A semi-empirical model describing the heat transfer characteristics of the pseudo-dropwise condensation of binary vapor on a cooled vertical tube has been formulated. By ignoring the thin film always present on the condensation surface and the intensification of mass transfer caused by the Marangoni effect, the heat transfer characteristics of pseudo-dropwise condensation are tentatively formulated. The model involved an analysis of the diffusion process in the vapor boundary layer along with the heat transfer process through the condensate drops. This model was applied to the condensation of the saturated binary vapor of ethanol and water, and was examined using experimental data at vapor pressure values of 101.33 kPa (provided by Utaka and Wang, 2004, “Characteristic Curves and the Promotion Effect of Ethanol Addition on Steam Condensation Heat Transfer,” Int. J. Heat Mass Transfer, 47, pp. 4507–4516), 84.52 kPa and 47.36 kPa. Calculations using the model show a similar trend to the experimental measurements. With the change of the vapor-to-surface temperature difference, the heat transfer coefficients revealed nonlinear characteristics, with the peak values under all ethanol mass fractions of binary vapor. The heat transfer coefficients increased with decreasing ethanol mass fraction.
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e-mail: yanjj@mail.xjtu.edu.cn
e-mail: gwang@uakron.edu
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A Semi-Empirical Model for Condensation Heat Transfer Coefficient of Mixed Ethanol-Water Vapors
JinShi Wang,
JinShi Wang
State Key Laboratory of Multiphase Flow in Power Engineering,
e-mail: yanjj@mail.xjtu.edu.cn
Xi’an Jiaotong University
, Xi’an City 710049, P.R. China
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GuoXiang Wang
GuoXiang Wang
Department of Mechanical Engineering,
e-mail: gwang@uakron.edu
University of Akron
, Akron, OH 44325-3903
Search for other works by this author on:
JinShi Wang
State Key Laboratory of Multiphase Flow in Power Engineering,
Xi’an Jiaotong University
, Xi’an City 710049, P.R. Chinae-mail: yanjj@mail.xjtu.edu.cn
GuoXiang Wang
Department of Mechanical Engineering,
University of Akron
, Akron, OH 44325-3903e-mail: gwang@uakron.edu
J. Heat Transfer. Jun 2011, 133(6): 061501 (11 pages)
Published Online: March 2, 2011
Article history
Received:
October 4, 2009
Revised:
January 5, 2011
Online:
March 2, 2011
Published:
March 2, 2011
Citation
Li, Y., Yan, J., Wang, J., and Wang, G. (March 2, 2011). "A Semi-Empirical Model for Condensation Heat Transfer Coefficient of Mixed Ethanol-Water Vapors." ASME. J. Heat Transfer. June 2011; 133(6): 061501. https://doi.org/10.1115/1.4003433
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