Dissertation/Thesis Abstract

Magnetic Field and Heat Transfer Analysis of Magnetic Refrigeration Systems with Different Magnet Array Geometries
by Yanik, Erim, M.S., Southern Illinois University at Edwardsville, 2018, 111; 10808213
Abstract (Summary)

Magnetic refrigeration is one of the alternative cooling technologies that is environmental friendly and has high theoretical coefficient of performance values. This thesis study focuses on magnetic field and heat transfer enhancement of a reciprocating-type magnetic refrigeration system. A set of NdFeB 52 MGOe permanent magnets were employed to form a Halbach magnet array. Gadolinium (Gd) was used as the magnetocaloric material. It was placed concentrically within the Halbach array aperture with the working fluid running through the gap in between the magnet assembly and Gd yielding annular flow. Three different annular flow geometries namely; circular, octagonal and hexagonal cross-sections were studied. Magnetization process was analyzed theoretically, numerically and experimentally for k = 4 configuration. Numerical analysis was done by Finite Element Method Magnetics (FEMM), theoretical analysis was conducted by a mathematical model, and experimental analysis was performed on a Halbach magnet array. Obtained magnetic field results were used to calculate corresponding entropy changes and heat flux values. These values were compared to numerical heat transfer results from ANSYS and a close agreement between results were observed.

Indexing (document details)
Advisor: Celik, Serdar
Commitee: Hamad, Abdullatif, Lotfi, Nima, Yan, Terry
School: Southern Illinois University at Edwardsville
Department: Mechanical and Industrial Engineering
School Location: United States -- Illinois
Source: MAI 57/06M(E), Masters Abstracts International
Subjects: Thermodynamics, Mechanical engineering, Energy
Keywords: Environmentally-friendly, Halbach, Heat transfer, Magnetic field, Magnetic refrigeration
Publication Number: 10808213
ISBN: 9780355991260
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