Dufour-Soret Effects on Buoyant Convection Through a Nanofluid Layer with different Nanoparticles

Page:

31-39

DOI:

https://doi.org/10.18280/ijht.310105

OPEN ACCESS

Abstract:

The problem of steady, laminar and incompressible double diffusive natural convection flow in a wavy thin layer is studied. The thin layer is assumed to be filled with water based nanofluid having different nanoparticles namely Ag and CuO. The study includes computations for different Dufour coefficient (Df = 0, 0.3, 0.6 and 1) and Soret coefficient (Sr = 0, 0.3, 0.6 and 1). The pressure-velocity form of Navier-Stokes equations, energy equation and concentration equation are used to represent the mass, momentum, energy and concentration conservations of the nanofluid medium in the layer. The governing equations and corresponding boundary conditions are converted to dimensionless form and solved numerically by penalty finite element method with discretization by triangular mesh elements with six nodes. Flow, heat and mass transfer characteristics are presented in terms of streamlines, isotherms and iso-concentrations. In addition, results for the average radiative, convective heat and mass transfer, mean temperature and concentration of nanofluid, mid height horizontal-vertical velocities and sub domain average velocity field are offered and discussed for the above mentioned parametric conditions. Results show that the effects of Df and Sr on the convective-radiative heat and mass transfer phenomenon inside the domain are significant for all values of Df and Sr studied. The code validation shows excellent concurrence with the hypothetical outcome obtainable in the literature.

Keywords:

*buoyant convection, dufour-soret coefficients, finite element method, nanofluid having different nanoparticles, thin layer*

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