Abstract
The triple diffusive convection in an Oldroyd-B fluid-saturated porous layer is investigated by performing linear and weakly nonlinear stability analyses. The condition for the onset of stationary and oscillatory is derived analytically. Contrary to the observed phenomenon in Newtonian fluids, the presence of viscoelasticity of the fluid is to degenerate the quasiperiodic bifurcation from the steady quiescent state. Under certain conditions, it is found that disconnected closed convex oscillatory neutral curves occur, indicating the requirement of three critical values of the thermal Darcy-Rayleigh number to identify the linear instability criteria instead of the usual single value, which is a novel result enunciated from the present study for an Oldroyd-B fluid saturating a porous medium. The similarities and differences of linear instability characteristics of Oldroyd-B, Maxwell, and Newtonian fluids are also highlighted. The stability of oscillatory finite amplitude convection is discussed by deriving a cubic Landau equation, and the convective heat and mass transfer are analyzed for different values of physical parameters.
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Abbreviations
- d :
-
depth of the porous layer
- g :
-
gravitational acceleration
- K :
-
permeability of the porous medium
- k :
-
unit vector in the vertical direction
- M :
-
ratio of heat capacities
- p :
-
pressure
- Pr D :
-
Darcy-Prandtl number
- q :
-
velocity vector
- R S i :
-
solute Darcy-Rayleigh number of the ith-component
- R T :
-
thermal Darcy-Rayleigh number
- t :
-
time
- x, y, z :
-
space coordinates
- α :
-
horizontal wave number
- α T :
-
thermal expansion coefficient
- α S i :
-
solute analogue of αT, i = 1, 2
- ε :
-
porosity
- κ T :
-
thermal diffusivity
- κ S i :
-
solute diffusivity, i = 1, 2
- λ1 :
-
stress relaxation time
- λ2 :
-
strain retardation time
- Λ1 :
-
stress relaxation parameter
- Λ2 :
-
strain retardation parameter
- μ :
-
dynamic viscosity
- ν :
-
kinematic viscosity
- ρ :
-
fluid density
- σ :
-
growth term
- τ i :
-
ratio of diffusivities, i = 1, 2
- ψ :
-
stream function
- b:
-
basic state
- L:
-
lower boundary
- U:
-
upper boundary
- *:
-
dimensionless variable
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The authors thank reviewers for their constructive remarks and useful suggestions, which improve the work significantly.
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Citation: RAGHUNATHA, K. R. and SHIVAKUMARA, I. S. Stability of triple diffusive convection in a viscoelastic fluid-saturated porous layer. Applied Mathematics and Mechanics (English Edition), 39(10), 1385–1410 (2018) https://doi.org/10.1007/s10483-018-2376-8
Project supported by the Innovation in Science Pursuit for the Inspired Research (INSPIRE) Program (No. DST/INSPIRE Fellowship/[IF 150253])
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Raghunatha, K.R., Shivakumara, I.S. Stability of triple diffusive convection in a viscoelastic fluid-saturated porous layer. Appl. Math. Mech.-Engl. Ed. 39, 1385–1410 (2018). https://doi.org/10.1007/s10483-018-2376-8
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DOI: https://doi.org/10.1007/s10483-018-2376-8