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On the Dynamics of Two‐Component Convective Dissolution in Porous Media
Author(s) -
Jafari Raad Seyed Mostafa,
Hassanzadeh Hassan,
EnnisKing Jonathan
Publication year - 2019
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2018wr024572
Subject(s) - buoyancy , convection , diffusion , instability , thermal diffusivity , double diffusive convection , convective instability , porous medium , mechanics , dissolution , thermodynamics , materials science , rayleigh number , physics , chemistry , natural convection , porosity , composite material
We studied the influence of the diffusion contrast between species on the dynamics of Rayleigh‐Bénard (RB) convection in porous media. The onset time of buoyancy‐driven instabilities and convective dissolution flux was quantified using linear stability analysis and direct numerical simulations. The parametric analysis indicates eight distinct instability regions. Different stability mechanisms were characterized over the given range of diffusivity and relative buoyancy ratios. In particular, transition from instabilities solely by double diffusion to RB convection was identified using linear stability analysis and confirmed using nonlinear simulations. The parametric analysis on the onset also indicates that double diffusion has a potential to accelerate or slow down the RB convection depending on the solutes diffusion contrast. This study provides new insight into the effect of diffusion contrast and can be used to develop strategies for acceleration and deceleration of buoyancy‐driven instabilities.