Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
NUMERICAL SIMULATIONS OF THERMOMAGNETIC CONVECTION INSIDE A THIN CAVITY
Submission Author:
Ciro Alegretti , SP
Co-Authors:
Ciro Alegretti, Arthur Alves Rios Campos, Francisco Ricardo Cunha, Rafael Gontijo
Presenter: Ciro Alegretti
doi://10.26678/ABCM.ENCIT2018.CIT18-0189
Abstract
This paper is focused on the theoretical and numerical investigation of the natural convection of a ferrofluid in a two dimensional cavity. This study consists in a coupling between hydrodynamic, magnetic and thermal phenomena. The latest formulation for the Maxwell stress tensor and the superparamagnetic regime are considered. A scaling analysis is presented, which determinates the ideal aspect ratio for the rectangular cavity. Constant temperature condition is considered for the side walls, whereas adiabatic for the bottom and top walls. The Finite Differences Method is applied to the partial differential equations discretization. The semi-implicit fractional-step scheme is implemented to a staggered grid in order to solve the coupled equation system. Code validation is conduced in respect to previous studies of natural convection in the absence of magnetic effects. A non-uniform magnetic field is applied to the cavity. The enhancement of heat transfer properties are presented both qualitatively and quantitatively. Flow pattern and temperature fields illustrate the attenuation of temperature gradients under magnetic field application.
Keywords
ferrofluid, thermomagnetic convection, superparamagnetism
