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International Journal of Fluid Mechanics Research
ESCI SJR: 0.22 SNIP: 0.446 CiteScore™: 0.5

ISSN Print: 2152-5102
ISSN Online: 2152-5110

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i1-3.70
pages 75-85

Time Evolution of Double-Diffusive Convection during Solidification of a Binary System

Tatsuo Nishimura
Department of Mechanical Engineering, Yamaguchi University, Ube 755, Japan
T. Imoto
Department of Mechanical Engineering, Yamaguchi University, Ube, Japan
H. Miyashita
Department of Materials Science and Engineering, Toyama University, Toyama, Japan

ABSTRACT

This manuscript describes time-evolution of double-diffusive cells during solidification of NH4Cl−H2O system in a confined cavity with lateral cooling. Time-dependent concentration measurements show a step change of concentration with time, and temperature visualizations reveal a S-shaped profile of isotherms. Although the cells move vertically and the thickness of each cell increases, the concentration in each cell is found to remain almostly constant. Convection within each cell is largely controlled by the temperature field, and diffusion is dominant in the diffusive layers between the cells due to the solute field with a vertical concentration gradient. There is a clear separation of domain of dominance between the temperature and solute-induced buoyancy effects.


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