碰撞成核过程的研究
首发时间:2008-11-20
摘要:本文从单个晶体运动中与结晶器内其它晶体及固体壁面碰撞过程的能量损失角度描述了碰撞成核过程,建立了晶体粒径与成核速率的理论关系模型。结果表明晶体的粒度对碰撞成核速率有很大的影响。并利用氯化钠晶体进行了碰撞成核试验,使用理论模型对实验结果进行拟合,进而验证了理论模型所预期的规律。同时探讨了母晶对碰撞后晶体碎片的影响,指出在分析二次成核时,应充分考虑晶体粒度对成核影响的重要作用。该理论模型为实现工业结晶过程的仿真模拟奠定基础提供了依据。
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A study on the collision nucleation processes
Abstract:A theoretical model of collision nucleation rate with consideration of particle size was developed based on the energy lose during the collision between a single crystal with other crystals and the walls in the crystallizer. It is shown that particle size is a significant factor in affecting the collision nucleation rate. The experiments on the collision nucleation were carried out with sodium chloride crystals. The expected law of theoretical model was proved by experimental results. At the same time, the effect of the crystal size on the distribution of nuclei was discussed. It is concluded that crystal size should be fully considered in analysis the secondary nucleation. The model provides a fundamental consideration in nucleation process in the CFD simulation of industrial crystallization.
Keywords: Industrial crystallization Crystallization kinetics Secondary nucleation
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No.2591936230012271****
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