Gazy F. Al-Sumaily

University of Technology, Iraq · Energy and Renewable Energies Technology Center

Numerical investigation about unsteady mixed convective flows throughout a horizontal porous layer confined by two plates heated locally isothermally from below, is performed to probe elaborately the oscillatory flow conduct.

This is a numerical investigation of the unsteady mixed convective flow over an isothermally heated circular cylinder. The flow is directed vertically downwards with buoyancy forces in the opposite direction. A parametric analysis was conducted at five Reynolds numbers Re = 10, 20, 30, 40, 100, and for Richardson numbers between Ri = 0 and 0.5, to...

In the literature, there are some conclusions seem to be conflicting about the effect of porous structure of a packed bed of spheres, in particular the effects of the sphere diameter and the porosity on the heat transfer by convection. For this reason, the present numerical analysis investigates the effects of these two parameters on natural convec...

This review summarises first the studies that have been performed to date for establishing a suitable model for mixed convection phenomenon in packed beds with working fluids include some simplifying assumptions such as local thermal equilibrium (LTE) condition, neglect of channelling effect, and neglect of thermal dispersion effect. It was found t...

Local thermal equilibrium (LTE) is a frequently-employed hypothesis when analysing con- vection heat transfer in porous media. However, investigation of the non-equilibrium phenomenon exhibits that such hypothesis is typically not true for many circumstances such as rapid cooling or heating, and in industrial applications involving immediate transi...

In this work, transient mixed convection heat transfer and fluid flow in a horizontal porous layer bounded by two impermeable plates with a localised heating from below is numerically studied. The study is conducted using the Brinkman-Forchheimer-extended Darcy model and the one-equation energy model based on the assumption of local thermal equilib...

Mixed convection heat transfer in a vertically oriented air-cooled square enclosure is simulated numerically using the finite volume method. The vertical left wall being heated and all others are considered insulated. The effects of six opposite and staggered inlet/ outlet openings' locations over the top and bottom walls are investigated, with dif...

Transient combined forced and natural convection in a square enclosure vertically ventilated and stuffed with an air-saturated fibrous material is studied numerically. This investigation employs the full Brinkman-Forchheimer-extended Darcy model for estimating the fluid flow, coupled with the one-equation energy model for estimating the temperature...

eccentric cylinders is presented. The cylinders are impermeable to fluid motion and retained at uniform different temperatures. While, the annular porous layer is packed with glass spheres and fully-saturated with air, and the cylindrical packed bed is under the condition of local thermal non-equilibrium. The mathematical model describing the therm...

In this study, we perform a numerical investigation to better comprehend the domination and the effect of strong thermal buoyancy on hydrodynamic and thermal characteristics, vortex shedding in particular, of a horizontal circular heated cylinder subject to a vertically upward laminar flow stream. The Reynolds number is varied in the range 20 ≤Re≤...

A numerical study is performed to investigate mixed convective flow in a vertically vented square enclosure with heating or cooling one of the vertical walls and the other three walls are insulated. This study is conducted to analyse and clarify the intricate interaction between the buoyancy-induced flow and the pressure-driven external flow in a v...

The characteristics of fluid flow and forced convection heat transfer around a bank of four circular cylinders embedded in a metallic or non-metallic porous materials have been investigated numerically. Both a staggered and an in-line arrangement have been studied. The governing continuity, Darcy-Brinkman-Forchheimer momentum, and local thermal non...

This paper examines the changes to the flow and heat transfer induced by a non-zero mean sinusoidally varying flow past a cylinder. This is done by simulating steady and pulsatile forced convective flows over a circular cylinder placed in either a horizontal empty or a porous medium filled channel. The incompressible Navier-Stokes equations are use...

The validity of the local thermal equilibrium assumption in the forced convection steady and pulsatile flows over a circular cylinder heated at constant temperature and embedded in a horizontal porous channel is investigated. For this purpose, the Darcy–Brinkman–Forchheimer momentum and the local thermal non-equilibrium energy models are solved num...

The present study numerically investigates the enhancement of forced convective heat transfer from a single circular cylinder embedded in a packed bed of spherical particles confined by two impermeable parallel plates. The heat transfer results from the heated cylinder, with and without the presence of a porous medium, are compared. The results sho...