HYBRID NANOFLUID FLOW ON MHD NATURAL CONVECTION WITH THE ASPECT RATIONS OF SINUSOIDAL TEMPERATURE DISTRIBUTED POROUS CAVITY

In this study, a new cavity form filled under a constant magnetic field by Ag/MgO/H2O nanofluids and porous media consistent with natural convection and total entropy is examined. The nanofluid flow is considered to be laminar and incompressible, while the advection inertia effect in the porous layer is taken into account by adopting the Darcy–Forchheimer model. The problem is explained in the dimensionless form of the governing equations and solved by the finite element method. The results of the values of Darcy (Da), Hartmann (Ha) and Rayleigh (Ra) numbers, porosity (εp), and the properties of solid volume fraction (ϕ) and flow fields were studied. The findings show that with each improvement in the Ha number, the heat transfer rate becomes more limited, and thus the magnetic field can be used as an outstanding heat transfer controller.

Download Full-text

NUMERICAL STUDY ON NATURAL CONVECTION IN A POROUS CAVITY THAT IS PARTIALLY HEATED AND COOLED BY SINUSOIDAL TEMPERATURE AT VERTICAL WALLS

Journal of Porous Media ◽

10.1615/jpormedia.2019018275 ◽

2019 ◽

Vol 22 (1) ◽

pp. 73-85

Author(s):

Liamena Hassinet ◽

Mohamed Si-Ameur

Keyword(s):

Natural Convection ◽

Numerical Study ◽

Porous Cavity ◽

Vertical Walls ◽

Sinusoidal Temperature

Download Full-text

Natural Convection in a Wavy Porous Cavity With Sinusoidal Temperature Distributions on Both Side Walls Filled With a Nanofluid: Buongiorno's Mathematical Model

Journal of Heat Transfer ◽

10.1115/1.4029816 ◽

2015 ◽

Vol 137 (7) ◽

Cited By ~ 54

Author(s):

M. A. Sheremet ◽

I. Pop

Keyword(s):

Mathematical Model ◽

Brownian Motion ◽

Natural Convection ◽

Numerical Study ◽

Motion Parameter ◽

Porous Cavity ◽

Temperature Distributions ◽

Buoyancy Ratio ◽

Sinusoidal Temperature ◽

Brownian Motion Parameter

A numerical study of the natural convection flow in a porous cavity with wavy bottom and top walls having sinusoidal temperature distributions on vertical walls filled with a nanofluid is numerically investigated. The mathematical model has been formulated in dimensionless stream function and temperature taking into account the Darcy–Boussinesq approximation and the Buongiorno's nanofluid model. The boundary-value problem has been solved numerically on the basis of a second-order accurate finite difference method. Efforts have been focused on the effects of five types of influential factors such as the Rayleigh (Ra = 10–300) and Lewis (Le = 1–1000) numbers, the buoyancy-ratio parameter (Nr = 0.1–0.4), the Brownian motion parameter (Nb = 0.1–0.4), and the thermophoresis parameter (Nt = 0.1–0.4) on the fluid flow and heat transfer characteristics. It has been found that the average Nusselt and Sherwood numbers are increasing functions of the Rayleigh number, buoyancy- ratio parameter, and thermophoresis parameter, and decreasing functions of the Lewis number and Brownian motion parameter.

Download Full-text