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Numerical Simulation on Effect of Rotation on Thermal Convection in a Shallow Model Czochralski Configuration with a Heated Bottom
Author(s) -
Shen Ting,
Wu ChunMei,
Li YouRong
Publication year - 2018
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.201700268
Subject(s) - rotation (mathematics) , crucible (geodemography) , convection , marangoni effect , temperature gradient , wavenumber , mechanics , heat flux , thermal , crystal (programming language) , flux (metallurgy) , convective heat transfer , materials science , optics , heat transfer , condensed matter physics , chemistry , thermodynamics , physics , meteorology , geometry , metallurgy , computational chemistry , mathematics , computer science , programming language
This paper presents a set of numerical simulations on the effect of rotation on thermal convection in a shallow model Czochralski configuration with a heated crucible bottom. Results show that when the bottom is heated by low heat flux, the temperature fluctuation can be significantly weakened and the melt can be kept from solidifying. Once the heat flux exceeds a threshold value, the thermocapillary convection will transit to the Benard–Marangoni convection. The temperature fluctuation is amplified by increasing crystal rotation rate or heat flux. The crystal rotation can restrain the azimuthal traveling of the waves. However, the propagating direction of the waves is related to the temperature gradient and the crucible rotation, and is independent of the crystal rotation. The wavenumber is reduced by the crystal rotation individually. Furthermore, the crucible rotation can reduce the effect of the crystal rotation on the wavenumber.