Melting of phase change materials in a trapezoidal cavity: Orientation and nanoparticles effects

Iachachene, Farida; Haddad, Zoubida; Öztop, Hakan F.; Abu‐Nada, Eiyad

doi:10.1016/j.molliq.2019.03.051

Cited by 86 publications

(19 citation statements)

References 29 publications

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“…The governing equations for conservation of mass, flow, and energy in the heat exchenger can be written as [ 33 , 35 ]: …”

Section: Methodsmentioning

confidence: 99%

“…The nano-enhanced phase change material (NePCM) are stable PCMs containing nanoparticles with improved thermal conductivity. Lachachene et al [ 35 ] explored the influence of orientation and nanoparticles on PCM melting in a trapezoidal enclosure. The inclined vertical walls were differentially heated, while the lower and upper walls were adiabatic.…”

Section: Introductionmentioning

confidence: 99%

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Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

et al. 2021

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In the present study, the thermal energy storage of a hot petal tube inside a shell-tube type Thermal Energy Storage (TES) unit was addressed. The shell is filled with the capric acid Phase Change Material (PCM) and absorbs the heat from a hot U-tube petal. The governing equations for the natural convection flow of molten PCM and phase change heat transfer were introduced by using the enthalpy-porosity approach. An automatic adaptive mesh scheme was used to track the melting interface. The accuracy and convergence of numerical computations were also controlled by a free step Backward Differentiation Formula. The modeling results were compared with previous experimental data. It was found that the present adaptive mesh approach can adequately the melting heat transfer, and an excellent agreement was found with available literature. The effect of geometrical designs of the petal tube was investigated on the melting response of the thermal energy storage unit. The phase change behavior was analyzed by using temperature distribution contours. The results showed that petal tubes could notably increase the melting rate in the TES unit compared to a typical circular tube. Besides, the more the petal numbers, the better the heat transfer. Using a petal tube could increase the charging power by 44% compared to a circular tube. The placement angle of the tubes is another important design factor which should be selected carefully. For instance, vertical placement of tubes could improve the charging power by 300% compared to a case with the tubes’ horizontal placement.

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“…The governing equations for conservation of mass, flow, and energy in the heat exchenger can be written as [ 33 , 35 ]: …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

et al. 2021

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“…There is evidence that the nanoparticles insertion intensifies the heat source cooling, especially in case the heat source is located close to the vertical cold wall. Iachachene et al 42 numerically studied the transient melting process of a PCM (paraffin wax) filled in a trapezoidal enclosure, see Figure 17. The effect of the orientation of the enclosure was investigated when it was filled with paraffin wax only.…”

Section: Application Of Pcm In the Thermal Management Of Electronic Cmentioning

confidence: 99%

Emerging applications of phase change materials: A concise review of recent advances

et al. 2020

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Phase change materials (PCMs) are used as latent heat thermal energy storage materials. The fields of application for PCMs are broad and diverse. Among these areas are thermal control of electronic components and thermal building regulations. These areas are used as heat and cold storage materials. The low thermal conductivity of PCMs is one of the significant and severe technological problems of PCMs. This paper presents a review of the latest works using PCMs in the thermal management of electronic components, buildings, and heat exchangers. Besides, it provides concise pieces of information on the classification of PCMs, their advantages, disadvantages, and thermal storage systems.

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“…In recent years, the dispersion of highly conductive nanoparticles into the PCM has been utilized to improve the unit performance during the charging and discharging processes [4]. Various nanoparticles such as pure metals [5,6], metal oxides [7,8], and carbon-based nanoparticles [9] have been considered. The results of these studies have denoted that the volume fraction of nanoparticles plays an important role in controlling the melting and solidification processes.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Melting Performance in a Conical Latent Heat Thermal Unit Having Variable Length Fins

et al. 2021

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A conical shell-tube design with non-uniform fins was addressed for phase change latent heat thermal energy storage (LHTES). The shell was filled with nano-enhanced phase change material (NePCM). The cone aspect ratio of the shell and the fins aspect ratio were adopted as the geometrical design parameters. The type and volume fraction of the nanoparticles were other design parameters. The investigated nanoparticles were alumina, graphite oxide, silver, and copper. The finite element method was employed to solve the natural convection flow and phase change thermal energy equations in the LHTES unit. The Taguchi optimization method was utilized to maximize the melting rate in the unit. Two cases of ascending and descending conical shells were investigated. The outcomes showed that the shell-aspect ratio and fin aspect ratio were the most important design parameters, followed by the type and concentration of nanoparticles. Both ascending and descending designs could lead to the same melting rate at their optimum design. The optimum design of LHTES could improve the melting rate by up to 18.5%. The optimum design for ascending (descending) design was a plain tube (a cone aspect ratio of 1.17) filled by 4.5% alumina-Bio-PCM (1.5% copper-Bio-PCM).

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Melting of phase change materials in a trapezoidal cavity: Orientation and nanoparticles effects

Cited by 86 publications

References 29 publications

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

Melting phase change heat transfer in a quasi-petal tube thermal energy storage unit

Emerging applications of phase change materials: A concise review of recent advances

Evaluation of the Melting Performance in a Conical Latent Heat Thermal Unit Having Variable Length Fins

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