搅拌对冰浆存储冰晶粒径演化的影响

Effects of stirring action on ice crystal size evolution during storage

为研究搅拌作用下冰浆存储过程中冰晶粒径演化的规律,基于冰晶动力学事件核模型,利用Fluent软件、耦合多相流模型与数群平衡模型对冰浆存储过程中冰晶粒径演化进行模拟,将平均粒径模拟值与实验值进行对比分析,并对模型有效性进行验证。基于修正的冰晶动力学事件核模型对搅拌作用下冰浆存储过程中的冰晶粒径演化进行模拟,分析单螺旋桨桨叶直径及位置、双螺旋桨桨叶间距对冰浆存储过程中冰晶体积分数分布、冰晶粒径数量密度分布及冰晶平均粒径演化的影响。研究结果表明:桨叶直径对冰晶体积分数分布、冰晶粒径数量密度分布及冰晶平均粒径均有影响;桨叶间距对冰晶体积分数分布影响显著;双螺旋桨能够使蓄冰槽内冰晶分布更加均匀,更能抑制冰晶粒径增长。

In order to study the evolution of ice crystal size with stirring action during the process of ice slurry storage, the multiphase flow model and the population balance model （PBM） were coupled to simulate the evolution of ice crystal size based on the ice crystal event nucleus models, The ice crystal event nuclear model parameters were modified based on the comparison of numerical results and experiment results. The effects of the stirring action on the evolution of ice crystal size were studied by analyzing the effect of the blade size and position of single screw, the blade spacing of twin screw on the volume fraction distribution of ice crystal, number density of ice crystal size and average particle size. The results show that the blade size has influence on volume fraction distribution of ice crystal, number density of ice crystal size and average particle size, and the blade position and spacing have significant influence on volume fraction distribution. Twin screw can make the distribution of ice crystal more uniform in the storage tank, and can be more effective to inhibit the growth of ice crystal size