期刊
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
卷 143, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2021.103749
关键词
Water droplet freezing; Modeling study; Gravity effect; Supercooling effect; Droplet profile; Temperature distribution
类别
资金
- National Natural Science Foundation of China [52076013]
- Beijing Municipal Science & Technology Commission [3212024]
- Open Fund of Key Laboratory of Icing and Anti/De-icing [IADL20200104]
- CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, China [CRYO202001]
- Discovery Early Career Researcher Award (DECRA) 2020, Chinese Association of Refrigeration [KT202004]
- Australian Research Council, Australia [DE200101747]
- Australian Research Council [DE200101747] Funding Source: Australian Research Council
A theoretical model was developed to investigate the freezing process of water droplets on a cold plate. Validation with experimental data showed significant improvements in accuracy, contributing to a better understanding of droplet solidification and the development of new refrigeration technologies.
Freezing of water droplet is widely seen and important in the fields of aerospace, cold energy storage, and power production. To investigate the freezing process of a sessile water droplet on a horizontal cold plate, a theoretical model was developed. Different from previously reported models, the effects of supercooling and gravity on the physical properties and the water droplet profile are both considered, respectively. This model is validated with the experimental data of two parameters, including the freezing time and the freezing front radius. The results indicate that the deviation of freezing time is decreased from 7.69% to 0.17%, while the accuracy improved by 7.52%. The average deviation of the freezing front radius is decreased from 142.90 mu m to 57.94 mu m, with the accuracy improved by 59.46%. At the freezing stage, the appearance of the dynamic growth angle contributes to the less deviation of the freezing front radius. The eccentricity of droplet shape decreases from 0.45 to 0.03, with the eccentricity decreased by 93.45%. The temperature change rates inside a droplet show a gradually decreasing tendency, and the temperatures at different droplet locations present different limiting values. The findings of this study are beneficial for understanding droplet solidification process as well as new technologies for refrigeration, deicing, and defrosting.
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