| 摘要: |
| 本文采用实验研究与数值模拟相结合的方法，研究了冰浆在水平直管内流动过程中冰晶粒径的分布及其演化规律。通过CFD-PBM耦合模型模拟研究冰浆在不同过冷度、流速、含冰率下冰晶粒径分布及其演化规律，并通过实验对数值模拟结果进行验证。结果表明：在含冰率为15%的冰浆管道入口处，冰晶粒径数量密度分布均近似高斯分布；随着冰浆流速和含冰率的增加，沿流动方向中心轴的冰晶平均粒径增大，截面冰晶粒径分布越不均匀；流速越小、含冰率越大，冰晶粒径的长度数量密度分布曲线的峰值升高，峰值所对应冰晶粒径的平均值减小。 |
| 关键词: 冰浆 CFD-PBM耦合模型 动力学模型 数值模拟 冰晶粒径 |
| DOI： |
| 投稿时间：2019-03-25 修订日期：2019-05-07
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| 基金项目:国家自然科学基金 (51676209) ,中南大学中央高校基本科研业务费专项资金 (2018zzts489) 资助。 |
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| Investigation on the Evolution of Ice Crystal Size during Ice Slurry Flowing in Horizontal Straight Pipes |
| Yu Yunxia,Liu Zhiqiang,Tang Yifang,Ma Kebo |
| (School of Energy Science and Engineering, Central South University) |
| Abstract: |
| In order to study the evolution of the size of ice crystal during its flow in horizontal straight pipes, both experiment research and numerical simulation were performed in this study. The size distribution and evolution of ice crystals for different sub-cooling degrees, flow velocities, and Ice Packing Fractions (IPF) were studied by numerical simulation using the CFD-PBM coupling model, and the numerical simulation was then verified by experiment. The results show that the distribution of ice number density could be approximately described by Gaussian distribution at the entrance of the ice slurry pipe with an IPF of 15%. With the increase in velocity and IPF, the average size of ice crystal increases along the central axis. Additionally, the size distribution of ice crystals gets more uneven along the vertical direction. With the decrease of flow velocity and the increase of IPF, the peak value of the length number density distribution of the ice crystal’s particle size increases, and the average value of the corresponding ice crystal’s particle size decreases. |
| Key words: ice slurry CFD-PBM coupled model kinetic model numerical simulation ice crystal size |
