基于群体平衡模型的冰浆流动与传热特性数值研究

doi:10.16183/j.cnki.jsjtu.2019.12.008

摘要/Abstract

摘要： 冰浆作为一种固-液两相流体，由于其储能密度高、流动性及传热性能好而被广泛应用于蓄冷和冷量输送系统.结合Euler-Euler模型和群体平衡模型，考虑固-液相间作用以及固相颗粒的聚并、破碎和融化作用，在颗粒直径变化的基础上对冰浆在水平圆管内的流动与传热特性进行数值研究.研究结果表明：冰浆固相颗粒直径的变化与固相体积分数的变化呈正相关，较大的流速有利于颗粒直径的增大.在入口流速为10m/s与固相体积分数为10%的流动工况下，固相颗粒的直径最大值可从初始状态的125μm增长到139μm.相同流动条件下，当壁面热流密度为50kW/m2时，固相颗粒的直径可从初始状态的270μm直至完全融化，热流密度的增大会加快颗粒直径的减小，颗粒直径分布表现出与等温流动工况不同的特性.

关键词: 固-液两相流；群体平衡模型；冰浆；流动与传热

Abstract: As a solid-liquid two-phase fluid, ice slurry is widely used in cold storage and transport systems due to its high energy storage density, good fluidity and heat transfer performance. Most of the studies on the flow and heat transfer characteristics of ice slurry are based on uniform particle diameter. In the present study, the flow and heat transfer characteristics of ice slurry are numerically investigated in horizontal circular pipes based on the variation of particle diameter through the Euler-Euler two-phase flow model with population balance model (PBM), which considers the interaction between the solid and liquid phases as well as the aggregation, breakage and melting of particles. The results show that the ice particle diameter increases with the increase of solid volume fraction and flow rate. The particle diameter changes from 125μm to 139μm at solid volume fraction of 10% and inlet velocity of 10m/s under the isothermal flow condition. Whereas the particle diameter gradually decreases from the initial diameter to completely melting at wall heat flux of 50kW/m2. Increasing the heat flux leads to a faster decrease of particle diameter and the particle diameter distribution is different from that under the isothermal flow condition.

Key words: solid-liquid two-phase flow; population balance model; ice slurry; flow and heat transfer

中图分类号:

TK 02
TB 64

邹良旭，马非，孟昭男，张鹏. 基于群体平衡模型的冰浆流动与传热特性数值研究[J]. 上海交通大学学报, 2019, 53(12): 1459-1465.

ZOU Liangxu，MA Fei，MENG Zhaonan，ZHANG Peng. Numerical Investigation of Flow and Heat Transfer of Ice Slurry Based on Population Balance Model[J]. Journal of Shanghai Jiaotong University, 2019, 53(12): 1459-1465.

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