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Crystals 2017, 7(5), 128; doi:10.3390/cryst7050128

Determination of Supercooling Degree, Nucleation and Growth Rates, and Particle Size for Ice Slurry Crystallization in Vacuum

School of Chemical Engineering, Fuzhou University, Fuzhou 350116, China
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Academic Editors: Helmut Cölfen and Mei Pan
Received: 7 April 2017 / Revised: 28 April 2017 / Accepted: 29 April 2017 / Published: 5 May 2017
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Abstract

Understanding the crystallization behavior of ice slurry under vacuum condition is important to the wide application of the vacuum method. In this study, we first measured the supercooling degree of the initiation of ice slurry formation under different stirring rates, cooling rates and ethylene glycol concentrations. Results indicate that the supercooling crystallization pressure difference increases with increasing cooling rate, while it decreases with increasing ethylene glycol concentration. The stirring rate has little influence on supercooling crystallization pressure difference. Second, the crystallization kinetics of ice crystals was conducted through batch cooling crystallization experiments based on the population balance equation. The equations of nucleation rate and growth rate were established in terms of power law kinetic expressions. Meanwhile, the influences of suspension density, stirring rate and supercooling degree on the process of nucleation and growth were studied. Third, the morphology of ice crystals in ice slurry was obtained using a microscopic observation system. It is found that the effect of stirring rate on ice crystal size is very small and the addition of ethylene glycoleffectively inhibits the growth of ice crystals. The results in this paper can provide theoretical guidance and technical support for the development of vacuum icemakers. View Full-Text
Keywords: ice slurry; supercooling degree; nucleation rate; growth rate; particle size ice slurry; supercooling degree; nucleation rate; growth rate; particle size
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Liu, X.; Zhuang, K.; Lin, S.; Zhang, Z.; Li, X. Determination of Supercooling Degree, Nucleation and Growth Rates, and Particle Size for Ice Slurry Crystallization in Vacuum. Crystals 2017, 7, 128.

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