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《Journal of Chemical Engineering of Chinese Universities》 2007-01
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The Pulsating Feature of the Dancing Droplets and Droplet Radius Ratio of Adjacent Generations in the Fractal Model of Dropwise Condensation

LAN Zhong, MA Xue-hu, ZHOU Xing-dong, SONG Tian-yi (Institute of Chemical Engineering, Dalian University of Technology, Dalian 116012, China)  
The random motion of the droplets and the fractal characteristics of droplet sizes distribution during dropwise condensation were investigated. It is found that the motion and size distribution of droplets are related to the contact angles and the contact angle hysteresis. The relationship between the droplet radium ratio of adjacent generations in the fractal model of dropwise condensation and the contact angle hysteresis was obtained, and the calculated results agree well with the experimental data. On the surface existing contact angle hysteresis, the droplet grows up mainly by the pulsating motion, and it will cause the stepwise segment distribution of droplet sizes to occur. Furthermore, the pulsation of droplets is also affected by the inducing factors, such as the uneven distribution of the surface free energy over the condensing surface, etc., and the strong inducing effect leads to the obvious stepwise distribution of the droplet generation. The occasionality and randomicity of droplet ejections are also attributed to the droplet pulsation resulting from the contact angle hysteresis. In the formation of generation characteristic by the frequent pulsations of condensing droplets, the greater possibility is that the droplets transform from the stage with an advancing contact angle to the state with an equilibrium contact angle while the liquid volume keeps unchanged.
【Fund】: 国家自然科学基金(50376005 59906002)
【CateGory Index】: O351.1
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【References】
Chinese Journal Full-text Database 1 Hits
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【Citations】
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1 WANG Xiao-Dong1 PENG Xiao-Feng1 MIN Jing-Chun1 LJU Tao2 (1. Department of Thermal Engineering, Tsinghua University, Beijing 100084, China; 2. Department of Power Engineering, Beijing University of Aeronautics and Aerospace, Beijing 100083, China);HYSTERESIS OF CONTACT ANGLE AT LIQUID-SOLID INTERFACE[J];Journal of Engineering Thermophysics;2002-01
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【Co-citations】
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1 WANG Xiao-Dong PENG Xiao-Feng (Department of Thermal Engineering, Tsinghua, University, Heijing 100084, China);ANALYSIS OF THE DYNAMIC CONTACT ANGLE[J];Journal of Engineering Thermophysics;2003-03
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3 ZHOU Xing-dong,MA Xue-hu,LAN Zhong,SONG Tian-yi(Institute of Chemical Engineering,Dalian University of Technology,Dalian 116012,China);Falling Movement Effect of the Condensate on Condensation Heat Transfer Enhancement in the Presence of Non-condensable Gas[J];Journal of Chemical Engineering of Chinese Universities;2007-05
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【Co-references】
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1 HE Yang-Peng YAN Jun-Jie YANG Yu-Sen Liu Ji-Ping (State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China);RESEARCH ON MARANGONI CONDENSATION HEAT TRANSFER FOR WATER AND ETHANOL MIXTURE VAPOR[J];Journal of Engineering Thermophysics;2004-01
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【Secondary Citations】
Chinese Journal Full-text Database 1 Hits
1 MA Xuehu,CHEN Jiabin,XU Dunqi and LIN Jifang (Institute of Chemical Engineering,Dalian University of Technology,Dalian 116012,Liaoning,China);SURFACE FREE ENERGY DIFFERENCE CRITERION FOR CONDENSATION MODES[J];Journal of Chemical Industry and Engineering(China);2002-05
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