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Natural convection in a sinusoidally heated cavity filled with ferrofluid in the presence of partial variable magnetic field

Pekmen Geridonmez (Department of Mathematics, TED University, Ankara, Turkey)
Hakan Oztop (Department of Mechanical Engineering, Technology Faculty, Firat University, Elazig, Turkey and Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 15 July 2022

Issue publication date: 3 January 2023

88

Abstract

Purpose

The purpose of this study is to investigate partial magnetic source (MS) effect on natural convection (NC) flow of a ferrofluid flow in a cavity with sinusoidally heated vertical walls. The combination of ferrohydrodynamics and magnetohydrodynamics due to the variable magnetic field (MF) and magnetite nanoparticles in one part of the cavity, and the classical NC in the other part of the cavity are concerned.

Design/methodology/approach

The dimensionless equations in stream function-vorticity form are numerically solved by radial basis functions (RBF) based collocation method.

Findings

A remarkable change in fluid flow and heat transfer is noted if the MS location is close to the left sinusoidally heated wall. In particular, the average Nusselt number is the smallest for the middle centered partial MF through the left wall at a large Hartmann number.

Research limitations/implications

RBF collocation approach is limited to small geometries due to the obtained solution globally in the entire domain of the problem.

Practical implications

If the partial restriction of the effect of MF is done in real life, it would be a control parameter at some required/requested areas of the concerned problem.

Social implications

This is a physical problem.

Originality/value

If the proposed idea of partial variable MF is able to be applied to a system in real life, it would be a good controller on fluid flow and heat transfer. RBF-based methods are also alternative numerical procedures to solve heat transfer and fluid flow problems.

Keywords

Citation

Geridonmez, P. and Oztop, H. (2023), "Natural convection in a sinusoidally heated cavity filled with ferrofluid in the presence of partial variable magnetic field", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 33 No. 1, pp. 411-435. https://doi.org/10.1108/HFF-01-2022-0053

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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