Numerical Simulation of Flow and Mass Transfer for Small-size KDP Crystals Grown by 2D Translation Method
YIN Huawei1, HU Chuanbo1,2, YAO Xin1, CHEN Qiya1, HU Lei1, LU Zenghui3
1 Key Laboratory of Water Environment Evolution and Pollution Control in Three Gorges Reservoir; School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404000, China 2 HKBU Faculty of Science, Hongkong 999077, China 3 Wanzhou Ecological Environmental Monitoring Station, Chongqing 404000, China
Abstract: Anovel technique of crystal growth named 2D translation method is proposed. In this method, the crystal is periodically translated according to the scheduled path instead of reversal rotation. Numerical simulations of the growth process of the small-size KDP single crystal via 2D translation method were carried out. The fluid flow and surface supersaturation distribution are obtained as functions of the translational velocity, distance, impacted angle of crystals. Results indicate that surface supersaturation increases with an increase in translational velocity. However, the change in the structure of the flow field is not pronounced. With increased translation distance, the mean value of surface supersaturation gradually decreases, whereas standard deviation increases, which is detrimental to the homogeneity of surface supersaturation. Impacted angle considerably affects the distribution of the prismatic surface supersaturation and the symmetry of the flow field. Results show that it is more favorable for crystal growth when the impacted angle is 45°. The simulation for step propagation shows that the non-uniform distribution of surface supersaturation can give rise to step bending and bunching. 2D translation method is more conducive to the steady step migration, which is expected to improve the morphology stability and crystal quality.
尹华伟, 胡传波, 姚鑫, 陈琪雅, 胡雷, 卢增辉. 二维平移法小尺寸KDP单晶生长溶液流动与传质模拟[J]. 材料导报, 2021, 35(12): 12032-12038.
YIN Huawei, HU Chuanbo, YAO Xin, CHEN Qiya, HU Lei, LU Zenghui. Numerical Simulation of Flow and Mass Transfer for Small-size KDP Crystals Grown by 2D Translation Method. Materials Reports, 2021, 35(12): 12032-12038.
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2021, Vol. 35 
