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Numerical Simulation of Heat Transfer and Convection for CaF 2 Crystal Growth by Vertical Bridgman Growth Method
Author(s) -
Li Xiaohui,
Jiang Dapeng,
Wang Jingya,
Qian Xiaobo,
Liu Rongrong,
Wu Qinghui,
Zhang Zhonghan,
Su Liangbi
Publication year - 2020
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201900191
Subject(s) - crystal (programming language) , convection , crystal growth , intensity (physics) , heat transfer , materials science , temperature gradient , heat transfer coefficient , vortex , flow (mathematics) , melt flow index , absorption (acoustics) , mechanics , thermodynamics , chemistry , optics , crystallography , composite material , meteorology , physics , computer science , programming language , copolymer , polymer
Herein, simulations of heat transfer and convection for CaF 2 crystal growth are performed. Effects of internal radiation of the crystal and the melt are investigated, indicating that the temperature and flow field near the crystal–melt interface are the most affected. The temperature gradient and flow intensity near the interface have a significant change as the absorption coefficient of crystal and melt changes. Simulations at different growth stages for Nd:CaF 2 crystal are also conducted to study the evolution of the temperature field and flow field. The interface is slightly convex to the melt during the entire constant‐diameter growth stage, which coincides with the actual crystal growth result. The flow intensity is extremely strong at the top and bottom of the melt, and three different vortexes exist during the entire growth process.