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3rd Thermal and Fluids Engineering Conference (TFEC)

ISSN: 2379-1748

MAGNETIC FIELD AND HEAT TRANSFER ANALYSIS OF HALBACH MAGNET ARRAYS FOR USE IN MAGNETIC REFRIGERATION SYSTEMS

Erim Yanik
Southern Illinois University Edwardsville, Edwardsville, IL 62026, USA

Abdullatif Hamad
Southern Illinois University Edwardsville, Edwardsville, IL 62026, USA

Serdar Celik
Department of Mechanical Engineering Southern Illinois University Edwardsville Edwardsville, Illinois, 62026, USA

DOI: 10.1615/TFEC2018.hte.021626
pages 1383-1396


KEY WORDS: Magnetic refrigeration, magnetic field, entropy, heat transfer, cooling capacity

Abstract

Due to the entropy change and space limitations in magnetic refrigeration systems, heat transfer enhancement is crucial. Cooling capacity of these systems can be increased by improving magnetic field applied on the magnetocaloric material (MCM) which results in higher entropy change and augmented heat transfer rates. In this study, radial and axial magnetic field variations within the aperture of the magnet array were determined by using the magnetic scalar potential and magnetic field relations through which analytical calculations were performed based on the expansion of the power series and the results were compared to those from the numerical analysis. In both the analytical and numerical analyses, the magnet array was assigned to have same type of permanent magnet. MCM was positioned concentrically inside the bore of the permanent magnet array. Heat transfer fluid flows through the clearance between the magnet array and the MCM. Magnetocaloric effect and corresponding entropy change and behavior of heat transfer rate around the MCM was observed. Results showed that with the cylinder long enough the magnetic field remains constant along the direction of the centerline of the magnet-MCM assembly. Analytical and numerical results were observed to be in close agreement which ensures complex analyses within more elaborate array geometries can be conducted in the future by using this mathematical method developed for domestic magnetic refrigeration systems.

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