The effects of double-diffusion and viscous dissipation on the oscillatory convection in a viscoelastic fluid saturated porous layer

2020 ◽  
Vol 32 (9) ◽  
pp. 094108
Author(s):  
Kamalika Roy ◽  
R. Ponalagusamy ◽  
P. V. S. N. Murthy
Keyword(s):  
Viscous Dissipation ◽  
Porous Layer ◽  
Viscoelastic Fluid ◽  
Double Diffusion ◽  
Oscillatory Convection ◽  
Saturated Porous Layer

Convection in a viscoelastic fluid-saturated sparsely packed porous layer

1990 ◽  
Vol 68 (12) ◽  
pp. 1446-1453 ◽  
Author(s):  
N. Rudraiah ◽  
P. V. Radhadevi ◽  
P. N. Kaloni
Keyword(s):  
Rayleigh Number ◽  
Porous Layer ◽  
Viscoelastic Fluid ◽  
Critical Rayleigh Number ◽  
Maxwell Fluid ◽  
Wave Number ◽  
Jeffrey Fluid ◽  
Oscillatory Convection ◽  
Viscoelastic Parameters ◽  
Jeffreys Model

The linear stability of a viscoelastic fluid-saturated sparsely packed porous layer heated from below is studied analytically using the Darcy–Brinkman–Jeffreys model with different boundary combinations. The Galerkin technique is employed to determine the criterion for the onset of oscillatory convection. The effects of the viscoelastic parameters, the Prandtl number, and the porous parameter on the critical Rayleigh number, the wave number, and the frequency are analyzed. The results are compared with those obtained for both a Darcy–Jeffrey fluid and a Maxwell fluid. It is shown that under certain conditions for the viscoelastic parameters, the flow is overstable. The possibility of the occurrence of bifurcation is also discussed.

Oscillatory convection in a viscoelastic fluid through a porous layer heated from below

1989 ◽  
Vol 28 (1) ◽  
pp. 48-53 ◽  
Author(s):  
N. Rudraiah ◽  
P. N. Kaloni ◽  
P. V. Radhadevi
Keyword(s):  
Porous Layer ◽  
Viscoelastic Fluid ◽  
Oscillatory Convection
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