Journal ArticleDOI
A study on effective thermal conductivity of crystalline layers in layer melt crystallization
Kwang-Joo Kim,Joachim Ulrich +1 more
TLDR
In this article, an effective thermal conductivity in layer melt crystallization was explored based on a model considering inclusions inside a crystalline layer during crystal growth, molecular diffusion of inclusions migration due to temperature gradient and heat generation due to recrystallization of the inclusions.Abstract:
An effective thermal conductivity in layer melt crystallization was explored based on a model considering inclusions inside a crystalline layer during crystal growth, molecular diffusion of inclusions migration due to temperature gradient and heat generation due to recrystallization of inclusions in the crystalline layer. The effective thermal conductivity increases with time, in general, as a result of compactness of the layer. Lower cooling temperature, i.e. greater supercooling, results in a more porous layer with lower effective thermal conductivity. A similar result is seen for the parameter of melt temperature, but less pronounced. A high concentration of the melt results in a high effective thermal conductivity while low concentration yields low effective thermal conductivity. At higher impurity levels in the melt phase, constitutional supercooling becomes more pronounced and unstable growth morphologies occur more easily. Cooling rate and Reynolds number also affect the effective thermal conductivity. The predictions of an effective thermal conductivity agree with the experimental data. The model was applied to estimate the thermal conductivities of the crystalline layer during layer melt crystallization.read more
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Dissertation
Iceberg water transportation from Antarctica to Australia
TL;DR: In this paper, an iceberg water transport system from Antarctica to Western Australia is proposed, which is based on three main steps: belting and wrapping of the iceberg in-situ with a bag and a collar; transportation of this system into warmer areas and the collection of the melted water of iceberg in the collar and specific fresh water bags, and Lastly, waterbag transportation using sustainable techniques of current drifting and kite towing.
Journal ArticleDOI
Falling film melt crystallization (I): Model development, experimental validation of crystal layer growth and impurity distribution process
TL;DR: In this article, a detailed model of the crystal layer growth and multi-ion impurity distribution process in the falling film melt crystallization (FFMC) model was developed and validated.
Journal ArticleDOI
Using complex layer melt crystallization models for the optimization of hybrid distillation/melt crystallization processes
TL;DR: In this paper, a distilliation/melt crystallization hybrid process is optimized by realistically describing crystallization separation efficiency and by implementing sweating, and the required crystallization models are presented and experimentally validated.
Journal ArticleDOI
Mathematical Modeling of Layer Crystallization on a Cold Column with Recirculation
Nima Yazdanpanah,Nima Yazdanpanah,Allan S. Myerson,Allan S. Myerson,Bernhardt L. Trout,Bernhardt L. Trout +5 more
TL;DR: In this paper, a dynamic model of falling liquid film crystallization with a recirculation loop was developed in the form of coupled partial differential equations describing the effects of mass transfer, heat transfer, impurity inclusion, and crystallization kinetics.
Journal ArticleDOI
Progress in the Application of Fractal Porous Media Theory to Property Analysis and Process Simulation in Melt Crystallization
TL;DR: The application of fractal porous media (FPM) theory in melt crystallization is a novel concept to be developed extensively, which has received wide attention in recent years as discussed by the authors.
References
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Journal ArticleDOI
Neue Gleichungen für den Wärme- und den Stoffübergang in turbulent durchströmten Rohren und Kanälen
TL;DR: In this paper, a Gleichung for warme and stoffubergangskoeffizienten in durchstromten Rohren und Kanalen wurde unter Einbeziehung von Mesergebnissen fur grose Reynolds-and hohe Prandtlzahlen entwickelt, die sowohl den Ubergangsbereich als auch den Bereich der vollausgebildeten turbulenten Stromung einschliest.
Journal ArticleDOI
Migration of a Liquid Zone through a Solid: Part I
TL;DR: In this article, the migration of cylindrical and spherical zones through a block of solid under the influence of a temperature gradient has been analyzed theoretically, and the relative rates of migration are in the above order if KS>KL and the reverse order ifKS
Journal ArticleDOI
Generalized correlation of the water frost thermal conductivity
TL;DR: In this article, a more comprehensive method of calculating the frost thermal conductivity based on both theory and experimental data has been developed, which can be used for a general frost model.
Journal ArticleDOI
On the distribution and movement of impurities in crystalline layers in melt crystallization processes
TL;DR: In this article, the impurity distribution within crystal layers in laboratory equipment (tube crystallizer of 1.5 m length, with the crystalline layers on the inside or the outside).
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