Enthalpy porosity model for melting and solidification of pure-substances with large difference in phase specific heats

Chakraborty, Prodyut R.

doi:10.1016/j.icheatmasstransfer.2016.12.023

Cited by 47 publications

(9 citation statements)

References 17 publications

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“…The governing equations are discretised to obtain system of linear algebraic equations and are solved iteratively for each time step using finite volume method [14]. To track the solid-liquid interface, a volume fraction updating scheme was implied as proposed in [3,6].…”

Section: Analysis and Modellingmentioning

confidence: 99%

“…Phase change process is extensively confronted in many practical applications such as manufacturing processes involving metal casting and welding, latent heat thermal storage, thermal sprays, etc. Appreciable contribution towards developing numerical and analytical models to investigate the convection and heat transfer during the solidification by several research groups can be identified in the existing literature [1][2][3][4][5][6]. Incremental efforts are made to study the effects of shrinkage because of complications involving multiphase pressurevelocity coupling and the free surface evolution during solidification process [7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…None of these existing predictions involve enthalpy updating scheme to evaluate solid and liquid volume fractions [3,6]. The present study focuses on finding the validity of enthalpy updating scheme in the existing framework, where shrinkage induced convection and free surface evolution can be captured by the model without applying any superficial numerical treatment.…”

Section: Introductionmentioning

confidence: 99%

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Shrinkage induced flow and Free surface evolution during solidification of pure metal

2019

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A numerical model is developed to study Shrinkage induced convection and free surface evolution caused by the density difference between the solid and liquid phases during the solidification of pure aluminium. For the analysis, a 2–D rectangular cavity field with aluminium melt undergoing solidification process is considered. Conservation of mass, momentum, and energy are formulated based on volume averaging technique and are solved using the SIMPLER algorithm. The free surface evolution is captured using the Volume of fluid (VOF) method. The proposed model focuses on predicting macro–scale shrinkage induced surface defects during the solidification process.

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Section: Analysis and Modellingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shrinkage induced flow and Free surface evolution during solidification of pure metal

2019

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“…It is typically considered that the material in the mushy zone is solid, partly porous and transforming as the melted material increases. One method of simulation for PCM behavior utilized by several researchers [2][3][4][5] is the enthalpy-porosity method, according to which the enthalpy of the PCM also depends on the ratio of the melted PCM. Another methodology used to solve the heat flow through PCMs by means of finite elements is the lattice Boltzmann method.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Pure and Nanoparticle-Enhanced PCM—Application in Concentric Tube Heat Exchanger

Koronaki

2020

Energies

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In this paper, organic phase change materials are modeled and studied both numerically and computationally. The results are compared with those of other research available in the international literature. Regardless of their heat storing capacity, the low heat conductivity of PCMs constitutes a significant obstacle to the further advancement of technologies pertaining to latent heat energy storage, as it hampers the immediate response of systems both at heat storage and at heat recovery. In this work, two types of nanoparticles are used as enhancing media, and the calculations are repeated in terms of melting front and stored energy enhancement. The results show that a 6.5% value for the melt percentage enhancement and a 5.5% value for the heat stored enhancement are exhibited when copper nanoparticles are utilized.

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“…Bechiri et al investigated the volumetric heat generation effects of a nano‐enhanced PCM inside a horizontal, cylindrical enclosure using an analytical solution. Based on published experimental data, Chakraborty proposed a modified enthalpy porosity formulation to calculate the phase change time of PCMs that have large differences between their liquid and solid specific heats.…”

Section: Introductionmentioning

confidence: 99%

A new model of phase change process for thermal energy storage

et al. 2018

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Summary Thermal energy can be converted into mechanical energy through the melting process of a phase change material (PCM). A PCM mixed with an insoluble liquid has higher energy converting efficiency during the whole melting process, where the massive microvacuum formed during the freezing process is filled by the insoluble liquid, which increases utilization of the volume change. The traditional theoretical model of the phase change process is unable to sufficiently describe the mixed PCM; therefore, a new model aimed at analyzing the characteristics of the volumetric change rate, as well as the freezing and melting times of the mixed PCM, is theoretically constructed. In this paper, the effective heat capacity method is used, and the effects of porosity are considered when the PCM is in the solid state. Comparisons of this model with the traditional model are carried out using both simulations and experiments for different pressures and geometric structures. Our results indicate that the introduced model has better accuracy when describing the phase change process of the pure PCM mixed with an insoluble liquid.

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Enthalpy porosity model for melting and solidification of pure-substances with large difference in phase specific heats

Cited by 47 publications

References 17 publications

Shrinkage induced flow and Free surface evolution during solidification of pure metal

Shrinkage induced flow and Free surface evolution during solidification of pure metal

Thermal Analysis of Pure and Nanoparticle-Enhanced PCM—Application in Concentric Tube Heat Exchanger

A new model of phase change process for thermal energy storage

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