Abstract
The encapsulation technique of phase change materials in the nanodimension is an innovative approach to improve the heat transfer capability and solve the issues of corrosion during the melting process. This new type of nanoparticle is suspended in base fluids call NEPCMs, nanoencapsulated phase change materials. The goal of this work is to analyze the impacts of pertinent parameters on the free convection and entropy generation in an elliptical-shaped enclosure filled with NEPCMs by considering the effect of an inclined magnetic field. To reach the goal, the governing equations (energy, momentum, and mass conservation) are solved numerically by CVFEM. Currently, to overcome the low heat transfer problem of phase change material, the NEPCM suspension is used for industrial applications. Validation of results shows that they are acceptable. The results reveal that the values of N u ave descend with ascending Ha while N gen has a maximum at Ha = 16 . Also, the value of N T , MF increases with ascending Ha . The values of N u ave and N gen depend on nondimensional fusion temperature where good performance is seen in the range of 0.35 < θ f < 0.6 . Also, Nu ave increases 19.9% and ECOP increases 28.8% whereas N gen descends 6.9% when ϕ ascends from 0 to 0.06 at θ f = 0.5 . Nu ave decreases 4.95% while N gen increases by 8.65% when Ste increases from 0.2 to 0.7 at θ f = 0.35 .
Highlights
Nanofluids can be produced by adding the nanosized particles into the base fluids
phase change materials (PCMs) are used in many industrial applications, the low thermal conductivity of PCMs is a disadvantage for systems with charge and discharge cycles
The entropy generation and natural convection are scrutinized in a medium located between concentric horizontal wavy-circular wall and elliptical enclosure filled by NEPCMs suspension
Summary
Nanofluids can be produced by adding the nanosized particles (such as copper and silver) into the base fluids (i.e., oils, water, and so on). In 2018, characterizations of natural convection in vertical cylindrical shell-and-tube latent heat thermal energy storage (LHTES) systems were numerically and experimentally investigated by Seddegh et al [33]. In 2020, Hasehmi-Tilehnoee et al [37] studied natural convection and entropy generation in a complex medium filled with nanofluid and NEPCM suspension. The entropy generation and natural convection are scrutinized in a medium located between concentric horizontal wavy-circular wall and elliptical enclosure filled by NEPCMs suspension. (1) A complex porous medium enclosure filled with NEPCM suspension is considered (2) An inclined magnetic field is applied to the fluid flow (3) e effects of decision parameters such as Ra, Ha, β, Da, A, N, Ste, θf, φ, Nc, Nv, and λ (see the Nomenclature) are investigated on heat transfer and entropy generation (4) e ratio of heat transfer to entropy generation is evaluated
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