International Journal of
Fluid Dynamics (2000), Vol. 4, Article 3
Effects of Space
Environment on Flow and Concentration during Directional Solidification
C.
BENJAPIYAPORN, V. TIMCHENKO, E.
LEONARDI and G. DE VAHL DAVIS
School of Mechanical and Manufacturing
Engineering,
The University of New South Wales,
Sydney, NSW, Australia
H.
C. DE GROH III
NASA Glenn Research Center,
Cleveland OH, USA
(First Received 8th February 2000;
and in revised form 15th June 2000. Published 1st August 2000.)
Abstract
A study of directional solidification
of a weak binary alloy (specifically, Bi - 1 at%* Sn) based
on the fixed grid single domain approach is being undertaken. The
enthalpy method is used to solve for the temperature field over the computational
domain including both the solid and liquid phases; latent heat evolution
is treated with the aid of an effective specific heat coefficient.
A source term accounting for the release of solute into the liquid during
solidification has been incorporated into the solute transport equation.
The vorticity-stream function formulation is used to describe thermo-solutal
convection in the liquid region.
In this paper we numerically investigate
the effects of g-jitter on directional solidification. A background
gravity of 1 mg
has been assumed, and new results for the effects of periodic disturbances
over a range of amplitudes and frequencies on solute field and segregation
have been presented.
* at% = atomic percent
Keywords
Copyright
Notice
Abstract
Next Section: Introduction
2. Mathematical
Formulation
3. Numerical
Method
4. Validation
5. Results
and Discussion
6. Conclusion
Acknowledgements
References