|
|
|
| Numerical analysis of cooling process in two-phase flow by low pressure atomization in semi-outdoor environment |
| Wang Junfeng,Tu Xincheng,Huang Qiaomei,Huang Jiwei |
| (School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China) |
|
|
|
|
Abstract In order to improve the comfort of semi-outdoor environment in summer,the cooling in two-phase flow by low pressure atomization is presented.It is an energy efficient and environmentally benign technology.The cooling process is simulated by using CFD code FLUENT.According to the climate condition in the semi-outdoor environment,the simulations are conducted for different cooling effect,each with droplet diameters of 20 micrometers and 40 micrometers.According to the character of human activity in semi-outdoor environment,the pilot analyses of the cooling effect are made.The results revealed that the evident cooling effect of two-phase flow by low pressure atomization in semi-outdoor environment could be achieved.In the perception zone of human body,the evident cooling effect is made;the cooling up to 3.5 centigrade is attained in the numerical simulation.The relative humidity in local environment does not increase evidently during the cooling process in two-phase flow by low pressure atomization,human body will not sense the dampness and swelter.All of these two types of fine water mists could evaporate,the areas of cooling and humidifier are almost the same.
|
|
Received: 23 May 2009
Published: 30 July 2009
|
|
|
|
| [1]刘乃玲,张旭,韩星.细水雾在狭长空间降温效果的数值模拟[J].建筑科学,2007,23(6):32-36.Liu Nailing,Zhang Xu,Han Xing.Numerical simulation on the cooling effect by fine mist in long and narrow space[J].Building Science,2007,23(6):32-36.(in Chinese)[2]Collin A,Boulet P,Parent G,et al.Dynamics and thermal behaviour of water sprays[J].International Journal of Thermal Sciences,2008,47:399-407.[3]Kollar L E,Farzaneh M.Modeling the evolution of droplet size distribution in two-phase flows[J].International Journal of Multiphase Flow,2007,33(11):1255-1270.[4]高建民,任宁,顾峰,等.低频超声雾化喷头优化设计及试验[J].江苏大学学报:自然科学版,2009,30(1):1-4.Gao Jianmin,Ren Ning,Gu Feng,et al.Optimum design and experiment on low-frequency ultrasonic atomizing nozzles[J].Journal of Jiangsu University:Natural Science Edition,2009,30(1):1-4.(in Chinese)[5]Sureshkumar R,Kale S R,Dhar P L.Heat and mass transfer processes between a water spray and ambient air-Ⅰ.Experimental data[J].Applied Thermal Engineering,2008,28(5-6):349-360.[6]Jia W,Qiu H H.Experimental investigation of droplet dynamics and heat transfer in spray cooling[J].Experimental Thermal and Fluid Science,2003,27(7):829-838.[7]Chen R H,Chow L C,Navedo J E.Effects of spray characteristics on critical heat flux in sub-cooled water spray cooling[J].International Journal of Heat and Mass Transfer,2002,45:4033-4043.[8]岑旗钢,王贞涛,闻建龙.切削加工喷雾冷却雾化特性的PDA试验[J].排灌机械,2007,25(3):53-56.Cen Qigang,Wang Zhentao,Wen Jianlong.Experimental study on spray characteristics for metal cutting by PDA[J].Drainage and Irrigation Machinery,2007,25(3):53-56.(in Chinese)[9]Kachhwaha S S,Dhar P L,Kale S R.Experimental studies and numerical simulation of evaporative cooling of air with a water spray-Ⅰ.Horizontal parallel flow[J].International Journal of Heat and Mass Transfer,1998,41(2):447-464.[10]Kachhwaha S S,Dhar P L,Kale S R.Experimental studies and numerical simulation of evaporative cooling of air with water spray-Ⅱ.Horizontal counter flow[J].International Journal of Heat and Mass Transfer,1998,41(2):465-474.[11]Sureshkumar R,Kale S R,Dhar P L.Heat and mass transfer processes between a water spray and ambient air-Ⅱ.Simulations[J].Applied Thermal Engineering,2008,28(5-6):361-371.[12]Sureshkumar R,Dhar P L,Kale S R.Effects of spray modeling on heat and mass transfer in air-water spray systems in parallel flow[J].International Communications in Heat and Mass Transfer,2007,34(7):878-886.[13]杨洋,黄晨,王丽慧,等.世博轴喷雾降温前期调研及试验结果分析[J].制冷技术,2008,28(1):6-10.Yang Yang,Huang Chen,Wang Lihui,et al.Analysis of research and test results of EXPO axis spray cooling[J].Refrigeration Techonology,2008,28(1):6-10.(in Chinese)[14]陶文铨.数值传热学[M].第2版.西安:西安交通大学出版社,2001:374-376.[15]王福军.计算流体动力学分析--CFD软件原理与应用[M].北京:清华大学出版社,2004:125-126. |
|
|
|
