Evolution of convection pattern during the solidification process of a binary mixture: effect of initial solutal concentration

Skudarnov, P. V.; Lin, Cheng-Xian; Wang, M.H; Pradeep, N.; Ebadian, M. A.

doi:10.1016/s0017-9310(02)00224-7

Cited by 16 publications

(11 citation statements)

References 14 publications

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“…In the past, similar layering phenomena of doublediffusive convection were reported for Hele-Shaw cells (Nishimura et al 1998). For various configurations with cooled sidewalls, layering was reported in the form of a stratified quiescent layer above a strongly convecting layer , layered convection cells (Skudarnov et al 2002) or as a so-called meandering flow regime (Kharicha et al 2013).…”

Section: Evolution Of the Flow Structure During Solidificationsupporting

confidence: 66%

“…This transparent model system allows for a rather easy implementation of optical measurement techniques such as schlieren imaging (Szekely and Jassal 1978), shadowgraphy and interferometry ). More recently, these studies have been extended to measure the velocity field of the melt via particle image velocimetry (PIV) (Wang et al 1999;Skudarnov et al 2002;Ghenai et al 2003). Moreover, PIV has been employed for the simultaneous analysis of clusters of equiaxed crystals by Kharicha et al (2013).…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous optical measurement of temperature and velocity fields in solidifying liquids

et al. 2020

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Section: Evolution Of the Flow Structure During Solidificationsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Simultaneous optical measurement of temperature and velocity fields in solidifying liquids

et al. 2020

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“…They showed that vortex flow appeared at the corner of the chamber when cooled from bottom. Skudarnov et al 19 carried out experiments to assess the effect of initial solute concentration on convection during solidification using the same solution as Ref. 18.…”

Section: Introductionmentioning

confidence: 99%

Convection and Solidification in Constant and Oscillating Thermal Gradients: Measurements and Simulations

Shu

Groh

2005

Journal of Thermophysics and Heat Transfer

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An experimental and numerical study of natural convection and solidification in a two-dimensional cavity driven by constant and oscillating temperature gradients is presented. Finite element models are developed to predict the flowfield, the temperature distribution, and the solid-liquid interphase shapes during solidification. Both the fixedgrid and moving-grid methods are applied in the numerical simulations, using the former to illustrate the oscillating thermal gradient conditions and using the latter to illustrate the constant temperature gradient conditions. An experimental system is set up where succinonitrile is used as a working fluid. The flow pattern, the velocity field, and the solidification interface shape are measured using the laser-based particle-image-velocimetry system. Numerical simulations and experiments are conducted for various configurations and different thermal gradients. In most cases, convection is dominated by one recirculating loop. With an inverted temperature gradient, however, multiple convection loops are observed. Both the convective flow pattern and the velocity strongly affect the solid-liquid interface shapes during solidification. In a majority of the cases studied, the model predictions are in good agreement with the experimental measurements. NomenclatureC p = specific heat f = frequency of temperature modulation g 0 = terrestrial gravity H = height of the cavitŷ i,ĵ = unit vectors in the x and y directions, respectively k = thermal conductivity L = length of the cavity Pr = Prandtl number p = pressure q T = boundary heat flux Ra = Rayleigh number S = interface St e = Stefan number T = temperature T m = melting point t = time U max = absolute value of maximum velocity u = velocity α = thermal diffusivity β = thermal expansion coefficient H = latent heat T = temperature difference between two sidewalls ε p = penalty parameter for pressure θ = shape function for temperature µ = dynamic viscosity ν = kinematic viscosity ρ = density τ = stress tensor φ = shape function for velocity ψ = shape function for pressure , ∂ = computational domain and boundary of the domain Subscripts B, T, L , R = bottom, top, left, and right sidewalls l = liquid n = normal direction s = solid t = tangential direction

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“…To investigate the transport phenomena of liquid binary alloys during solidification, many researchers have used the NH 4 Cl-H 2 O solution as the test sample [2,3,[8][9][10][11][12][13][14][15][16][17][18][19] for two reasons. First, similar to most binary alloys, the liquid, mushy, and solid zones develop sequentially during the solidification of NH 4 Cl-H 2 O solutions.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers [14][15][16][17] adopted PIV to measure the velocity field of a binary solution, such as NH 4 Cl-H 2 O, during solidification. However, these studies focused on measuring the flow field of hypo-eutectic binary solutions or super-eutectic binary solutions with concentrations only slightly different from that corresponding to the eutectic point.…”

Section: Introductionmentioning

confidence: 99%

Solidification of a Liquid Super-Eutectic Binary Alloy in an Enclosure with a Slanted Side Cooling Wall

Shun

Chiu

2011

Experimental Heat Transfer

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This study considers the effect of a slanted side cooling wall that has varying inclination angles on the development of thermosolutal convection during the solidification of a supereutectic aqueous ammonium chloride (NH 4 Cl-H 2 O) solution. The shadowgraph and particle image velocimetry techniques were employed to observe the flow development and measure the flow velocity during solidification. The transient temperature distribution within the test cell was also measured by type-T thermocouples. Experimental results reveal that a more slanted side cooling wall accelerated the "filling-box" process, thus it could cause more serious A-segregates and material defects in the solidified ingot.

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Evolution of convection pattern during the solidification process of a binary mixture: effect of initial solutal concentration

Cited by 16 publications

References 14 publications

Simultaneous optical measurement of temperature and velocity fields in solidifying liquids

Simultaneous optical measurement of temperature and velocity fields in solidifying liquids

Convection and Solidification in Constant and Oscillating Thermal Gradients: Measurements and Simulations

Solidification of a Liquid Super-Eutectic Binary Alloy in an Enclosure with a Slanted Side Cooling Wall

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