Numerical analysis of magnetic field and heat transfer of a reciprocating magnetocaloric regenerator using a halbach magnet array
Küçük Resim Yok
Tarih
2020
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
American Society of Mechanical Engineers (ASME)
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this study, a numerical model of a reciprocating magnetocaloric regenerator using a Halbach magnet array is developed in ANSYS-FLUENT software. The model consists of three components, namely, (i) the Halbach magnet array, (ii) the magnetocaloric material (MCM), and (iii) the heat transfer fluid. A two-dimensional (2D) domain is studied due to the axisymmetric geometry of the physical model. A pressure difference is defined between the inlet and outlet sections of the fluid domain to maintain a reciprocating fluid flow. In the proposed computational scheme, a segregated approach is followed to consider the spatial distribution of the magnetic field in the thermal analyses. Therefore, a 2D magnetic field within the MCM is computed using an analytical approach at first, and its results are integrated into ANSYS-FLUENT with a user-defined function (UDF). Hydrodynamic and heat transfer characteristics of the proposed regenerator model are evaluated under various Reynolds numbers and cycle durations. Moreover, the temperature drop at the cold side of the regenerator is represented in terms of the pressure difference, flow duration, and the diameter of Gadolinium (Gd) as the MCM. For the current geometrical configurations, it is observed that the magnetic field varies from 0.4 T to 1 T within Gd. The highest temperature spans are measured as 8.4 K, 7.5 K, and 7.2 K numerically for the cycle durations of 1.2 s, 2.2 s, and 4.2 s, respectively. Copyright © 2020 by ASME.
Açıklama
Anahtar Kelimeler
Computational fluid dynamics, Magnetic refrigeration, Magnetic regenerator, Magnetocaloric effect, Weiss mean field theory
Kaynak
Journal of Heat Transfer
WoS Q Değeri
Scopus Q Değeri
Q2
Cilt
142
Sayı
9
