A model for droplet evaporation near Leidenfrost point |
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Authors: | Heng Xie Zhiwei Zhou |
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Affiliation: | a103 Division, Energy Science Building, Institute of Nuclear Energy Technology, Tsinghua University, Beijing 100084, PR China |
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Abstract: | The droplet evaporation process after impinging on a solid wall near Leidenfrost point is theoretically analyzed. Considering the change of heat transfer effective in the evaporation process, it is divided into recoil stage and spherical stage, and the heat transfer models in these two stages are built, respectively. The effect of initial Weber number, initial droplet diameter, solid surface superheat and wettbility are included in the models. A correlation for predicting evaporation lifetime is obtained based on the theoretical analysis and experimental results. By comparing analysis results with experimental data, it is concluded that the evaporation process can be predicted by present model. The results imply that Leidenfrost point may be not the turning point of heat transfer mechanism. The effect of drop size and Weber number are also analyzed. |
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Keywords: | Leidenfrost temperature Evaporation Drop impingement Theoretical analysis |
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