THE EFFECT OF COUPLE STRESSES ON STABILITY ANALYSIS OF MAGNETIZED FERROFLUID SATURATING A POROUS MEDIUM HEATED FROM BELOW
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Published:2024
Issue:5
Volume:27
Page:85-106
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ISSN:1091-028X
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Container-title:Journal of Porous Media
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language:en
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Short-container-title:J Por Media
Author:
Thakur Akanksha,Sunil ,Devi Reeta
Abstract
This work aims to inspect the impact of couple stress forces on the convective stability of magnetized ferrofluid
saturating a porous medium for different combinations of bounding surfaces. Both linear and nonlinear analyses are
conducted to obtain eigenvalue problems. Normal mode analysis is used for linear analysis, while the energy method is used for nonlinear analysis, and a generalized energy functional is introduced. For solving eigenvalue problems, the Galerkin method is employed. It is found that the Rayleigh numbers for the two analyses did not match, suggesting the existence of a subcritical region. Furthermore, it is observed that the subcritical region decreased as the magnetic parameter increased, whereas an increase in the couple stress parameter increased the subcritical region. The effect of medium permeability has been found to be destabilizing. For this analysis, three combinations of bounding surfaces are considered. It is also observed that fluid confined in the rigid-rigid bounding surface is more thermally stable, which is suitable for convection in ferrofluid.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science,Biomedical Engineering,Modeling and Simulation
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