Thermosolutal discharge of double diffusion mixed convection flow with Brownian motion of nanoparticles in a wavy chamber
Journal
Journal of Thermal Analysis and Calorimetry
Date Issued
2021
Author(s)
Abstract
In this paper, we have conducted a numerical investigation to investigate thermal and solutal performances of thermosolutal mixed convection flow in a wavy chamber with the influence of Brownian motion of nanoparticles. The Cu-water nanofluid is used to fill the chamber. The bottom boundary is nonuniformly concentrated and heated while the other boundaries of the chamber are fixed at constant low concentration and cold temperature. The upper and lower walls of the chamber are in motion with constant velocity. Depending on the directions of motion of the upper and lower walls, we have considered four cases. The governing equations representing incompressible viscous flows are the Navier–Stokes (N–S) equations in the form of mass, momentum, temperature and concentration equations. A compact finite difference scheme is adopted to solve those equations. We have applied KKL model of Koo-Kleinstreuer and Li for taking into account the effects of Brownian motion of Cu-water nanofluid properties in addition to the effective thermal conductivity and the dynamic viscosity. The numerical results are explored for getting a better understanding of the effects of thermal Grashof number (Gr T= 10 4), Buoyancy ratio number (N= 1), Richardson number (0.1 ? Ri ? 10.0), Lewis number (1 ? Le ? 10), the wavy surface amplitude (0.0 ? λ? 0.06), solid volume fraction (0.0 ? ?? 0.04) and undulation number of the vertical walls (0 ? d? 2). Results reveal that nanoparticles are responsible for the enhancement of heat transfer and the decrement of mass transfer. ? 2021, Akad?miai Kiad?, Budapest, Hungary.
Subjects
Brownian motion
Double diffusion
KKL model
Mixed convection
Nanofluid
Navier–Stokes equations
Thermosolutal discharge
Wavy surface
Brownian movement
Finite difference method
Mass transfer
Nanoparticles
Navier Stokes equations
Thermal conductivity
Compact finite difference schemes
Concentration equations
Effective thermal conductivity
Enhancement of heat transfer
Incompressible viscous flows
Mixed convection flow
Numerical investigations
Solid volume fraction
Nanofluidics
Type
journal article