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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v16.i1.50
pages 61-71

Theoretical Study of Dropwise Condensation Heat Transfer: Effect of the Liquid-Solid Surface Free Energy Difference

Zhong Lan
Institute of Chemical Engineering, Dalian University of Technology, Dalian 116012 China
Xuehu Ma
Institute of Chemical Engineering, Dalian University of Technology, Dalian 116012 China
Xing-Dong Zhou
Institute of Chemical Engineering, Dalian University of Technology, Dalian 116012 China
Mingzhe Wang
Institute of Chemical Engineering, Dalian University of Technology, Dalian 116012, Liaoning, China

ABSTRACT

Dropwise condensation heat transfer depends not only on the condensing conditions, but also on the interfacial phenomena between the condensate and the condensing surface, expressed as the surface free energy difference between the condensate and the condensing surface. A model was developed based on the well-established Rose's model with consideration of the interfacial interaction between the condensate and the condensing surface, and by rebuilding the spacial drop-size distribution into the time domain. Simulation results indicate that the heat transfer coefficient increases as the surface free energy difference increases and the contact angle hysteresis decreases. Larger contact angles and smaller departure diameters result in higher heat transfer coefficients. Simulation results for the selected solid-liquid-vapor system are in good agreement with experimental data, the predictions of Rose's model and experimental data in the literature.