A new model of the effect of stirring intensity on the rate of secondary nucleation
A new model of the effect of stirring intensity on the rate of secondary nucleation
复制标题
搅拌强度对二次成核速率影响的新模型
DOI：
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复制
发表时间：
1989
期刊：
影响因子：
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通讯作者：
A. Mersmann
中科院分区：
文献类型：
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作者：
R. Ploss;A. Mersmann
工业结晶器中的二次成核取决于过饱和度和搅拌产生的机械应力。考虑机械应力的大多数模型假设成核与碰撞过程中转移到晶体的能量成比例。这不是基于任何物理关系，此外，模型不能令人满意地再现实验结果。基于赫兹/胡贝尔理论的自己的模型，该模型考虑了碰撞引起的晶体应力，给出了更好的结果。这一众所周知且已被证明的理论允许计算晶体与搅拌器或壁之间碰撞期间的磨损体积。引入成核效率，可以确定由于搅拌强度和结晶器尺寸引起的机械应力对二次成核速率的影响。
Secondary nucleation in industrial crystallizers depends on both supersaturation and mechanical stress by stirring. Most models which consider mechanical stress assume that nucleation is proprotional to the energy transferred to the crystals during collisions. This is not based on any physical relationship and, in addition, the models do not satisfactorily reproduce the experimental results. Own model, based on the theory of Hertz/Huber, which accounts for the stress of the crystals caused by impact, gave better results. This well-known and proven theory allows the calculation of the volume abraded during collisions between crystals and stirrer or walls. Introducing a nucleate efficienncy, the effect of mechanical stress on the rate of secondary nucleation, due to stirring intensity and crystallizer size, can be determined.