Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

Duan, Juan; Xiong, Yongliang; Yang, Dan

doi:10.3390/en12152920

Cited by 27 publications

(10 citation statements)

References 40 publications

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“…Most researchers focus on improving the low thermal conductivity of PCM to enhance melting rates. On the other hand, the geometrical characteristic of containers also influences the melting rate of pure PCM [19]. In Kamkari et al [20] and Zhao et al [21], a series of experiments and simulations were performed to study the influence of tilt angle of PCM enclosures on melting by heating different sides.…”

Section: Introductionmentioning

confidence: 99%

On the Melting Process of the Phase Change Material in Horizontal Rectangular Enclosures

2019

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Phase change material (PCM) is one of the most important ways to store and manage energy. The melting process of PCM in a rectangular enclosure with the different aspect ratio is frequently related to some thermal energy storage devices. In this work, the melting of PCM in the horizontal rectangular enclosures heated from the different sides and the influence of aspect ratio of the rectangle are carefully studied. The enthalpy porosity technique and the finite volume method (FVM) are used to simulate the melting process numerically. The results show that the melting process of PCM can be dominated by conduction or natural convection due to the different heated sides. The melting of PCM in the enclosure heated from the bottom side is firstly affected by conduction and then mostly influenced by convection. In addition, the aspect ratio of the rectangular enclosure is found to play an important role in the melting process. Finally, a series of fitting correlations of the liquid fraction, Nusselt number and the energy storage are presented with the influence of aspect ratios in order to provide the reference for designing the rectangular container of PCM. This study is helpful for the selection of an appropriate aspect ratio and heating method to achieve the desired energy storage performance of encapsulated PCM.

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Section: Introductionmentioning

confidence: 99%

On the Melting Process of the Phase Change Material in Horizontal Rectangular Enclosures

2019

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“…The total internal angle was increased from 180 up to 720 degrees, respectively, for the investigated shapes [4]. A smaller internal angle causes a higher pulling force on the wall.…”

Section: Discussionmentioning

confidence: 94%

“…Our nature is built out with many shapes, patterns, and geometry designs, either human-made or natural. The geometries can be identified as circles, squares, stars, diamonds, and many others [1][2][3][4]. Among the shapes, hexagon abounds in nature as one of the unique shapes that packed many advantages in the design [1,2].…”

Section: Introductionmentioning

confidence: 99%

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The Tendency of Nature towards Hexagon Shape Formation due to Minimizing Surface Energy

Mohd Yusof,

Mohd Szali Januddi,

Md Isa

et al. 2022

IJIE

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Nature, for instance, bubble and honeycomb, tend to form a hexagon shape naturally. The array of bubbles and honeycomb is formed by merging and sharing the common wall with the adjacent unit. Even though each of the unit shapes size may vary, the noticeable elements that built up the array are hexagons. There are many regular and irregular shapes available in nature, but the shape formation still leads to hexagon at the end of the shape evolving due to surface tension. Based on the phenomenon, this study was carried out to investigate the effect of surface tension, energy, and geometry features, which affect the tendency of hexagon formation. The study was carried out by comparing hexagon with triangle, trapezium, and square. From the result, it is found that the reduction of surface energy ranged from 10-23 percent from the initial shape. As expected, the hexagon shape is packed with the lowest surface parameter and very stable in single unit or array form by showing the lowest energy reduction. The energy content is a reflection to structure equilibrium and its stability for nature tendency.

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“…The thermal-flow behaviour in the PCM and flowing air can be described by a standard set of equations [42,43] and for the three-dimensional case, comes down to solutions of Partial Differential Equations, (PDEs), which include a mass, a momentum, and an energy equation [44]. In this context, for solving the set of equations, one of the most frequently used numerical methods, called the Finite Volume Method (FVM), [45,46] was applied.…”

Section: Numerical Modeling Of the Analyzed System With Pcm 41 Process Governing Equationsmentioning

confidence: 99%

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

et al. 2021

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The article deals with the experimental and numerical thermal-flow behaviours of a low-temperature Phase Change Material (PCM) used in Thermal Energy Storage (TES) industrial applications. The investigated PCM is a composition that consists of a mixture of paraffin wax capsuled in a melamine-formaldehyde membrane and water, for which a phase change process occurs within the temperature range of 4 °C to 6 °C and the maximum heat storage capacity is equal to 72 kJ/kg. To test the TES capabilities of the PCM for operating conditions close to real ones, a series of experimental tests were performed on cylindrical modules with fixed heights of 250 mm and different outer diameters of 15, 22, and 28 mm, respectively. The module was tested in a specially designed wind tunnel where the Reynolds numbers of between 15,250 to 52,750 were achieved. In addition, a mathematical model of the analysed processes, based on the enthalpy porosity method, was proposed and validated. The temperature changes during the phase transitions that were obtained from the numerical analyses in comparison with the experimental results have not exceeded 20% of the relative error for the phase change region and no more than 10% for the rest. Additionally, the PCM was examined while using a Scanning Electron Microscope (SEM), which indicated no changes in the internal structure during phase transitions and a homogeneous structure, regardless of the tested temperature ranges.

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Melting Behavior of Phase Change Material in Honeycomb Structures with Different Geometrical Cores

Cited by 27 publications

References 40 publications

On the Melting Process of the Phase Change Material in Horizontal Rectangular Enclosures

On the Melting Process of the Phase Change Material in Horizontal Rectangular Enclosures

The Tendency of Nature towards Hexagon Shape Formation due to Minimizing Surface Energy

The Use of Capsuled Paraffin Wax in Low-Temperature Thermal Energy Storage Applications: An Experimental and Numerical Investigation

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