Numerical analysis of water melting and solidification in the interior of tubes

Souza, Sandi; Vielmo, Horácio A.

doi:10.1590/s1678-58782005000200004

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The direction of original cell is still counterclockwise, because the temperature of the cell is higher than the peak-density temperature. These results are consistent with those of de Souza and Vielmo [17] who studied ice formation and melting processes in tubes for HVAC applications. Figure 4 shows the solidification time for the conduction and conduction-plusconvection modes of heat transfer with Ra = 10 6 to 10 7 .…”

Section: Resultssupporting

confidence: 92%

The role of natural convection and density variations in the solidification process of water in an annular enclosure

Alawadhi¹,

Bourisli²

2012

Advances in Fluid Mechanics IX

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Unsteady natural convection flow during the solidification process of water in the annulus is numerically modeled using the finite element method. The annulus inner surface temperature is kept at a temperature lower than the solidification temperature. Ice is formed at the inner surface while natural convection flow is induced in the liquid portion. The goal of this study is to evaluate the effect of natural convection and variations in the density of water on the solidification process. The water density peak near the solidification temperature creates a unique flow structure. High resolution capturing of the solid/liquid moving boundary and the details of the flow structure and temperature contours are presented.

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Section: Resultssupporting

confidence: 92%

The role of natural convection and density variations in the solidification process of water in an annular enclosure

Alawadhi¹,

Bourisli²

2012

Advances in Fluid Mechanics IX

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“…From the amount of heat-stored standpoint, phase-change material (PCM) can store or release a large amount of latent heat during the melting and solidification processes due to a large enthalpy amount of phase changing that is usually more than 100-200 times the sensible heat. Moreover, unlike a sensible storage device that experiences high temperature changes during the thermal absorption and release processes, a TES system integrated with a PCM, namely latent heat thermal energy storage (LHTES), operates in an almost isotherm process [4]. Table 1 shows the thermal properties of some commercial PCMs [5].…”

Section: Introductionmentioning

confidence: 99%

Successive melting and solidification of paraffin–alumina nanomaterial in a cavity as a latent heat thermal energy storage

Farsani

Raisi

Mahmoudi

2019

J Braz. Soc. Mech. Sci. Eng.

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Latent heat thermal energy storage (LHTES) plays a main role in many industrial applications, especially in high-powered electronics cooling systems and providing the thermal energy demand when the energy supply is unavailable. In this study, the LHTES cycle process, including successive melting and solidification, investigates in a two-dimensional annular space of a square cavity filled with nanomaterial of paraffin-alumina as a nanoPCM. In the melting process, all sidewalls of the cavity are insulated. Meanwhile, a constant heat rate generates homogeneously within the central heat source. At the end of melting, the heat generation gets off, while a time-reducing temperature lower than the paraffin melting point imposes on the sidewalls, and then, solidification triggers. The numerical simulation was accomplished using control volume method and the governing equations solved using the SIMPLE algorithm. The enthalpy-porosity method was employed to model the phase-change front. The value of thermal conductivity and the viscosity of the nanofluid have been experimentally measured before the numerical modeling. In this study, the effect of volume fraction of nanoparticles (0-0.03) has been investigated on the successive melting and solidification rate for a constant Rayleigh number of 5.74 × 10 5 . The results show that adding nanoparticles to the PCM equal to the volume fractions of 0.01 and 0.02 improves melting rate, but the nanofluid with the volume fraction of 0.03 represents a poor heat transfer rate during melting even weaker than those for nanofluid with the volume fraction of 0.01. It also observed that the nanomaterial with the volume fraction of φ = 0.03 represents the highest solidification rate. However, taking the overall performance of successive melting and solidification system into account, the nanofluid with the volume fraction of 0.02 remarked the most effective heat transfer rate in comparison with the other examined cases. KeywordsSuccessive melting and solidification • PCM • LHTES • Nanomaterial • Paraffin • Alumina List of symbols b Enthalpy-porosity coefficient (kg m −3 s −1 ) B Dimensionless enthalpy-porosity coefficient B z Boltzmann constant c Specific heat (J kg −1 K −1 ) f Liquid fraction g Gravity (m s −2 )

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Numerical Modeling and Simulation of Thermal Energy Storage Systems

Dinçer

Rosen

2010

Thermal Energy Storage

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Numerical analysis of water melting and solidification in the interior of tubes

Cited by 5 publications

References 11 publications

The role of natural convection and density variations in the solidification process of water in an annular enclosure

The role of natural convection and density variations in the solidification process of water in an annular enclosure

Successive melting and solidification of paraffin–alumina nanomaterial in a cavity as a latent heat thermal energy storage

Numerical Modeling and Simulation of Thermal Energy Storage Systems

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