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

Duan, Juan; Xiong, Yongliang; Yang, Dan

doi:10.3390/en12163100

Cited by 21 publications

(20 citation statements)

References 38 publications

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“…2015; Duan et al. 2019). In this case, the equations governing the velocity field and the pressure inside the melted liquid can be written respectively as where the term is the buoyancy estimated under the Boussinesq approximation, implying that the effect of temperature variations is considered only on liquid density .…”

Section: Thermal Flowsmentioning

confidence: 99%

“…2013; Duan et al. 2019), and is denoted as the ratio of the total heat transfer rate per unit length to the conductive heat transfer rate per unit length, as the corresponding dimensions of both numerator and denominator are W m. Dividing both the numerator and the denominator by , the present definition can be converted to the standard definition as in Shishkina (2016), where is the ratio between the average horizontal heat flux and the conductive heat flux.…”

Section: Thermal Flowsmentioning

confidence: 99%

“…However, the reported correlation leads to a substantial overestimation (Duan et al. 2019). More than 10 years later, Wang et al.…”

Section: Introductionmentioning

confidence: 98%

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Melting processes of phase change materials in a horizontally placed rectangular cavity

Jiao²,

Jia³

2022

J. Fluid Mech.

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This paper revisits the melting process of phase change materials (PCMs) enclosed in a horizontally placed rectangular cavity, with isothermal and adiabatic conditions subjected to the vertical and horizontal walls, respectively. First, numerical simulations based on an improved lattice Boltzmann method are conducted to illustrate and to inform the theoretical modelling. It is shown that, compared with the traditional two-stage conduction–convection melting description, it is more reasonable to include a third stage in terms of the heat transfer behaviour. During the third stage, the remnant solid PCM is located in the corner formed by the cold and bottom walls of the cavity, and an increasing part of the input energy will be transferred directly out of the cavity without compensating for the melting latent heat, thus inducing a continuously decreasing melting rate until the end of the melting process. Then theoretical predictions are derived piecewise for the melted liquid fraction during the entire melting process, and the corresponding transitions between two successive stages are also discussed. The results are validated successfully via the available experimental and numerical data in the literature, and could guide the design and operation of latent heat storage systems.

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Section: Thermal Flowsmentioning

confidence: 99%

Section: Thermal Flowsmentioning

confidence: 99%

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Melting processes of phase change materials in a horizontally placed rectangular cavity

Jiao²,

Jia³

2022

J. Fluid Mech.

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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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“…Their conclusions evidenced that the heat source location can significantly affect the heat transfer process of PCM. Duan et al [15] appraised the heat transfer process of PCM in rectangular containers with three aspect ratios under constant temperature boundary conditions, which provided a theoretical basis for the container designs. Kamkari [16][17][18] investigated the heat transfer process of PCM under constant temperature boundary conditions by numerical calculation and experiment verification.…”

Section: Introductionmentioning

confidence: 99%

Comparative investigation of phase change material on heat transfer characteristics under theoretical and practical periodic temperature boundary

et al. 2022

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In this paper, heat transfer characteristics of phase change material in rectangular containers are numerically analyzed. The inclination angles of the container refer to 0?, 90?, and 180?. Both theoretical and practical periodic temperature boundary conditions are taken into consideration, in which the periodic temperature boundary conditions include 50-80?C and 65-80?C. The comparison study is carried out through the liquid fraction and temperature histories during the heat transfer process under these different boundary conditions. It is indicated that there are large differences between the calculated results under the theoretical and the practical periodic temperature boundary conditions when the temperature boundary is 50-80?C, while the theoretical and the practical periodic temperature boundary conditions of 65-80?C have relatively little effect on the numerical results of the heat transfer process of the phase change material. Furthermore, compared with the temperature increasing stage, the numerical results calculated under the theoretical and the practical boundary conditions have more significant differences in the temperature decreasing stage. The research conclusion of this paper can provide a theoretical basis for the application of PCM under periodic temperature boundary conditions.

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

Cited by 21 publications

References 38 publications

Melting processes of phase change materials in a horizontally placed rectangular cavity

Melting processes of phase change materials in a horizontally placed rectangular cavity

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

Comparative investigation of phase change material on heat transfer characteristics under theoretical and practical periodic temperature boundary

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