Insights into Nonlinear Stability of Dusty Viscoelastic Overlaid Magnetic Fluids: Impact of a Periodic Magnetic Field

Document Type : Research Paper

Authors
Department of Mathematics, Faculty of Education, Ain Shams University, El Makrizy St., Roxy, Heliopolis, Cairo, P.O. Box 11341, Egypt
Abstract
This study examines the nonlinear instability of two superposed Rivlin-Ericksen viscoelastic fluids at a planar interface within a permeable medium, under the combined influence of a vertical periodic magnetic field and surface tension. Viscous potential theory is employed to simplify mathematical formulation, while the Harmonic Equivalent Linearization Algorithm (HELA) is utilized to treat the nonlinear terms arising from the linearized equations of motion with appropriate boundary conditions. The analysis reveals that increasing the mean velocity, medium porosity, and magnetic-field parameter broadens the instability region and promotes destabilization of the interface. Conversely, the amplitude of periodic excitation, the density ratio, and the kinematic viscoelasticity are found to suppress perturbation growth and enhance system stability. The interfacial dynamics exhibit rich nonlinear phenomena, including resonance-driven oscillations, which are of direct relevance to applications in magnetorheological dampers, biomedical suspensions, polymer processing, and smart fluid-based engineering systems. These findings provide a coherent mathematical framework and valuable physical insights for the design and optimization of processes involving viscoelastic magnetic fluid interfaces in advanced industrial applications.
Keywords
Subjects

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