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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Elsevier
2025-09-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379725002918 |
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| author | Aissa Abderrahmane Houssem Laidoudi Abdeldjalil Belazreg Obai Younis Hamoud A. Al-Nehari Riadh Marzouki |
| author_facet | Aissa Abderrahmane Houssem Laidoudi Abdeldjalil Belazreg Obai Younis Hamoud A. Al-Nehari Riadh Marzouki |
| author_sort | Aissa Abderrahmane |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-c28bd6c8ff314ee89cc90c9b0899b3e2 |
| institution | Kabale University |
| issn | 2211-3797 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj-art-c28bd6c8ff314ee89cc90c9b0899b3e22025-08-20T05:06:26ZengElsevierResults in Physics2211-37972025-09-017610839710.1016/j.rinp.2025.108397Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat sourceAissa Abderrahmane0Houssem Laidoudi1Abdeldjalil Belazreg2Obai Younis3Hamoud A. Al-Nehari4Riadh Marzouki5Laboratoire de Physique Quantique de la Matière et Modélisation Mathématique (LPQ3M), University of Mascara, AlgeriaFaculty of Mechanical Engineering, University of Oran, Oran 31000, AlgeriaLaboratoire de Physique Quantique de la Matière et Modélisation Mathématique (LPQ3M), University of Mascara, AlgeriaDepartment of Mechanical Engineering, College of Engineering in Wadi Alddawasir, Prince Sattam Bin Abdulaziz University, Saudi ArabiaDepartment of Mechanical Engineering, Faculty of Engineering, Sana’a University, P.O. Box 12544, Sana’a, Yemen; Corresponding author.Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, 61413 Abha, Saudi ArabiaA 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.http://www.sciencedirect.com/science/article/pii/S2211379725002918Mixed convectionMagneto‑hydrodynamicsNEPCM suspensionRotating heat sourceFinite‑element methodTrapezoidal cavity |
| spellingShingle | Aissa Abderrahmane Houssem Laidoudi Abdeldjalil Belazreg Obai Younis Hamoud A. Al-Nehari Riadh Marzouki Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source Results in Physics Mixed convection Magneto‑hydrodynamics NEPCM suspension Rotating heat source Finite‑element method Trapezoidal cavity |
| title | Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source |
| title_full | Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source |
| title_fullStr | Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source |
| title_full_unstemmed | Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source |
| title_short | Parametric study of MHD mixed convection heat transfer in a trapezoidal cavity with NEPCM suspension and rotating star-shaped heat source |
| title_sort | parametric study of mhd mixed convection heat transfer in a trapezoidal cavity with nepcm suspension and rotating star shaped heat source |
| topic | Mixed convection Magneto‑hydrodynamics NEPCM suspension Rotating heat source Finite‑element method Trapezoidal cavity |
| url | http://www.sciencedirect.com/science/article/pii/S2211379725002918 |
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