Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
MAGNETIZATION DYNAMICS IN FERROFLUIDS: A DYNAMICAL SYSTEM APPROACH
Submission Author:
Guilherme Hasse Urel , SP
Co-Authors:
Guilherme Hasse Urel, Rafael Gontijo, Francisco Ricardo Cunha
Presenter: Guilherme Hasse Urel
doi://10.26678/ABCM.ENCIT2018.CIT18-0202
Abstract
This work presents a numerical study of the magnetization dynamics of magnetic fluids. The problem is governed by a nonlinear ordinary differential phenomenological equation that considers three mechanisms: the influence of vorticity, a relaxation magnetic process and a restorative magnetic mechanism associated with an external field. The problem is explored in terms of a dynamical system using time and frequency signatures and phase-space diagrams. Each mechanism is isolated, investigated and physically discussed. We identify a demagnetization mechanism associated with the flow vorticity and a restorative effect of external magnetic torques. The influence of dipolar long range particle interactions is also modeled by a third order asymptotic theory.
Keywords
Ferrofluids, Magnetization, Dynamical Systems, Phenomenological model, Magnetic fluids
