Oscillatory convection in a spherical cavity due to g-jitter
Abstract
The convection caused by residual acceleration in axial direction in a spherical cavity heated at the equator and cooled at the poles is investigated. The spherical cavity is used as a first order model of the melting zone in a typical crystal growth experiment under microgravity. The resulting shift of the isotherms is calculated. If in order to avoid striations of the growing crystal a shift of the solidification isotherm by 1 micron is required, the amplitude of residual accelerations of 1 and 10 Hz must be 0.000001 and 0.0001 g respectively.
- Publication:
-
Mater. Sci. under Microgravity
- Pub Date:
- June 1983
- Bibcode:
- 1983msum.rept..359L
- Keywords:
-
- Crystal Growth;
- Free Convection;
- Gravitational Effects;
- Oscillating Flow;
- Reduced Gravity;
- Vibration Effects;
- Microgravity Applications;
- Navier-Stokes Equation;
- Simulation;
- Space Commercialization;
- Striation;
- Temperature Distribution;
- Weightlessness;
- Fluid Mechanics and Heat Transfer