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http://dx.doi.org/10.9713/kcer.2014.52.2.199

Characteristics and Stability of Compositional Convection in Binary Solidification with a Constant Solidification Velocity  

Hwang, In Gook (Department of Chemical Engineering, The University of Suwon)
Publication Information
Korean Chemical Engineering Research / v.52, no.2, 2014 , pp. 199-204 More about this Journal
Abstract
In binary solidification compositional convection in a porous mushy layer influences the quality of the final products. We consider the mushy layer solidifying from below with a constant solidification velocity. The disturbance equations for the mushy layer are derived using linear stability theory. The basic-state temperature fields and the distribution of the porosity in the mushy layer are investigated numerically. When the superheat is large, the thickness of the mushy layer is relatively small compared to the thickness of the thermal boundary layer. With decreasing the superheat the critical Rayleigh number based on the thickness of the mushy layer increases and the mushy layer becomes stable to the compositional convection. The critical Rayleigh number obtained from the continuity conditions of temperature and heat flux at the mush-liquid interface is smaller than that from the isothermal condition at the upper boundary of the mushy layer.
Keywords
Binary Solidification; Compositional Convection; Mushy Layer; Rayleigh Number; Linear Stability;
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Times Cited By KSCI : 1  (Citation Analysis)
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