Unsteady natural convection flow of a suspension comprising Nano-Encapsulated Phase Change Materials (NEPCMs) in a porous medium

By Mohammad Ghalambaz, S. A. M. Mehryan, A. Hajjar, Ali Veismoradi. 2020

149 citations recorded by the source corpus.

Abstract The free convection phase change heat transfer of a suspension comprising Nano-Encapsulated Phase Change Materials (NEPCMs) in a porous space is theoretically addressed. The core of the nanoparticles is made of a phase change material and encapsulated in a thin shell. Hence, the core of the nanoparticles of the suspension undergoes a phase change at its fusion temperature and release/store large amounts of latent heat. The phase change of nanoparticles is modeled using a sine shape temperature-dependent heat capacity function. Darcy-Brinkman model is used to model the flow in the porous medium. The governing equations including the conservation of mass, momentum, and heat are transformed into a non-dimensional form before being solved by the finite element method in a structured non-uniform mesh. The influence of the porosity, Darcy number, Rayleigh number, fusion temperature of nanoparticles, and the unsteady time-periodic boundary conditions on the thermal behavior of the porous medium in the presence of NEPCM particles is investigated. The results show that the presence of NEPCM particles improves the heat transfer. The increase of porosity improves the heat transfer when the volumetric concentrations of NEPCM particles are higher than 3%. There exists an optimal dimensionless fusion temperature of NEPCM nanoparticles for the interval [0.25; 0.75].

Subfields: Biomedical Engineering, Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/a057db0c7c4a1c2c20282f6f53fda10d7121680c

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In Biomedical Engineering

In Computational Mechanics

In Mechanical Engineering

Citations in the corpus

Theoretical Study of Convective Heat Transfer in Ternary Nanofluid Flowing past a Stretching Sheet (2021, background): “[24] Ghalambaz, M., GroSan, T., Pop, I., Mixed convection boundary layer flow and heat transfer over a vertical plate embedded in a porous medium filled with a suspension of nano-encapsulated phase change materials, Journal of Molecular Liquids, 293, 2019, 111432.”
Local thermal nonequilibrium conjugate natural convection of nano‐encapsulated phase change particles in a partially porous enclosure (2020, unknown): “Hence, following the work of Ghalambaz et al, 42 the present study aims to address the heattransfer of the NEPCM-suspensions in a layer of the porous medium using the LTNE model for the first time.”