Transient buoyancy-opposed double diffusive convection of micropolar fluids in a square enclosure

The present study considers transient buoyancy-opposed double diffusive free convection of a micropolar fluid consisting of rigid and non-deformable particles suspension with its own rotation in a square enclosure. The governing equations are written in terms of the primitive variables and a numeric...

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Vydáno v:International journal of heat and mass transfer Ročník 81; s. 681 - 694
Hlavní autoři: Jena, Sofen K., Malla, Laxman K., Mahapatra, Swarup K., Chamkha, Ali J.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Elsevier Ltd 01.02.2015
Témata:
Buoyancy
Critical buoyancy ratio
Diffusion
Double diffusion
Enclosure
Fluid flow
Mathematical analysis
Mathematical models
Micro polar fluid
Micropolar fluids
Operator splitting algorithm
Viscosity
Vortex viscosity parameters
Vortices
Vortex viscosity parameters
Critical buoyancy ratio
Micro polar fluid
Operator splitting algorithm
Double diffusion
ISSN:0017-9310, 1879-2189
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Shrnutí:The present study considers transient buoyancy-opposed double diffusive free convection of a micropolar fluid consisting of rigid and non-deformable particles suspension with its own rotation in a square enclosure. The governing equations are written in terms of the primitive variables and a numerical solution of the complete set of nonlinear equations has been done without any scaling to the flow terms. The modified Marker and Cell (MAC) method is used for the solution of the variables in the primitive form with the help of the Alternating Direction Implicit (ADI) scheme. In order to handle effectively the advection terms, the gradient dependent consistent hybrid upwind scheme of second order (GDCHUSSO) and the operator-splitting algorithm have been employed. A parametric study is conducted to illustrate the effects of the Rayleigh number, Prandtl number, buoyancy ratio and the vortex viscosity parameter. Interesting features of stability at critical buoyancy ratios with the inclusion of the vortex viscosity parameter is reported. Detailed distributions of isotherms, isoconcentrations, flow lines and microrotation lines are provided to reveal the concealed physics of the complex phenomenon. A power spectrum analysis and phase plane maps are provided to bring clarity about the instability involved in the phenomenon. Correlations have been developed for the average Nusselt and Sherwood numbers based on the computed results.
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ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2014.10.030