Buoyancy convection induced in a semiconductor solution by gravity fluctuations is studied numerically. Buoyancy forces based on the temperature and concentration differences are taken into account. The residual gravity is 0g and 10(exp -4)g, and the amplitude of gravity fluctuation is 10(exp -4)g and 10(exp -3)g. The frequency of gravity fluctuation is changed from 10(exp -3) Hz to 10 Hz. The effects of the amplitude and frequency of gravity fluctuation on the velocity, the temperature and concentration fields were investigated and the bifurcation diagrams are produced. Through this analysis, the following results were obtained: (1) the amplitudes of velocity, temperature and concentration fluctuations are small when the frequency of the gravity fluctuation is high but they become large when the frequency of gravity fluctuation is lower than 0.01 Hz; (2) the fluctuations of velocity, temperature and concentration deviate from sinusoidal curves and bifurcation occurs as the frequency of gravity fluctuation decreases; and (3) the amplitude of concentration fluctuations becomes smaller under residual gravity than in the absence of residual gravity.
Analyses of effects of residual accelerations and g-jitter on semiconductor melts
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