Abstract
In this paper, a model was developed to predict the heat transfer characteristics of Marangoni dropwise condensation. In accordance with the feature of Marangoni condensation, condensation was treated as dropwise condensation of mixture vapors. The condensation space was divided into two parts: the vapor diffusion layer and the condensate layer. For the condensate layer, the classical heat transfer calculation method of dropwise condensation was imitated to obtain the heat transfer characteristics. For the vapor diffusion layer, the heat transfer characteristics were achieved by solving the conservation equations. These heat transfer characteristics were coupled through the conjunct boundary, which was the vapor-liquid interface. The model was applied to the condensation of water-ethanol mixture vapors. A comparison with the existing experimental data showed that the developed model could basically reflect the influences of vapor-to-surface temperature difference, vapor concentration, vapor pressure, and vapor velocity on heat transfer characteristic of Marangoni condensation. Results showed that some differences existed between the calculation results and experimental results, but the prediction deviation of the model could be acceptable in the range of vapor-to-surface temperature difference where the condensation heat transfer coefficients reached peak values.
Highlights
The condensation process usually occurs in many industrial applications and is usually divided into filmwise condensation and dropwise condensation in accordance with the condensation modes.The heat transfer coefficients of dropwise condensation are much higher than those of filmwise condensation, which is why increasing attention has been paid to achieve dropwise condensation in recent years
The heat transfer characteristics of the condensate layer with drops could be obtained by using the classical heat transfer calculation method of dropwise condensation, and the heat transfer characteristics of the vapor diffusion layer could be achieved by solving the conservation equations
The heat transfer model presented in this paper is for the Marangoni condensation of the
Summary
The condensation process usually occurs in many industrial applications and is usually divided into filmwise condensation and dropwise condensation in accordance with the condensation modes. By applying long-wave approximation, Kanatani [26] studied the instability of the condensate film in a binary vapor mixture system and found that the effect of temperature on condensation transfer coefficient could not be neglected in the condensation of a water-ethanol system. Li et al [29] proposed a semi-theoretical model to predict the condensation heat transfer characteristic of ethanol-water mixtures. In this model, the liquid-vapor interface temperature was assumed as. Wang et al.developed [31] introduced correlation of Marangoni forheat water-ethanol mixture, and the influencing deviation between dimensionless numbers condensation to represent the transfer results and essential factors ofthe experimental results and the prediction results ranged from. Operating conditions and the design of compact condensers to enhance heat transfer
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