Natural convection suppression and crystal growth during unidirectional solidification of a binary system

Nishimura, Tatsuo; Wakamatsu, Mikio

doi:10.1002/(sici)1523-1496(200003)29:2<120::aid-htj3>3.0.co;2-2

Cited by 8 publications

(2 citation statements)

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“…Freckles have been the subject of intense research for the past three decades, because of their importance as defects in alloy casting [1] and also because of the interesting fluid mechanical phenomenon associated with their formation [2]. Many experimental studies have been made to understand the conditions for initiation of freckles and their characteristics [3][4][5][6][7][8][9][10]. The experimental work cited above mainly focused on the measurement of liquid fraction [3], temperature [4] concentration [6] and flow field [7].…”

Section: Introductionmentioning

confidence: 99%

“…Many experimental studies have been made to understand the conditions for initiation of freckles and their characteristics [3][4][5][6][7][8][9][10]. The experimental work cited above mainly focused on the measurement of liquid fraction [3], temperature [4] concentration [6] and flow field [7]. All the above investigations report observations explaining the phenomenon associated with freckles formation.…”

Section: Introductionmentioning

confidence: 99%

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Role of plume convection and remelting on the mushy layer structure during directional solidification

Jain¹,

Kumar²,

Dutta³

2007

J. Phys. D: Appl. Phys.

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In the present work, solidification of a hyper-eutectic ammonium chloride solution in a bottom-cooled rectangular cavity (i.e. with stable thermal gradient) is numerically simulated. The role of finger convection and remelting on the structure of a mushy layer containing channels is studied. The numerical simulation is performed using a fixed-grid single-domain approach in which local remelting and anisotropic variation of mush permeability are taken into account. It is observed that solute-rich liquid rising in the form of finger convection causes delayed growth and localized remelting of portions of the solid/mush interface, resulting in patches of thin structure known as channels. The present study reveals the manner in which the structure of a mushy layer evolves during channel formation. Effects of bulk liquid convection on channel formation, evolution, destruction and the resulting effect on the mush structure are found to be significant. Numerical prediction with regard to variation of the number of channels with time agrees qualitatively with published experimental results.

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