naa a22 4500 510766331 CHVBK 20180411083158.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11630-013-0611-4 doi (NATIONALLICENCE)springer-10.1007/s11630-013-0611-4 Visualization of film wavelike characteristics and measurement of film thickness in spray cooling [Elektronische Daten] [Yan Hou, Yujia Tao, Xiulan Huai] An experimental investigation was performed to study the heat transfer in an eight-nozzle spray cooling system with de-ionized water as the working fluid. Visualization of the liquid-solid contact area and the flow near the heated surface was made using a microscopic lens system in conjunction with an advanced high-speed camera. The film thickness and film wavelike characteristics under liquid volume flow rates ranged from 2.78×10−6 m3/s to 1.39×10−5 m3/s and surface temperatures between 22°C and 78.2°C were examined respectively. The development process of the liquid film on the heated surface was observed. The local mean film thickness, the film wavelike characteristics and the behavior of the bubbles appeared in the liquid film were captured using an image processing technique. It is discovered that there exists a climax of local mean film thickness during the starting process of spray cooling. When the liquid film reaches the dynamic stable state, the dimensionless mean film thickness decreases with the increase of the liquid volume flow rate, and increases with the increase of surface temperature generally. Besides, the volume flow rate has a more significant impact on the wavelength and amplitude of the liquid film compared to the surface temperature. Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg, 2013 Spray cooling nationallicence Visualization nationallicence Film thickness measurement nationallicence Film wavelike characteristics nationallicence Hou Yan Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut Tao Yujia Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut Huai Xiulan Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut Journal of Thermal Science SP Science Press 22/2(2013-04-01), 186-195 1003-2169 22:2<186 2013 22 11630 https://doi.org/10.1007/s11630-013-0611-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11630-013-0611-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hou Yan Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut NATIONALLICENCE 700 1- Tao Yujia Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut NATIONALLICENCE 700 1- Huai Xiulan Institute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, 100190, Beijing, China aut NATIONALLICENCE 773 0- Journal of Thermal Science SP Science Press 22/2(2013-04-01), 186-195 1003-2169 22:2<186 2013 22 11630 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer