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Studies on macrosegregation and double diffusive convection during directional solidification of binary mixture.
- Source :
-
Materials Science & Technology . Oct2008, Vol. 24 Issue 10, p1230-1237. 8p. 1 Black and White Photograph, 5 Diagrams, 1 Chart, 7 Graphs. - Publication Year :
- 2008
-
Abstract
- Experimental and numerical studies on macrosegregation during directional solidification of an aqueous ammonium chloride solution in a rectangular cavity are presented. Depending on the initial concentration and boundary temperature conditions, three distinct situations in the liquid during the solidification process are studied: mass diffusion only, solutal convection and double diffusive convection. The time dependent concentration of the solution inside the cavity is measured online for the above three situations using a laser based technique. This technique measures refractive index of the solution, which indirectly gives the concentration variation at a point in the solution during solidification. The interface growth is photographed using a shadowgraph technique, and the flow is visualised using a sheet of laser light scattered by neutrally buoyant, hollow glass spheres seeded in the fluid. Corresponding numerical studies are performed using a macroscopic model based on a fixed grid, enthalpy based, control volume approach. A good agreement between the experimental and computational results is observed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02670836
- Volume :
- 24
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Materials Science & Technology
- Publication Type :
- Academic Journal
- Accession number :
- 34888589
- Full Text :
- https://doi.org/10.1179/174328407X185901