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Onset of convection in a porous mush during binary solidification

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Abstract

The onset of convection in a mushy layer during solidification of a binary melt is investigated by using the propagation theory we have developed. The critical conditions for the mushy-layer-mode of instability are obtained numerically for aqueous ammonium chloride solution. The mush thickness at the onset of convection is predicted as a function of the solution viscosity and compared with the experimental data. The onset time of the mushy-layer-mode convection has a minimum point with varying the superheat. When the superheat is large, the mushy layer grows slowly and a long time is required for the onset of convection.

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Authors and Affiliations

  1. Department of Chemical and Biochemical Engineering, The University of Suwon, Gyeonggi-do, 445-743, Korea

    In Gook Hwang

  2. School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-742, Korea

    Chang Kyun Choi

Authors
  1. In Gook Hwang
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  2. Chang Kyun Choi
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Correspondence to In Gook Hwang.

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Hwang, I.G., Choi, C.K. Onset of convection in a porous mush during binary solidification. Korean J. Chem. Eng. 25, 199–202 (2008). https://doi.org/10.1007/s11814-008-0036-z

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  • DOI: https://doi.org/10.1007/s11814-008-0036-z

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