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ISRN Chemical Engineering
Volume 2012 (2012), Article ID 789489, 7 pages
http://dx.doi.org/10.5402/2012/789489
Research Article

Effect of Contact Angle on Steam Dropwise Condensation: A Simulation Approach

Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran

Received 22 January 2012; Accepted 14 February 2012

Academic Editors: C.-T. Hsieh and M. E. R. Shanahan

Copyright © 2012 Milad Nahavandi and Arjomand Mehrabani-Zeinabad. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dropwise condensation process on surface of a vertical polytetrafluouroethylene (PTFE) plate at atmospheric pressure was simulated. Comparison of simulated data with experimental and theoretical results indicates that performed simulation results confirm experimental data, although they deviated from existing proposed correlations. For calculation of heat transfer coefficient and droplets size distribution, simulation of condensation process over vertical copper and PTFE surfaces at atmospheric pressure was performed. By considering the effect of contact angle on heat transfer resistances of droplets, the gained data were optimized in order to evaluate droplets size distribution coefficient. This distribution coefficient was used in a new correlation for prediction of heat transfer coefficient for dropwise condensation process. Comparison of experimental results with the correlation shows a good agreement, 11% relative error.