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Korean Journal of Chemical Engineering, Vol.35, No.6, 1247-1256, 2018
Effect of vertically varying permeability on the onset of convection in a porous medium
Considering the vertically varying permeability of a porous medium, we conducted theoretical and numerical analyses on the onset of buoyancy-driven instability in an initially quiescent, fluid-saturated, horizontal porous layer. Darcy’s law was employed to explain the fluid flow through a porous medium and linear and nonlinear analyses are conducted. In the semi-infinite domain, the growth of disturbance and the onset of convection were analyzed with and without the quasi-steady state approximation. The present analysis of initial growth rate shows that the system is initially unconditionally stable regardless of a vertical heterogeneity parameter. The onset conditions of buoyancydriven instabilities were investigated as a function of the Darcy-Rayleigh number and the heterogeneity parameter. To find the effect of a vertical heterogeneity on the flow after the onset of convection, nonlinear numerical simulations also were conducted using the result of the linear analysis as a starting point. Nonlinear numerical simulations show that the finger-like instability motion is not readily observable at a critical time and it becomes visible approximately when a mass transfer rate substantially increases.
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[Cited By]
- Kim MC, Korean Chemical Engineering Research, 57(1), 142, 2019
- Kim MC, Korean Chemical Engineering Research, 57(5), 723, 2019
- Kim MC, Korean Journal of Chemical Engineering, 38(1), 144, 2021
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