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Numerical Simulation of the Hydrodynamics and Mass Transfer in the Cuboid KDP Crystal Growth under the Jet-Rotating Crystal Method
Crystal Research and Technology ( IF 1.5 ) Pub Date : 2021-03-29 , DOI: 10.1002/crat.202000241
Hang Liu 1 , Mingwei Li 1 , Huawei Yin 2 , Duanyang Chen 3 , Hongji Qi 3
Affiliation  

A novel method of crystal growth by introducing jet flow to the pyramidal-restriction long-seed growth system of potassium dihydrogen phosphate (KH2PO4, KDP) in rotating crystal method, namely, the jet-rotating crystal method, is proposed. To evaluate the prospect of this new method, three-dimensional (3D) time-dependent numerical simulations of flow and mass transfer involved in the jet-rotating crystal method are conducted. Compared with the rotating crystal method, the jet-rotating crystal method can improve the magnitude and distribution homogeneity of the prismatic face supersaturation and obtain high-quality KDP crystals. The supersaturation on the prismatic face as a function of rotation rate, jet velocity, and crystal size is investigated. The effects of solution flow on mass transfer are analyzed in detail. A further improvement in the magnitude and distribution homogeneity of the prismatic face supersaturation can be observed through designing the jet flow pipes to swing periodically in vertical plane. Besides, the role of natural and forced convection in mass transport is discussed, which indicates that the effects of natural convection can be neglected when the jet velocity is equal to or greater than 0.6 m s–1.

中文翻译:

喷射旋转晶体法下长方体KDP晶体生长的流体力学和传质数值模拟

一种通过将射流引入磷酸二氢钾 (KH 2 PO 4)锥体限制长晶种生长系统的晶体生长新方法, KDP) 中的旋转晶体方法,即喷射旋转晶体方法被提出。为了评估这种新方法的前景,进行了涉及喷射旋转晶体方法的流动和传质的三维 (3D) 时间相关数值模拟。与旋转晶体法相比,射流旋转晶体法可以提高棱柱面过饱和度的大小和分布均匀性,获得高质量的KDP晶体。研究了作为旋转速率、射流速度和晶体尺寸的函数的棱柱面上的过饱和度。详细分析了溶液流动对传质的影响。通过设计射流管在垂直平面上周期性摆动,可以观察到棱柱面过饱和度的大小和分布均匀性的进一步改善。此外,讨论了自然对流和强制对流在质量传输中的作用,表明当射流速度等于或大于0.6 m s 时,自然对流的影响可以忽略不计–1 .
更新日期:2021-03-29
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