Lattice Boltzmann simulation of forced convection melting of a composite phase change material with heat dissipation through an open-ended channel

Mabrouk, Riheb; Dhahri, Hacen; Naji, Hassane; Hammouda, Seifeddine Ben; Younsi, Zohir

doi:10.1016/j.ijheatmasstransfer.2020.119606

Cited by 20 publications

(21 citation statements)

References 44 publications

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“…The source term (III) and the last term of Equation ( 5) point out, respectively, the melting term (which takes into account the rate of latent heat stored/released) and the PCM's viscous dissipation, which can be expressed as follows [15]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…For the problem deemed here, the dimensionless entropy generation rate (Ns) is reflected by the entropy generation due to heat transfer induced by local temperature gradients and the generation entropy due to fluid friction resulting from viscous effects in the fluid and at fluid-solid interfaces, which, under the LTNE conjecture, can be expressed as [15,33]:…”

Section: Entropy Generationmentioning

confidence: 99%

“…Their findings demonstrated an optimum porosity that mitigates the fusion time while improving the latent heat storage (LHS) rate performance. Mabrouk et al [15] performed a numerical analysis of unsteady forced convection heat transfer in an open-ended straight channel filled with a metal foam and PCM (paraffin) embedded in its pores. They demonstrated that the quantity and quality of stored energy is influenced by key parameters such as Reynolds (Re) and Eckert (Ec) numbers and porosity.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Metal Foam Pore Density Effect on Sensible and Latent Heats Storage through an Enthalpy-Based REV-Scale Lattice Boltzmann Method

2021

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In this work, an unsteady forced convection heat transfer in an open-ended channel incorporating a porous medium filled either with a phase change material (PCM; case 1) or with water (case 2) has been studied using a thermal lattice Boltzmann method (TLBM) at the representative elementary volume (REV) scale. The set of governing equations includes the dimensionless generalized Navier–Stokes equations and the two energy model transport equations based on local thermal non-equilibrium (LTNE). The enthalpy-based method is employed to cope with the phase change process. The pores per inch density (10≤PPI≤60) effects of the metal foam on the storage of sensible and latent heat were studied during charging/discharging processes at two Reynolds numbers (Re) of 200 and 400. The significant outcomes are discussed for the dynamic and thermal fields, the entropy generation rate (Ns), the LTNE intensity, and the energy and exergy efficiencies under the influence of Re. It can be stated that increasing the PPI improves the energy and exergy efficiencies of the latent heat model, reduces energy losses, and improves the stored energy quality. Likewise, at a moderate Re (=200), a low PPI (=10) would be suitable to reduce the system irreversibility during the charging period, while a high value (PPI = 60) might be advised for the discharging process. As becomes clear from the obtained findings, PPI and porosity are relevant factors. In conclusion, this paper further provides a first analysis of entropy generation during forced convection to improve the energy efficiency of various renewable energy systems.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Entropy Generationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation of Metal Foam Pore Density Effect on Sensible and Latent Heats Storage through an Enthalpy-Based REV-Scale Lattice Boltzmann Method

2021

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“…It should be stressed that our in-house code was already validated [23]. However, before presenting and commenting on the results in the dedicated section, we ensured to further validate it using other previously published benchmarks.…”

Section: Code Validationmentioning

confidence: 99%

“…Liu and He [22] succeeded in simulating conduction fusion in a semi-infinite space, solidification in a semi-infinite corner, and convection fusion in a square cavity filled with porous media using a double MRT-LBM. Most recently, Mabrouk et al [23] analyzed the heat transfer under forced convection through a PCM-saturated porous channel under LTNE during the melting and solidification cycles using an LBM with a single relaxation time (SRT) at the REV scale and relevant parameters such as the Reynolds number, Eckert number, and porosity. They showed that the storage energy is optimal for a critical Reynolds number in the range examined.…”

Section: Introductionmentioning

confidence: 99%

Insight into Foam Pore Effect on Phase Change Process in a Plane Channel under Forced Convection Using the Thermal Lattice Boltzmann Method

et al. 2020

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In this work, the two-dimensional laminar flow and the heat transfer in an open-ended rectangular porous channel (metal foam) including a phase change material (PCM; paraffin) under forced convection were numerically investigated. To gain further insight into the foam pore effect on charging/discharging processes, the Darcy–Brinkmann–Forchheimer (DBF) unsteady flow model and that with two temperature equations based on the local thermal non-equilibrium (LTNE) were solved at the representative elementary volume (REV) scale. The enthalpy-based thermal lattice Boltzmann method (TLBM) with triple distribution function (TDF) was employed at the REV scale to perform simulations for different porosities (0.7≤ε≤0.9) and pore per inch (PPI) density (10≤PPI≤60) at Reynolds numbers (Re) of 200 and 400. It turned out that increasing Re with high porosity and PPI (0.9 and 60) speeds up the melting process, while, at low PPI and porosity (10 and 0.7), the complete melting time increases. In addition, during the charging process, increasing the PPI with a small porosity (0.7) weakens the forced convection in the first two-thirds of the channel. However, the increase in PPI with large porosity and high Re number limits the forced convection while improving the heat transfer. To sum up, the study findings clearly evidence the foam pore effect on the phase change process under unsteady forced convection in a PCM-saturated porous channel under local thermal non-equilibrium (LTNE).

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Investigation of Pulsed Flow Effects on the Phase Change Within an Open-Cell Metal Foam Using Thermal Lattice Boltzmann Method

Mabrouk

Benim²,

Naji³

et al. 2023

Transp Porous Med

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Lattice Boltzmann simulation of forced convection melting of a composite phase change material with heat dissipation through an open-ended channel

Cited by 20 publications

References 44 publications

Numerical Investigation of Metal Foam Pore Density Effect on Sensible and Latent Heats Storage through an Enthalpy-Based REV-Scale Lattice Boltzmann Method

Numerical Investigation of Metal Foam Pore Density Effect on Sensible and Latent Heats Storage through an Enthalpy-Based REV-Scale Lattice Boltzmann Method

Insight into Foam Pore Effect on Phase Change Process in a Plane Channel under Forced Convection Using the Thermal Lattice Boltzmann Method

Investigation of Pulsed Flow Effects on the Phase Change Within an Open-Cell Metal Foam Using Thermal Lattice Boltzmann Method

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