Omegabond 101, Methyl-Ethyl-Keton] method. In case of purely air-jet cooling, the micro-porous coating doesn't affect the cooling capacity. In spray cooling three different flow patterns (complete wetting, evaporative wetting, dryout) are observed on both plain and micro-porous coated surfaces. The effects of various operating conditions, such as water flow rate, particle size, and coating thickness were investigated on the micro-porous coated surfaces. It is found that the level of surface wetting is an important factor to determine the performance of spray cooling. It depends on the balance between absorbed liquid amount by capillary force over porosity and the evaporative amount. The micro-porous coated surface has largest cooling capacity, especially in the evaporative wetting zone. It is found that the effects of liquid flow rate and coating thickness are significant in evaporative wetting zone, but are not in complete wetting and dryout zones.
Keywords
Spray cooling; Micro-porous coating; Heat flux; Heat transfer coefficient;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Choi, K.J. and Yao, S. C., 1987, Mechanisms of film boiling heat transfer of normally impacting sprays, International Journal of Heat and Mass Transfer, Vol. 30, pp. 311-318   DOI   ScienceOn
2 O'Connor, J. P. and You, S. M., 1995, A painting technique to enhance pool boiling heat transfer FC-72, ASME Journal of Heat Transfer, Vol. 117, No.2, pp.387-393   DOI   ScienceOn
3 Webb, R. L., 1981, The evolution of enhanced surface geometries for nucleate boiling, Heat Transfer Engineering, Vol. 2, No. 3-4, pp. 46-69   DOI   ScienceOn
4 Bar-Cohen, A., 1997, Thermal management of microeletronics in the 21st century, IEEE/CPMT Electronic Packing Technology Conference
5 Oliphant, K., Webb, B. W. and McQuay, M. Q., 1998, An experimental comparison of liquid jet array and spray impingement cooling in the non-boiling regime, Experimental Thermal and fluid science, Vol. 18, pp. 1-10   DOI   ScienceOn
6 Kline, S. J. and McClintock, F. A., 1953, Describing uncertainties in single-sample experiments, Mech. Eng., Vol. 75, No.1, pp.3-12
7 Chang, J. Y. and You, S. M., 1997, Boiling heat transfer phenomena from micro-porous and porous surfaces in saturated FC-72, International Journal of Heat Mass Transfer, Vol. 40, No. 18, pp.4437-4447   DOI   ScienceOn
8 Fujimoto, H., Hatta, N., Asakawa, H. and Hashimoto, T., 1997, Predictable modeling of heat transfer coefficient between spraying water and a hot surface above the leidenfrost temperature, lSIJ International, Vol. 37, No.5, pp. 492-497
9 Kim, J. H., You, S. M. and Stephen, U. S. Choi, 2004, Evaporative spray cooling of plain and microporous coated surfaces, International Journal of Heat and Mass Transfer, Vol. 47, pp.3307-3315   DOI   ScienceOn
10 Mudawar, I. and Valentine, W. S., 1989, Determination of the local Quench curve for spray-cooled metallic surfaces, Journal of Heat Treating, Vol. 7, No.2, pp.107-121   DOI
11 Grissom, W. M. and Wierum, F. A., 1981, Liquid spray cooling of a heated surface, International Journal of Heat and Mass Transfer, Vol. 24, pp. 261-271   DOI   ScienceOn
12 Fujimoto, H., Hatta, N., Asakawa, H. and Hashimoto, T., 1997, Predictable modeling of heat transfer coefficient between spraying water and a hot surface above the leidenfrost temperature, lSIJ International, Vol. 37, No.5, pp. 492-497
13 Kurihari, H. M. and Myers, J. E., 1960, Effects of superheat and roughness on the boiling coefficients, AIChE J., Vol. 6, No.1, pp.83-91   DOI