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Linear and nonlinear double diffusive convection in a rotating sparsely packed porous layer using a thermal non-equilibrium model

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Abstract

Double diffusive convection in a fluid-saturated rotating porous layer is studied when the fluid and solid phases are not in local thermal equilibrium, using both linear and nonlinear stability analyses. The Brinkman model that includes the Coriolis term is employed as the momentum equation. A two-field model that represents the fluid and solid phase temperature fields separately is used for the energy equation. The onset criterion for stationary, oscillatory, and finite amplitude convection is derived analytically. It is found that small inter-phase heat transfer coefficient has significant effect on the stability of the system. There is a competition between the processes of thermal diffusion, solute diffusion, and rotation that causes the convection to set in through either oscillatory or finite amplitude mode rather than stationary. The effect of solute Rayleigh number, porosity modified conductivity ratio, Lewis number, diffusivity ratio, Vadasz number, and Taylor number on the stability of the system is investigated. The nonlinear theory based on the truncated representation of Fourier series method predicts the occurrence of subcritical instability in the form of finite amplitude motions. The effect of thermal non-equilibrium on heat and mass transfer is also brought out. Some of the convection systems previously reported in the literature is shown to be special cases of the system presented in this study.

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Authors and Affiliations

  1. Department of Mathematics, Gulbarga University, Jnana Ganga Campus, Gulbarga, 585106, India

    M. S. Malashetty & Rajashekhar Heera

  2. Department of Mathematics, University of Cluj, CP253, 3400, Cluj, Romania

    Ioan Pop

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  1. M. S. Malashetty
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Correspondence to M. S. Malashetty.

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Malashetty, M.S., Pop, I. & Heera, R. Linear and nonlinear double diffusive convection in a rotating sparsely packed porous layer using a thermal non-equilibrium model. Continuum Mech. Thermodyn. 21, 317–339 (2009). https://doi.org/10.1007/s00161-009-0117-1

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  • DOI: https://doi.org/10.1007/s00161-009-0117-1

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