A modeling procedure is developed for natural convection heat transfer from an isothermal heated sphere located at the center of an isothermal, cooled, sphericalshaped enclosure. The model is based on the linear superposition of conduction and convection solutions, where the convective component is determined based on a combination of two limiting cases, laminar boundary layer convection and tr...

This study simulates natural convection flow resulting from heat partitions in an H-shaped enclosure filled with a nanofluid using incompressible smoothed particle hydrodynamics (ISPH) method. The right area of the is saturated non-Darcy porous media. center variable walls are kept at high-temperature Th. left and positioned low temperature Tc other adiabatic. In ISPH method, source term pressu...

The natural convection heat transfer of horizontal rectangle enclosures with different aspect ratios (A = 2:1 and A = 4:1) filled with Ag-Ga nanofluid (different nanoparticle volume fractions φ = 0.01, φ = 0.03, φ = 0.05 and radiuses r = 20 nm, r = 40 nm, r = 80 nm) at different Rayleigh numbers (Ra = 1 × 103 and Ra = 1 × 105) is investigated by a two-phase lattice Boltzmann model. It is found ...

Two-dimensional numerical study of flow and temperature fields for laminar natural convection and radiation in the inclined cavity is performed in the present work. The walls of the square cavity are assumed kept at constant temperatures. An absorbing, emitting, and scattering gray medium is enclosed by the opaque and diffusely emitting walls. The set of governing equations, including conservat...

A numerical study of the natural convection of the laminar heat transfers in the stationary state was developed in a horizontal ring and compared between a heated trapezoidal internal cylinder and a cold elliptical outer cylinder. This annular space is traversed by a Newtonian and incompressible fluid. The Prandtl number is set to 0.7 (air case) for different Rayleigh numbers. The system of equ...

The purpose of this study is to investigate the behaviour natural convection in a wavy trapezoidal enclosure that filled with nanofluid. left wall has wavelength, l, and amplitude, A. top bottom walls are adiabatic while side set constant temperature, shear stress occurs at enclosure. numerical approach used order discretize governing equations its boundary conditions finite element method wher...