The effect of the impleller speed on the product crysal size distibution (CSD) a 22 liter draft tube (DT) crysallizer

Andreas M. Neumann; Sean K. Bermingham; Herman J.M. Kramer

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The effect of the impleller speed on the product crysal size distibution (CSD) a 22 liter draft tube (DT) crysallizer

机译：叶轮速度对22升引流管（DT）结晶器产品结晶尺寸分布（CSD）的影响

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In draft tube (DT) crystallizers secondary nuclei originate predominantly from collisions between crystals and the impeller. The fromation step of these nuclei is a complex process deepnding onthe attriion behavior of the crystalline material and the two-phase flow pattern in the vicinity of the impleller. In order to develop crysatllizer models with a predicitive value for different operational conditions or for differnet scale sof operation a mechanistic description of the secondary nucleation rate is a prerequisite. In this paper the predictive capabiltiy of a mechanistic model framework was studied by comparing the dynamic trend of the predicted median crysal size L_50 withthe experimentally obtained one. The model is in good agreemetn with the experimentla data regarding the predicted steady-state L_50 and the amplitude of the start-up oscillation. The dynamic bhavior predicted by the model, however, differs from the measured one regarding the oscilltion frequency and pahse forr resons tht will be addressed in the futrue.

机译：在尾流管（DT）结晶器中，次核主要来自晶体和叶轮之间的碰撞。这些原子核的形成步骤是一个复杂的过程，它加深了晶体材料的磨损行为和叶轮附近的两相流模式。为了开发具有针对不同操作条件或不同净规模的操作的预测值的晶化器模型，必须对次级成核率进行机械描述。本文通过比较预测的中值眼泪大小L_50的动态趋势与实验获得的模型，研究了机械模型框架的预测能力。该模型与关于预测稳态L_50和启动振荡幅度的实验数据非常吻合。然而，该模型预测的动态行为与测得的振荡频率有所不同，并且未来的帕氏共振将得到解决。

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《Journal of Crystal Growth》 |1999年第1期|p.723-728|共6页
作者
Andreas M. Neumann; Sean K. Bermingham; Herman J.M. Kramer;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
中图分类晶体学;
关键词
Ammonium sulfate; Crystal size distribution; Attrtion; Secondry nucleation;

机译：硫酸铵;晶体尺寸分布;损耗二次成核;

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The effect of the impleller speed on the product crysal size distibution (CSD) a 22 liter draft tube (DT) crysallizer

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