Studies on turbulent momentum, heat and species transport during binary alloy solidification in a top-cooled rectangular cavity

Chakraborty, Suman; Chakraborty, Nilanjan; Kumar, P. Phani; Dutta, Pradip

doi:10.1016/s0017-9310(02)00402-7

Cited by 31 publications

(11 citation statements)

References 18 publications

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“…Chakraborty et al 44 analyzed the effects of turbulent transport during a binary alloy solidification process where turbulence effects were introduced through standard k-ε equations. The coefficients were appropriately modified to account for phase-change.…”

Section: Modeling Of the Solidification Processmentioning

confidence: 99%

Modeling of Convection and Macrosegregation through Appropriate Consideration of Multiphase/Multiscale Phenomena during Alloy Solidification

Pardeshi

Dutta

Singh

2009

Ind. Eng. Chem. Res.

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Solidification processes are complex in nature, involving multiple phases and several length scales. The properties of solidified products are dictated by the microstructure, the macrostructure, and various defects present in the casting. These, in turn, are governed by the multiphase transport phenomena occurring at different length scales. In order to control and improve the quality of cast products, it is important to have a thorough understanding of various physical and physicochemical phenomena occurring at various length scales, preferably through predictive models and controlled experiments. In this context, the modeling of transport phenomena during alloy solidification has evolved over the last few decades due to the complex multiscale nature of the problem. Despite this, a model accounting for all the important length scales directly is computationally prohibitive. Thus, in the past, single-phase continuum models have often been employed with respect to a single length scale to model solidification processing. However, continuous development in understanding the physics of solidification at various length scales on one hand and the phenomenal growth of computational power on the other have allowed researchers to use increasingly complex multiphase/multiscale models in recent times. These models have allowed greater understanding of the coupled micro/macro nature of the process and have made it possible to predict solute segregation and microstructure evolution at different length scales. In this paper, a brief overview of the current status of modeling of convection and macrosegregation in alloy solidification processing is presented.

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Section: Modeling Of the Solidification Processmentioning

confidence: 99%

Modeling of Convection and Macrosegregation through Appropriate Consideration of Multiphase/Multiscale Phenomena during Alloy Solidification

Pardeshi

Dutta

Singh

2009

Ind. Eng. Chem. Res.

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“…Therefore, turbulence effects on transport processes have to be taken into account in such systems. In the present study, a modified form of the standard k-e model of turbulence [9] is employed to account for turbulence effects in the liquid region and mushy zone. The governing conservation equations have been derived on the basis of a continuum model for binary alloys, as originally developed by Bennon and Incropera [10].…”

Section: Governing Equationsmentioning

confidence: 99%

“…However, a low-Reynoldsnumber model requires so fine a grid near the wall that it demands much computational costs, especially in complex geometry, e.g., a submerged entry nozzle. In the present work, although the standard k-e model is applied to the whole domain, particular considerations are followed for the mushy zone, following Chakraborty et al [9]. They suggested that…”

Section: Conservation Of Energymentioning

confidence: 99%

Coupled Turbulent Flow, Heat, and Solute Transport in Continuous Casting Processes with an Electromagnetic Brake

Kang

Ryou

Hur

2005

Numerical Heat Transfer, Part A: Applications

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This study describes the numerical modeling of coupled turbulent fluid flow, heat, and solute transport in a continuous slab caster with an electromagnetic brake (EMBr). Transport equations of total mass, momentum, energy, and species for a binary iron-carbon alloy system are solved using a continuum model. The turbulent effects are taken into account using the standard k-e equations, where coefficients are appropriately modified for phase change. The electromagnetic field is described by Maxwell equations. A finite-volume method is employed to solve the conservation equations associated with appropriate boundary conditions. The process variables considered are the casting speed, magnetic flux density, and carbon segregation. The effects of these process variables on the velocity, temperature, and solute distributions are reported and discussed.

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“…Cartesian grid can be used to capture the complicated etchfront in multidimensional etching problems. The proposed method is analogous to the enthalpy method used in the modeling of melting/solidification process [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

A fixed-grid approach for diffusion- and reaction-controlled wet chemical etching

Rath¹,

Chai²,

Lam³

et al. 2005

International Journal of Heat and Mass Transfer

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Studies on turbulent momentum, heat and species transport during binary alloy solidification in a top-cooled rectangular cavity

Cited by 31 publications

References 18 publications

Modeling of Convection and Macrosegregation through Appropriate Consideration of Multiphase/Multiscale Phenomena during Alloy Solidification

Modeling of Convection and Macrosegregation through Appropriate Consideration of Multiphase/Multiscale Phenomena during Alloy Solidification

Coupled Turbulent Flow, Heat, and Solute Transport in Continuous Casting Processes with an Electromagnetic Brake

A fixed-grid approach for diffusion- and reaction-controlled wet chemical etching

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