| 摘要: |
| 为获得真空法制得冰浆中冰晶的平均粒径及粒径分布规律，本文以乙二醇水溶液为制冰溶液，采用真空法制备得到冰浆，并通过显微装置观测冰浆中的冰晶形态。实验分别研究了搅拌速率、乙二醇初始浓度和含冰率（IPF）对冰晶平均粒径的影响，并将实验得到的粒径分布与正态分布、对数正态分布、伽马分布和威尔布分布进行对比。结果表明：不同实验条件下冰浆中冰晶粒径分布均可统一用伽马分布来描述；搅拌速率对冰晶平均粒径几乎无影响；冰晶平均粒径随溶液初始浓度的增大而减小，当乙二醇浓度从1%提高至7%时，冰晶平均粒径从74.8 μm降至34.3 μm；含冰率达到一定大小时，才会对冰晶平均粒径产生较显著的影响，表现为含冰率越高，平均粒径越大。 |
| 关键词: 粒径分布 实验研究 冰浆 真空制冰 |
| DOI： |
| 投稿时间：2016-09-29
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| 基金项目:国家基础科学人才培养基金（J1103303）资助项目。 |
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| Experimental Study on the Characterisation of Ice Particle Size in Ice Slurry Produced by Vacuum Method |
|
Liu Xi1, Zheng Minfeng2, Ge Zhoutian1, Chen Junhan1, Li Xuelai1
|
| (1.School of Chemical Engineering, Fuzhou University;2.College of Ecological Environment and Urban Construction, Fujian University of Technology) |
| Abstract: |
| To obtain its average particle size and size distribution, ice slurry treated with ethylene glycol was produced through a vacuum method, and images of ice particles in the ice slurry were obtained using a microscopic observation system. The effects of the stirring speed, initial ethylene glycol concentration, and ice packing fraction (IPF) on the average particle size were investigated experimentally. Meanwhile, the experimental particle size distributions were also compared with normal, log-normal, Gamma, and Weibull distributions. The results indicate that the size distributions of the ice particles under different experiment conditions were in accordance with the Gamma distribution. The average particle size of the ice crystals measured at five stirring speeds of 100, 200, 300, 400, and 500 r/min were 46.5, 46.0, 44.0, 44.2, and 45.2 μm, respectively, which indicates that the stirring speed has little influence on the average particle size. The higher the concentration of ethylene glycol, the smaller the average particle size, which was decreased to 74.8 μm from 34.3 μm when the concentration of ethylene glycol was varied from 1% to 7%. Moreover, the average particle size of the ice crystals increased with an increase in the ice packing fraction. However, the amplitude was not clear until the ice packing fraction reached a certain threshold of about 18%. |
| Key words: particle size distribution experimental study ice slurry vacuum ice |
