%0 Journal Article
%A Saritha, Natesan
%A Kumar, A. Senthil
%D 2018
%I Begell House
%K double diffusion, natural convection, buoyancy ratio, square cavity, nanofluid
%N 4
%P 307-320
%R 10.1615/ComputThermalScien.2018020672
%T DOUBLE DIFFUSIVE NATURAL CONVECTION IN A SQUARE ENCLOSURE FILLED WITH COPPER-WATER NANOFLUID INDUCED BY OPPOSITE TEMPERATURE AND CONCENTRATION GRADIENTS
%U http://dl.begellhouse.com/journals/648192910890cd0e,011ba367373c71b7,179769a14babde25.html
%V 10
%X Double-diffusive natural convection in a Cu–water nanofluid-filled square enclosure neglecting the effect of Soret and
Dufour is studied numerically. The horizontal walls are well insulated and impermeable, while the vertical walls are
imposed to opposite temperature and concentration gradients. Brinkman, Maxwell–Garnett models are used to determine
the effective dynamic viscosity and thermal conductivity of Cu–water nanofluid, respectively. A computational
code based on the SIMPLE algorithm is used to solve the system of conservation equations of mass, momentum, energy,
and species. Simulations are performed using the thermal Rayleigh number, the buoyancy ratio, and the solid
volume fraction as independent variables. The numerical results are studied in terms of velocity profiles, streamlines, isotherms, iso-concentrations, local and average Nusselt numbers, and Sherwood number for a wide range of Rayleigh number Ra = 10^{4}–10^{5}, the buoyancy ratio *N* = 0.1–10 and the solid volume fraction (0 ≤ φ ≤ 0.1) with Prandtl number Pr = 5.0 and Lewis number Le = 1. It is found that utilizing Cu–water nanofluid enhances the heat transfer
sufficiently while the enhancement is marginal for the mass transfer. It is also observed that the fluid flow behavior
increases with increasing Rayleigh number but decreases with increasing solid volume fraction.
%8 2018-06-14