Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source

Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source

A comprehensive numerical investigation of two-dimensional, steady, laminar magneto–hydrodynamic (MHD) mixed convection in a trapezoidal cavity filled with a nano-encapsulated phase–change material (NEPCM) suspension is presented. A star‑shaped heat source located at the cavity centre rotates with a...

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Bibliographic Details
Main Authors: Aissa Abderrahmane, Houssem Laidoudi, Abdeldjalil Belazreg, Obai Younis, Hamoud A. Al-Nehari, Riadh Marzouki
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Results in Physics
Subjects:
Mixed convection
Magneto‑hydrodynamics
NEPCM suspension
Rotating heat source
Finite‑element method
Trapezoidal cavity
Online Access:http://www.sciencedirect.com/science/article/pii/S2211379725002918
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Summary:A comprehensive numerical investigation of two-dimensional, steady, laminar magneto–hydrodynamic (MHD) mixed convection in a trapezoidal cavity filled with a nano-encapsulated phase–change material (NEPCM) suspension is presented. A star‑shaped heat source located at the cavity centre rotates with a constant angular velocity, while a uniform transverse magnetic field acts on the flow. The physical model couples the energy equation with a temperature–dependent effective specific heat formulation to represent the phase transition of NEPCM particles. The dimensionless governing equations are solved using a Galerkin weighted residual finite‑element method. Detailed parametric studies are carried out for Reynolds number Re = 10–1000, Darcy number Da = 10−6–10−2, Hartmann number Ha = 0–100 and NEPCM volume fraction φ = 0–0.08. Grid independence and code verification against benchmark solutions are demonstrated. Results reveal that increasing Re and Da enhances the average Nusselt number by up to 47 % and 23 %, respectively, whereas an 8 % NEPCM loading yields a modest ≈2 % enhancement due to increased slurry viscosity. Lorentz forces progressively damp convective rolls, reducing heat transfer at Ha > 40. The unique combination of a rotating internal heater, complex cavity geometry, and phase‑change suspension provides new insights for the design of compact thermal energy‑storage and electronics‑cooling devices.
ISSN:2211-3797

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