Velocity, Temperature and Concentration Fluctuations Induced in a Binary Semiconductor Solution by g-jitter

Abstract

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 ac­ count. The residual gravity is 0 G and 10-4 G and the amplitude of gravity fluctuation is 10- 4 G and 10- 3 G. The frequency of gravity fluctuation is changed from 10- 3 Hz to 10 Hz. The effect of the am­plitude and frequency of gravity fluctuation on the velocity, temperature and concentration fields is 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 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 bifurcations occur as the frequency of gravity fluctuation decreases. (3) The amplitude of concentration fluctuations becomes smaller under residual gravity than in the absence of residual gravity. (4) The fluctuations can be reduced by applying magnetic field.