Numerical study of melting inside concentric and eccentric horizontal annulus

Darzi, A. Ali Rabienataj; Farhadi, Mousa; Sedighi, Kurosh

doi:10.1016/j.apm.2011.11.033

Cited by 235 publications

(65 citation statements)

References 25 publications

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“…Darzi et al [18] carried out a 2D numerical study for symmetric melting of N-eicosane between two horizontal cylinders in concentric and eccentric arrays. The predicted results show that when the inner cylindrical tube moves downwards, the melting rate increases sharply due to the larger zone of dominant natural convection heat transfer in the PCM.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…A 2D vertical slice of the cylinder is modeled to reduce computational time. Following previous numerical studies using Fluent [9,18,25], the transient simulation with the pressure staggering option (PRESTO) scheme is used for the pressure correction equation, and a Coupled algorithm was used for pressurevelocity coupling. A second order upwind scheme was used to solve the momentum and energy equations.…”

Section: Numerical Modelmentioning

confidence: 99%

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Numerical investigation of heat transfer mechanism in a vertical shell and tube latent heat energy storage system

Seddegh

Wang

Henderson

2015

Applied Thermal Engineering

133

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Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

Section: Numerical Modelmentioning

confidence: 99%

Numerical investigation of heat transfer mechanism in a vertical shell and tube latent heat energy storage system

Seddegh

Wang

Henderson

2015

Applied Thermal Engineering

133

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“…However, this model captures the main characteristics of melting heat transfer and shape of the solid-liquid interface. It has also been employed by the other researcher for melting heat transfer and suggests promising results [13].…”

Section: Numerical Validationmentioning

confidence: 99%

“…Results showed that employing the rounded corner or placing some solid above the heat source contributes to efficiency of the thermal storage unit. Darzi et al [13] made a comparison study on melting of the n-eicosane between two cylinders in concentric and eccentric arrays, where the inner cylindrical tube is hot wall while the outer is insulated. They found melting in the eccentric annulus can be significantly accelerated except for the initial 15 min.…”

Section: Introductionmentioning

confidence: 99%

A comparison study on melting inside the rectangular and curved unit with a vertical heating wall

Gao

et al. 2015

J Therm Anal Calorim

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Efficient and rational use of thermal energy requires the design and development of suitable and costeffective latent heat storage systems. In this study, a novel curved thermal storage unit is put forward and its thermal behavior has been numerically compared with the traditional rectangular PCM-based thermal storage unit. The solid-liquid interface evolution, liquid flow pattern and temperature distribution are presented. Transient Nu at the heating wall and full melting time are also calculated. The numerical results show the high impact of the enclosure geometry on melting and nature convection. A reduction of 30.6 % in thermal storage time has been achieved by changing the unit from rectangular to curve. Moreover, parametric studies are conducted to assess how thermal performance of the units is affected by the heating wall temperature and PCM thermal conductivity. Correlations encompassing a wide range of parameters are developed in terms of full melting time. Results indicate that proportion of full melting time reduced for the curved unit is almost a constant value and does not vary significantly with these factors. All these may be very helpful for the design of more efficient thermal storage units.

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“…They showed the rate of melting at the top region of sphere is faster than at the bottom region. Darzi et al [22] studied numerically the melting of PCM between two cylinders in concentric and eccentric array. They found that natural convection plays important roles in melting.…”

mentioning

confidence: 99%

Unconstrained melting and solidification inside rectangular enclosure

Darzi¹,

Afrouzi²,

Khaki³

et al. 2015

J. Fundam and Appl Sci.

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The present study concerns with the numerical study of unconstrained solidification and melting of phase change material (PCM) inside a two dimensional open rectangular cavity.The Cavity is filled by RT-27 as phase change material and air. Numerical study is carried out for different cavity aspect ratios. Result indicates that the conduction heat transfer is dominant at initial time of melting process where the layer of liquid PCM near hot surface is so thin.Solid PCM sinks to bottom of cavity due to higher density in respect to liquid PCM. Melting rate does not experience significant change by increasing cavity aspect ratio. The time of full solidification is much more than melting. It is due to the absence of natural convection with respect to melting process. By increasing the cavity aspect ratio, the solidification rates enhances significantly and its total time therefore reduces.

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Numerical study of melting inside concentric and eccentric horizontal annulus

Cited by 235 publications

References 25 publications

Numerical investigation of heat transfer mechanism in a vertical shell and tube latent heat energy storage system

Numerical investigation of heat transfer mechanism in a vertical shell and tube latent heat energy storage system

A comparison study on melting inside the rectangular and curved unit with a vertical heating wall

Unconstrained melting and solidification inside rectangular enclosure

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