Entropy generation for an axisymmetric MHD flow under thermal non-equilibrium in porous micro duct using a modified lattice Boltzmann method

Rabhi, Raja; Amami, Bayssain; Dhahri, Hacen; Mhimid, Abdallah

doi:10.1016/j.jmmm.2016.06.068

Cited by 19 publications

(7 citation statements)

References 37 publications

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“…It is worth pointing out that that it is the numerical simulation of unsteady forced convection flow in an open channel filled with porous medium/PCM (see Sections 2 and 3) via a thermal SRT-LBM which was targeted. In this study, it was the effect of pore density ω ( PPI 10,30 =…”

Section: Results and Commentsmentioning

confidence: 99%

“…The last term of Equation 3points out the PCM viscous dissipation, which can be determined as follows [30]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The same trend can be seen in Figure 8d-f at ε = 0.8. Simply put, the melting rate sped up for fairly low PPI values (30), while a larger PPI (60) mitigated and slowed the heat transfer rate and, therefore, the melting front evolution. However, the melting evolution increased with PPI and became stronger for higher porosity (0.9) as presented in Figure 8g-i owing to the increase in metal foam heat transfer.…”

Section: Ppi Effect On Melting Front and Pcm Temperature Fieldmentioning

confidence: 99%

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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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Section: Results and Commentsmentioning

confidence: 99%

“…The last term of Equation 3points out the PCM viscous dissipation, which can be determined as follows [30]:…”

Section: Mathematical Modelmentioning

confidence: 99%

Section: Ppi Effect On Melting Front and Pcm Temperature Fieldmentioning

confidence: 99%

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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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“…The average rate of entropy generation within the porous channel can be assessed numerically as [34]:…”

Section: Entropy Generationmentioning

confidence: 99%

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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“…In Eq. ( 3), the last term is associated to the viscous heat dissipation within the PCM which can be calculated as follows [27]…”

Section: Note Thatmentioning

confidence: 99%

Numerical investigation of porosity effect on a PCM's thermal performance in a porous rectangular channel via thermal lattice Boltzmann method

Mabrouk

Naji

Dhahri

et al. 2020

International Communications in Heat and Mass Transfer

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Entropy generation for an axisymmetric MHD flow under thermal non-equilibrium in porous micro duct using a modified lattice Boltzmann method

Cited by 19 publications

References 37 publications

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

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 porosity effect on a PCM's thermal performance in a porous rectangular channel via thermal lattice Boltzmann method

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