Behavior of Fine Bubbles in Front of the Solidifying Interface.

Wang, Zhe; Mukai, Kusuhiro; Lee, In Jae

doi:10.2355/isijinternational.39.553

Cited by 47 publications

(39 citation statements)

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“…When the solute-build-up at the gap be- tween the advancing front and the particle causes the interfacial energy gradient around the particle, the attractive or the repulsive force operates the particle. 21) The concentration range where the interfacial energy remarkably decreases generally locates in the dilute concentration region (i.e. 0-0.2 at% for O and S in molten steel 31,32) ).…”

Section: Effect Of the Solutal Conditionmentioning

confidence: 99%

“…In addition to the two different forces, it was also reported that the concentration gradient ahead of the solidifying interface could promote movement of the inclusions in accordance with the solute concentration dependence of the interfacial energy. 21) Especially, the force due to the interfacial energy gradient may significantly affect the particle engulfment when a small amount of the solutes that are surface active is added. The proposed models of the particle pushing/engulfment [9][10][11][12][13][14][15][16][17][18][19][20] essentially consider the thermal and the solutal effects on the particle pushing/engulfment, but do not explicitly include the melt flow.…”

Section: Introductionmentioning

confidence: 99%

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Model Experiment of Particle Engulfment into the Solidifying Shell under Fluid Flow

2004

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A model experiment was performed to investigate movement of inclusions near the solid wall and engulfment into the solidifying front. Polystyrene particles (100 mm in diameter) were suspended in flowing melts (water, 20 mass% NaCl aqueous solution and succinonitrile). As the average flow velocity increased, number of the particles reaching the vicinity of the solid wall increased whereas the average stationary time of the particles near the wall decreased. Number of the particles engulfed into the solidifying shell deceased with increasing the flow velocity. Moreover, addition of 3 mass% acetone clearly reduced number of the engulfed particles. In this study, the stationary time and the capture time were introduced to consider the engulfment. The particle engulfment was qualitatively explained by considering changes of the stationary time and the capture time. According to the observation, probability of the engulfment for the particles reaching the solidifying front was 0.01 at most. Only the particles of which the stationary time was much longer than the average value were engulfed. The present study indicated that the particle engulfment under the melt flow should be considered as a probabilistic process.KEY WORDS: inclusion; engulfment; melt flow; solidifying front.ing. 23,24) A model experiment using water was also performed to analyze behavior of non-metallic inclusions near the solidified shell under the fluid flow. 25) According to the water model experiment, 25) the main factor avoiding the nonmetallic inclusion entrapment is the force given by the horizontal flow. The Saffman force was recognized when the particles removed from the solidifying shell. Moreover, effects of the surface roughness and the flow direction with respect to the rising/sedimentation velocity on the inclusion entrapment were also reported. [26][27][28] The immiscible particles that are denser than the liquid phase tended to concentrate near the wall, whereas the immiscible particles that were less dense than the liquid tended to migrate away from the wall. 28) However, it is not still understood how the immiscible particles reach the solidifying front under the turbulent flow and are engulfed into the solidifying front. Furthermore, it is of interest to consider a phenomenological model which systematically links the controllable parameters such as flow velocity and alloy concentration with the engulfment of the particles into the solidifying front.In this study, movement of the polystyrene particles near the solid wall under melt flow is observed in water, 20 mass% NaCl aqueous solution and succinonitrile (an organic material). Simple parameters related to the particle movement near the solidifying front are introduced to explain effect of the melt flow and the solute addition on the particle engulfment. Based on the experimental results, the particle engulfment into the solidifying front is discussed by using the parameters. Figure 1 shows an experimental cell in which the particle movement near the solid wall is observed under ...

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Section: Effect Of the Solutal Conditionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model Experiment of Particle Engulfment into the Solidifying Shell under Fluid Flow

2004

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“…(7) and the velocity calculated from Eq. (5) of our paper 1) by taking into account possible experimental errors, respectively. According to Fig.…”

Section: Comparison Of Theoretical and Experimentalmentioning

confidence: 99%

“…Our paper named "Behavior of fine bubbles in front of the solidifying interface" 1) was published in ISIJ International (Vol. 39, 1999, p. 553).…”

Section: Introductionmentioning

confidence: 99%

Reply to the Paper Named "The Force Acting on a Sphere Moving towards a Solidification Front due to an Interfacial Energy Gradient at the Sphere/Liquid Interface".

2001

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“…The purpose of this paper is to attempt to give a better theoretical interpretation to the new and very precise experimental data obtained by Wang et al 1) The key equation in our new model is an improved equation on the force acting on a spherical particle or bubble moving towards a solidification front due to the existence of an interfacial energy gradient at the particle/liquid or bubble/liquid interface.…”

Section: Introductionmentioning

confidence: 99%

The Force Acting on a Sphere Moving towards a Solidification Front due to an Interfacial Energy Gradient at the Sphere/Liquid Interface.

Kaptay

Kelemen

2001

ISIJ International

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Behavior of Fine Bubbles in Front of the Solidifying Interface.

Abstract: Experimental results were found to be well in accord with theoretical analysis.

Cited by 47 publications

References 2 publications

Model Experiment of Particle Engulfment into the Solidifying Shell under Fluid Flow

Model Experiment of Particle Engulfment into the Solidifying Shell under Fluid Flow

Reply to the Paper Named "The Force Acting on a Sphere Moving towards a Solidification Front due to an Interfacial Energy Gradient at the Sphere/Liquid Interface".

The Force Acting on a Sphere Moving towards a Solidification Front due to an Interfacial Energy Gradient at the Sphere/Liquid Interface.

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