THERMAL NON-EQUILIBRIUM EFFECTS ON THE INSTABILITY MECHANISM IN A NON-NEWTONIAN JEFFREY FLUID SATURATED POROUS LAYER
Dhananjay Yadav
Abstract
In this work, the impact of local thermal nonequilibrium (LTNE) state on the convective instability of non-Newtonian Jeffrey fluid in a porous matrix is analyzed using a two-field temperature model. In view of the linear stability concept, the onset conditions for the convective instability are obtained analytically in terms of critical Rayleigh-Darcy number RD,c. The results demonstrate that the stability of the system improves with interphase heat-transmit parameter NHT , while it decreases with the Jeffrey parameter λ and altered thermal conductivities ratio γ. Some existing outcomes in the literature are also recuperated as specific states from this examination.
Topics & Concepts
InstabilityRayleigh numberMechanicsThermodynamicsPorous mediumWork (physics)Convective instabilityConvectionConvective heat transferMaterials scienceNewtonian fluidThermal instabilityThermalHeat transferPhysicsNatural convectionPorosityComposite materialNanofluid Flow and Heat TransferFluid Dynamics and Thin FilmsRheology and Fluid Dynamics Studies