An analytical solution of the heat transfer process during contact melting of phase change material inside a horizontal elliptical tube

Chen, W. Z.; Yang, Qian; Dai, Meng-Ling; Cheng, S. M.

doi:10.1002/(sici)1099-114x(199802)22:2<131::aid-er345>3.0.co;2-3

Cited by 23 publications

(8 citation statements)

References 8 publications

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“…In the last decades, a higher number of analytical [30][31][32][33][34][35][36][37] as well as numerical methods [38][39][40][41][42][43] were developed to describe the melting and freezing process of a material under the influence of gravity. The main problem concerning the numerical simulation of the melting and/or solidification process is the change with time of the position of the phase interface.…”

mentioning

confidence: 99%

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Walter¹,

Beck²,

Hameter³

2015

JEPE

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Abstract:The melting and solidification process of sodium nitrate, which is used as energy storage material, is studied in a vertical arranged energy storage device with two different bimetal finned tube designs (with and without additional lateral fins) for enhancing the heat transfer. The finned tube design consists of a plain steel tube while the material for the longitudinal (axial) fins is aluminum. The investigation analyses the influence of the lateral fins on the charging and discharging process. Three-dimensional transient numerical simulations are performed using the ANSYS Fluent 14.5 software. The results show that, every obstruction given by lateral fins reduces the melting and solidification velocity in direction to the outer shell.

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confidence: 99%

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Walter¹,

Beck²,

Hameter³

2015

JEPE

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“…However, when the solid density is more than that of the liquid PCM, the solid core moves downward during the melting process driven by the gravity force (sink effect). This effect is investigated in previous studies [22][23][24][25][26][27]. But, when there is no significant difference in the density, as in the present case, the solid core does not sink and the liquid is constrained.…”

Section: Liquid Fraction Status and Melt Streamlinesmentioning

confidence: 45%

Numerical Study of N-Eicosane Melting Inside a Horizontal Cylinder for Different Loading Rates

Benbrika¹,

Teggar²,

Benbelhout³

et al. 2020

IJHT

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This paper investigates numerically the melting of n-eicosane inside horizontal cylinders. The cylinders are embedded in a storage tank where hot air flows parallel to the cylinders during the charging process. The 2D mathematical model is based on the enthalpy-porosity method. To solve the conservation equations (continuity, momentum and energy), a CFD commercial software is employed. Numerical predictions are validated by comparison with benchmark results available in the literature. The melting characteristics of n-eicosane in horizontal cylinders are presented. The phase change dynamics, temperature distributions and melt flow patterns are analyzed. The effect of heating rate is investigated. Results show that after certain time natural heat convective currents have not the same positive effect on the melting rate due to the continuous heating of the upper melt in the enclosure; which contributes to lower the thermal charging time. Low heating rate (h=25 W m-2 K) intensifies this negative effect.

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“…In addition, the tubes of elliptic section may be an alternative for circular tubes when there is space restriction. Chen et al [18] investigated analytically melting of n-octadecane in a horizontal elliptic cylinder. They concluded that the melting rate in the elliptic enclosure is higher than that in the circular cylinder of the same cross sectional area.…”

Section: Introductionmentioning

confidence: 99%

Effect of orientation of elliptic tube on the total melting time of latent thermal energy storage systems

Benbrika

Teggar

Benbelhout

et al. 2021

Journal of Thermal Engineering

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Encapsulation of Phase Change Materials (PCM) for energy storage, thermal comfort and many other energy applications is receiving much attention due to the fact that material, physical characteristics and geometry of the container can affect drastically the thermal performance of the PCM. Phase change materials have usually low thermal conductivity which impairs their thermal charging and discharging characteristics. Different geometries were investigated including rectangular, cylindrical and spherical with and without extended surfaces to investigate the heat charge processes. Cylindrical geometries of circular sections were intensively investigated while cylinders and tubes with elliptic and elongated cross section received less attention, although they may have better thermal performance for thermal storage. The present numerical investigation is aimed at contributing to better understand the effects of the elliptic geometry and how the different geometrical and operational parameters can affect the thermal performance of the enclosed PCM. The present investigation reports the results of a numerical study on elliptic cylinders containing PCM under melting conditions. The 2D inward melting problem is modeled by using a CFD code. The numerical model is based upon the enthalpy-porosity method along with the finite control volume techniques. The numerical predictions are validated against available experimental results. The inward melting process is analyzed for two orientations of the elliptic enclosures. Due to the flow field effect namely the Rayleigh-Bénard convection, the numerical results showed that the horizontal elliptic enclosure have higher melting rate and hence lower total melting time compared to those of the vertical elliptic enclosure.

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An analytical solution of the heat transfer process during contact melting of phase change material inside a horizontal elliptical tube

Cited by 23 publications

References 8 publications

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Influence of the Fin Design on the Melting and Solidification Process of NaNO3 in a Thermal Energy Storage System

Numerical Study of N-Eicosane Melting Inside a Horizontal Cylinder for Different Loading Rates

Effect of orientation of elliptic tube on the total melting time of latent thermal energy storage systems

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