TY  - EJOU
AU  - Li, Y.R. 
AU  - Peng, L. 
AU  - Shi, W.Y. 
AU  - Imaishi, N. 

TI  - Convective Instability in Annular Pools
T2  - Fluid Dynamics \& Materials Processing

PY  - 2006
VL  - 2
IS  - 3
SN  - 1555-2578

AB  - The convective instabilities in semiconduc-tor or oxide melts, significantly affect the quality oflarge crystals grown from the melts by the Czochralskimethod. This paper reviewsour recent numerical stud-ies of thermal convection in annular pools of low-<i>Pr</i> sili-con melt and moderate-<i>Pr</i> silicone oil. The mechanismsof the convective instability are discussed and the criticalconditions for the onset of three-dimensional flow are de-termined. The results show that the hydrothermal wave,characterized by curved spokes, is dominant in a shallowthin pool. In a thick pool of the low-<i>Pr</i> silicon melt, thereappears a standing wave type of oscillatory longitudinalrolls, which moves in the azimuthal direction and looksvery similar to the hydrothermal waves. In deep poolsof moderate-<i>Pr</i> silicone oil, a three-dimensional steadyflow pattern, consistingof pairs of counter-rotating longi-tudinal rolls, arises, which corresponds to the Rayleigh-Benard instability
KW  - Convection
KW  -  Instability
KW  -  Numerical simulation
KW  -  Annular pool

DO  - 10.3970/fdmp.2006.002.153