| 摘要: |
| 本文实验研究了流速为1.0~2.5 m/s、质量含冰率为10%~30%、初始粒径为350~550 μm条件下的冰晶粒径演化规律，分析了流速、冰晶颗粒浓度及初始粒径对冰晶粒径演化规律的影响。结果表明：过冷法制备的冰晶粒径分布符合对数正态分布；在湍流条件下，出口平均粒径明显小于进口，表明破碎比团聚对冰晶粒径演化的影响显著，使大粒径冰晶颗粒减少，小粒径冰晶颗粒增多；大粒径的冰浆颗粒更容易破碎成小粒径颗粒，并且随着流速的增大冰晶粒径破碎作用更显著。当质量含冰率为10%，速度由1.0 m/s增至2.5 m/s时，进出口平均粒径差（Δd32）由16.1 μm增至34.6 μm，这对冰浆的安全输运具有重要的指导价值。 |
| 关键词: 冰浆 粒径演化 团聚 破碎 |
| DOI： |
| Received:July 05, 2022Revised:October 21, 2022 |
| 基金项目:中国石油大学（北京）克拉玛依校区科研启动基金（XQZX20220013），新疆维吾尔自治区自然科学基金（2022D01F39）和湖南省教育厅科学基金（20C0651）资助。 |
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| Experimental Study of Evolution of Ice Crystal Size in Turbulent Flow of Ice Slurry |
|
Cai Lingling1, Mi Sha1, Liu Zhiqiang2
|
| (1.State Key Laboratory of Heavy Oil Processing, China University of Petroleum-Beijing at Karamay;2.School of Energy Science and Engineering, Central South University) |
| Abstract: |
| Experiments were conducted with flow rates between 1.0 m/s and 2.5 m/s, ice mass fractions between 10% and 30%, and initial particle sizes between 350 μm and 550 μm to study the effects of these parameters on the evolution of ice crystal size in ice slurry isothermal flow. The results indicated that the ice particle-size distribution of the ice slurry prepared using a supercooling method presented a lognormal distribution. Under turbulent conditions, the Sauter mean diameter at the outlet was significantly smaller than that at the inlet. This indicates that the effect of breakage on the ice particle-size distribution was more significant than that of aggregation, resulting in an increase in small ice particles and a decrease in large ice particles. Large ice particles are more likely to break into smaller particles; the effect of breakage becomes more significant with an increase in the flow rate. With an ice mass fraction of 10%, the velocity increased from 1.0 m/s to 2.5 m/s, and the Sauter mean diameter difference between the inlet and outlet (Δd32) increased from 16.1 μm to 34.6 μm. These findings have significance in the safe transportation of ice slurries. |
| Key words: ice slurry particle-size evolution aggregation breakage |
