Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analysis of the magnetic field influence on ferrofluid heat exchangers for applications in thermoacoustic engines
Submission Author:
Arthur França Martins , SP
Co-Authors:
Arthur França Martins, Flávio Bannwart
Presenter: Flávio Bannwart
doi://10.26678/ABCM.COBEM2023.COB2023-1529
Abstract
Magnetic heat exchangers differ from conventional non-magnetic ones due to their susceptibility to a magnetic field, which can lead to a relevant heat flow if it is sufficiently intense. Such relevance, on the other hand, depends on the context of heat transfer demand, which guides the design of the heat exchanger. In this work, the fluids are a ferrofluid, which is a magnetic fluid that flows inside a copper tube, and atmospheric air as the external thermoacoustic working fluid. To correctly evaluate magnetic convection, it is necessary to have knowledge of several conditions such as applied magnetic field and its geometry, magnetic susceptibility of the ferrofluid, viscosity and conduction behavior as a function of the magnetic field. In this way, the study aims to understand the influence of the applied magnetic field on magnetic convection through the variation and evaluation of the magnetic Nusselt number via CFD in the context of a standing wave thermoacoustic engine application. In fact, results show that the way the magnetic field is applied produces a different induced magnetic field, which in turn directly influences the magnetic Nusselt number.
Keywords
Heat exchanger, Ferrofluids, Magnectic Field, thermoacoustics
