Title: Oscillatory convection in viscoelastic ferrofluid layer: Linear and non-linear stability analyses
Authors: Dhiman, Joginder Singh
Sood, Sumixal
Citation: Applied and Computational Mechanics. 2023, vol. 17, no. 2, p. 121-140.
Issue Date: 2023
Publisher: University of West Bohemia
Document type: článek
URI: http://hdl.handle.net/11025/55268
ISSN: 1802-680X (Print)
2336-1182 (Online)
Keywords: nelineární stabilita;oscilační konvekce;ferrofluidy;viskoelastické;rozdvojení
Keywords in different language: non-linear stability;oscillatory convection;ferrofluids;viscoelastic;pitchfork bifurcation
Abstract in different language: The problem of ferroconvection in a viscoelastic fluid layer is studied with the aim to investigate oscillatory mo tions. In this article, a stability analysis for both linear and nonlinear systems is carried out. In the linear stability analysis, the expressions for steady and oscillatory Rayleigh numbers are obtained and the effects of magnetic as well as viscoelastic parameters on the onset of viscoelastic ferromagnetic convection are investigated numerically. From the analysis, we found that the magnetic number (M1), the stress relaxation time (λ1) and the nonlinearity of magnetization (M3) have destabilizing influences on the onset of ferroconvection, whereas the strain retardation time (λ2 ) has stabilizing influence. In the weakly nonlinear stability analysis, the formula for heat transfer rate in terms of the Nusselt number is derived for oscillatory convection. From the analyses, we found that for increasing values of the magnetic number, stress relaxation time and nonlinearity of magnetization, the heat transfer rate rises, whereas it decreases for larger values of the strain retardation time. Moreover, the pitchfork bifurcation analysis yields that in order to reach the stable positions, the value of amplitude increases as the stress relaxation time increases, whereas a reverse trend is observed for the strain retardation time.
Rights: © 2017 University of West Bohemia. All rights reserved.
Appears in Collections:Volume 17, number 2 (2023)
Volume 17, number 2 (2023)

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