Hamzeh Mustafa Duwairi

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• PhD in Mechanical Engineering
• Professor (Full) at University of Jordan

The present study assesses the constant surface heat flux on a 2D steady convective flow of a micropolar fluid. The flow occurs along a vertical impermeable flat plate immersed in a fluid‐saturated porous medium. Numerical methods are used to convert the governing partial differential equations to gather the locally equivalent ordinary differential...

This study examines the forced convection of a micropolar fluid (MPF) flow across a vertical permeable plate inside a porous medium. A similar solution is derived for a scenario involving a constant surface temperature. The system of transformed governing equations is addressed by employing a finite‐difference method. Notably, a parametric analysis...

This paper investigates the effect of corrugated surfaces on the wind turbines power output for both laminar and turbulent flows. Conservation principles including continuity and momentum equations, wind turbine power equations, and the corrugated surface equation have been implemented to build up a theoretical model then which has been solved usin...

Mathematical models and numerical solutions of Williamson fluid flow under influences of various boundary conditions provide important support to experimental studies in the solar energy field. Therefore, the present study is concerned with the effects of forced convection of the viscoelastic boundary layer on a horizontal plate embedded in saturat...

Williamson fluid flux and heat transfer characteristics over horizontal plate via a saturated porous medium at constant surface temperature are examined in this study to determine the impact of forced viscous dissipation. The flow is modeled using a Darcy-Forchheimer-Brinkman model based on conservation laws and associated governing equations. U...

This study was conducted to mathematically evaluate the impact of forced convection of viscous dissipation on a porous media filled with Williamson fluid and exposed to fixed surface heat flux. The technique of Darcy_Forchheimer_Brinkman was employed, then the non-dimensional equations were solved numerically over a flat plate by using bvp4c throug...

This study was conducted to mathematically evaluate the impact of forced convection of viscous dissipation on a porous media filled with Williamson fluid and exposed to fixed surface heat flux. The technique of Darcy_Forchheimer_Brinkman was employed, then the non-dimensional equations were solved numerically over a flat plate by using bvp4c throug...

In this work, the superheated vapor effect on liquid film condensation in a saturated porous medium using Forchheimer's model has been investigated analytically and numerically. The applied governing equations, the continuity equation, the Forchheimer equation, and the energy equation were transformed using the similarity transformation technique i...

This paper investigated the influence of the cooling of turbulent blowing air on the photovoltaic (PV) modules using the corrugation technique. The well‐known five‐parameter diode equation side by side with conservation principles were used to study the effect of corrugating lower PV sides to cool PV's and enhance efficiency. As the main restrictio...

The paper intends to analyze numerically the effect of forced convection with viscoelastic boundary on porous media subjected to constant heat flux on the surface. The modified Navier–Stokes equations in nondimensional forms are formulated and modeled with Darcy–Forchheimer–Brinkman to solve the equations using bvp4c with MATLAB package. The numeri...

It is challenging to select the area that best fit the installation of wind turbines within complex and forestry terrains. This study aims to highlight the effects of corrugated surfaces on the characteristics of a turbulent wind flow, and on the performance of a wind turbine installed within this topography. It is hypothesized that a sinusoidal wa...

The evacuated tube solar collector is a proper choice for converting solar energy into heat since it is efficient, practical, and cost-effective. In the current study, the role of nanofluid in porous medium was numerically investigated to improve the performance of a solar collector model and the potential to store energy. The governing equations f...

Forced convection of Williamson fluid flow in porous media under constant surface heat flux conditions is investigated numerically. A model of Darcy–Forchheimer–Brinkman is used and the corresponding governing equations are expressed in dimensionless forms and solved numerically using bvp4c with MATLAB package. Boundary layer velocity, shear stress...

The evacuated tube solar collector is considered an efficient, convenient, and economical option used to convert solar energy into heat. In this work, enhancement of evacuated tubes solar collector performance and the potential for energy storage by using Al2O3 water-based nanofluid embedded in Graphite as a saturated porous media was presented and...

The forced convection heat transfer of non-Newtonian Williamson fluid in porous media is studied. The Darcy-Forchheimer-Brinkman model is adopted. The velocity and temperature boundary layers over an isothermal horizontal flat plate are considered. The governing equations are transformed into dimensionless form using similarity variables. The syste...

Thermal energy storage systems are used mainly in buildings and industrial processes. In this study, solar energy storage by using a circular conduit filled with porous media that is saturated by a non-Newtonian fluid at constant heat flux was represented. The fully developed region was studied by solving the equations analytically, the non-Newton...

The laminar film liquid condensation saturated in a porous medium is studied by using Forchheimer models, with and without shear stress. The models are based on the classical analysis carried out by Nusselt. For both models, the closed form expression is obtained for film thickness condensate, mass flow rate, convection heat transfer coefficient, l...

Solar panels are the most widely deployed renewable energy systems worldwide, providing a good amount of electrical power in a small area compared to other renewable energy systems. In the summer the temperature of the solar panel is increased and the efficiency of the solar panel is decreased. A cooling manner is required to maintain the temperatu...

The forced convection heat transfer of non-Newtonian Williamson fluid in porous Media is studied. The Darcy-Forchheimer-Brinkman model is adopted. The velocity and temperature boundary layers over an isothermal horizontal flat plate are considered. The governing equations are transformed into dimensionless form using similarity variables. The syste...

In this, work the slip velocity and temperature jump effects on convection from a vertical plate embedded in porous media using a Darcy model has been investigated numerically. Governing equations, continuity, Darcy law, and energy were transformed into dimensionless form using a set of suitable variables and then solved numerically using a finite...

The thermal dispersion effects on the Darcy-Forchheimer natural, mixed and forced convection heat transfer with viscous dissipation effects over an isothermal vertical flat plate in a fluid saturated porous media are examined numerically. The coefficient of thermal diffusivity has been assumed to be the sum of molecular diffusivity and the dispersi...

In this present study the stability of horizontal porous layer heated from below using Forchheimer's model is studied numerically. A uniform heat is applied for heating and cooling the two opposing walls of the enclosure while the other two walls are adiabatic. The Forchheimer extension of Darcy and energy equations are going to be transformed into...

Atrium is popular element in mercantile buildings, covered shopping mall, airport terminals, and sport arenas. In the event of a fire, these buildings overwhelmingly necessitate the use of a mechanical ventilation system to provide conditions to achieve safe escape route for the building occupants. This manuscript deals with mechanical ventilation...

In this work the temperature jump effects on convection from vertical plate embedded in porous media using Darcy model has been investigated numerically. The governing equations: continuity, Darcy law and energy were transformed into dimensionless form using a set of suitable variables then solved numerically using a finite difference method. Resul...

The process of sound propagation in a saturated porous medium with ideal gas behavior was studied inside the pores under the boundary layer approximations assumptions. It is found that the main three parameters that governs the propagation process are: the Darcy number,shear wave number and the porosity. The propagation process is going under isent...

Abstract—This work deals with heat and mass transfer by steady laminar boundary layer flow of a Newtonian, viscous fluid over a vertical flat plate with variable surface heat flux embedded in a fluid saturated porous medium in the presence of thermophoresis particle deposition effect. The governing partial differential equations are transformed...

In this work slip velocity effects on convection from a vertical plate embedded in saturated porous medium using the Darcy model are investigated numerically. The governing equations-continuity, Darcy law, and energy-are transformed into dimensionless form using a suitable set of dimensionless variables. The equations are solved numerically using a...

A fully nonlinear wave analysis is performed for an acoustic wave which propagates through an isentropic porous medium under the boundary layer approximations. It is found that the main three parameters that govern the propagation process are reduced frequency parameter, Re = ρKω/ μ; Forchheimer's number, Fr = ā/√Kω; and porosity, ε. The propagatio...

the following dimensionless parameters are found to describe the problem which are namely the modified Rayleigh number (Raw), the inclination angle (φ), the apect ratio of the enclosure (A), and the exponent for non-Boussinesq-approximation (n). It was found that the increasing of the modified Rayleigh number Raw increased the mass flow rates and t...

Because of the widespread use of porous media in most of life aspects such as sound absorption, a hundreds of researches were conducted to study the behavior of such media under many conditions. One of the most important parameter of such media is the permeability and therefore it is found in many of the recent literature. However, most of the rece...

The problem of sound propagation over flat plate of porous media was investigated at both stationary and movable flow conditions with a simple geometrical interfere where the permeability is assumed to be exponentially decaying in the normal direction and the thickness is optimized according to the maximum attenuation. It is found that the main par...

In this research, the effect of varying permeability on none – isentropic sound wave propagation in porous layer lied over flat plate was under investigation. The continuity, momentum and energy equations were derived, linerized and solved respectively by using the hydrodynamic / acoustic splitting method, the suitable variational solution and Eule...

In this study, the magnetohydrodynamics (MHD) natural convection heat transfer with Joule and viscous heating effects inside an iso-flux porous medium-filled inclined rectangular enclosure is studied numerically. An iso-heat flux is applied for heating and cooling the two opposing walls of the enclosure while the other walls are adiabatic. The Forc...

In this paper, the viscoelsatic boundary layer flow and the heat transfer near a vertical isothermal impermeable surface and in a quiescent fluid are examined. The governing equations are formulated and solved numerically using MackCormak’s technique. The results show excellent agreement with previously published results by a comparision. Represent...

It is shown that the three main parameters governing the propagation of sound waves in a fluid contained in rigid cylindrical tubes filled with a saturated porous media are the shear wave number s = R ¯ ρω/µ, porosity ϕ, and the Darcy number Da = R 2 /K. A variational solution of the problem with isentropic wave propagation in a cylindrical tube in...

In this present study the magnetohydrodynamics (MHD) natural convection iso-flux problem inside a porous media filled inclined rectangular enclosures is studied numerically. An iso-heat flux is applied for heating and cooling the two opposing walls of the enclosure while the other two walls are adiabatic. The Forchheimer extension of Darcy-Oberbeck...

It is shown that the three main parameters governing the propagation of sound waves in a fluid contained in rigid cylindrical tubes filled with a saturated porous media are the shear wave number s = R root(rho) over bar omega/mu, porosity phi, and the Darcy number Da = R(2)/K. A variational solution of the problem with isentropic wave propagation i...

In this work, the magnetohydrodynamics (MHD) natural convection heat transfer problem inside a porous medium filled with inclined rectangular enclosures is investigated numerically. The boundary conditions selected on the enclosure are two adiabatic and two isothermal walls. The governing equations, continuity, and Forchheimer extension of the Darc...

A rigid frame, cylindrical capillary theory of sound propagation in porous media that includes the nonlinear effects of the Forchheimer type is laid out by using variational solutions. It is shown that the five main parameters governing the propagation of sound waves in a fluid contained in rigid cylindrical tubes filled with a saturated porous med...

Purpose – The purpose of this paper is to study thermophoresis particle deposition and thermal radiation interaction on natural convection heat and mass transfer by steady boundary layer flow over an isothermal vertical flat plate embedded in a fluid saturated porous medium. Design/methodology/approach – The governing partial differential equation...

This work deals with thermophoresis particle deposition and thermal radiation interaction on mixed convection heat and mass transfer by steady laminar boundary-layer flow over a nonisothermal vertical flat plate embedded in a fluid-saturated porous medium. The governing partial-differential equations are transformed into nonsimilar form by using a...

This work deals with thermophoresis particle deposition on natural convection heat and mass transfer by steady laminar boundary layer flow over an isothermal vertical flat plate embedded in a fluid-saturated porous medium. The governing partial differential equations are transformed into nonsimilar form by using a special transformation, and then t...

It is shown that the three main parameters governing the propagation of sound waves in a fluid contained in rigid cylindrical tubes filled with a saturated porous medium are the shear wave number s Combining double low line R√(ρω/μ), the porosity ε, and the Darcy number Da Combining double low line R/√(K). A variational solution of the problem with...

The effect of a fluctuating Lorentz force on the AC magnetohydrodynamic micropump is studied. A two-dimensional transient developing laminar flow is modeled. The governing Navier-Stokes equations are solved numerically using the finite-difference method and the SIMPLE algorithm. The effect of the Hartmann number on the transient and steady-flow vel...

The effect of fluctuating Lorentz force on the Ac magnetohydrodynamic micropump is studied. A two-dimensional transient fully developed laminar flow and temperature distribution are modeled. The governing Navier–Stokes and energy equations are solved numerically by a finite-difference (ADI) method. The effect of different parameters on the transien...

The viscoelastic boundary layer flow and mixed convection heat transfer near a vertical isothermal surface have been examined in this paper. The governing equations are formulated and solved numerically using an explicit finite difference technique. The velocity and temperature profiles, boundary layer thicknesses, Nusselt numbers and the local ski...

The combined effects of forced and natural convection heat transfer in the presence of transverse magnetic field form a vertical surfaces with radiation heat transfer is studied. The buoyancy aided flow and the buoyancy opposing flows are investigated with viscous dissipation effects included in the governing equations. It is found that four parame...

The viscoelastic boundary layer flow and mixed convection heat transfer near a vertical isothermal surface have been examined in this paper. The governing equations are formulated and solved numerically using an explicit finite difference technique. The velocity and temperature profiles, boundary layer thicknesses, Nusselt numbers and the local ski...

Purpose The aim of this paper is to formulate and analyze thermophoresis effects on mixed convection heat and mass transfer from vertical surfaces embedded in a saturated porous media with variable wall temperature and concentration. Design/methodology/approach The governing partial differential equations (continuity, momentum, energy, and mass tr...

In this study, the combined effects of natural and forced convection heat transfer for a power law nonNewtonian fluid around a cylinder or sphere embedded in a porous media with the presence of heat generation or absorption is investigated. The governing equations were solved using the Keller box methods, and the solutions are obtained for the non-...

A 2-dimensional model is developed to investigate fluid flow in a magneto-hydrodynamic (MHD) micropump. The transient, laminar, incompressible, and developing flow equations are numerically solved using the finite difference method and the SIMPLE algorithm. The micropump is driven using the Lorentz force, which is induced as a result of interaction...

We investigated the lowest-energy structures of Au, Ag and Cu clusters up to octamer using model core potentials (MCPs). We utilized several levels of theory, such as density functional theory (B3LYP, BLYP, PBEPBE, LC-BLYP, LC-BOP), second-order perturbation ...

The effects of oscillating plate temperature on transient mixed convection heat transfer from a porous vertical surface embedded in a saturated porous medium with internal heat generation or absorption are studied. The governing equations are transformed into dimenionless form by a set of variables and solved using the Galerkine finite element meth...

The steady state viscoelastic boundary layer flow for the forced convection heat transfer is examined in this paper. The governing equations are formulated and solved numerically using an implicit finite difference technique. The velocity and temperature profiles, boundary layer thicknesses, Nusselt numbers and local skin friction coefficients are...

A study of transient fully developed laminar flow and temperature distribution in a magnetohydrodynamic (MHD) micropump is presented. The micropump is driven using the Lorentz force which is induced as a result of interaction between an applied electric field and a perpendicular magnetic field. The governing equations are solved analytically by an...

In this paper, the magnetohydrodynamic mixed convection flow about an isothermal cone embedded in a saturated porousmedium is considered. The Darcian model including the viscous dissipation effects in the energy equation is used. Thegoverning equations are transformed by using a set of nonsimilarity variables and solved by using Keller box method....

Analysis has been carried out to determine the effects of uniform magnetic field on the combined forced and free convection flow of an electrically conducting fluid over a non-isothermal body with elliptic shape in a saturated porous medium. The continuity, Darcy law and energy equations are transformed into non-dimensional form then solved numeric...

In this study, the combined effects of natural and forced convection heat transfer for a power law non-Newtonian fluid around a cylinder or sphere embedded in a porous media is investigated. The governing equations were solved using the Keller box method, and the solutions are obtained for the nonsimilarity parameter ζwhich represents the strength...

A theoretical model describing a magnetohydrodynamic (MHD) micropump is presented. An applied electric field interacts with a perpendicular magnetic field to induce Lorentz force. The Lorentz force is used to pump electrically conducting liquids along a micro channel. A two-dimensional fully developed flow is modeled where the velocity profile unde...

Magnetohydrodynamic (MHD) forced convection heat transfer from radiate surfaces in the presence of a uniform transverse magnetic field, with conductive fluid suction or injection from a porous plate is considered. A set of solutions to the non-linear equations is presented using the Keller box method. It is found that increasing the magnetic influe...

In this paper, numerical solutions for the effect of thermal radiation on mixed convection of optically dense viscous fluids about a nonisothermal cylinder and sphere is presented. The governing equations are transformed by using a set of nonsimilarity variables and solved by using the Keller box method. Numerical results for the dimensionless velo...

The majority of studies of transient laminar magnetohydrodynamic MHD free convection over a vertical isothermal plate concern gases and air. The existing results for water have been produced assuming a linear relationship between fluid density and temperature. However, it is known that the density relationship for water is nonlinear at low temperat...

The combined effects of forced and natural convection heat transfer in the presence of transverse magnetic field over a vertical hollow cylinder embedded in a porous medium are studied. The viscous dissipation effects are included in the energy equation. The entire mixed convection regime is covered by non-similarity parameter ς, including two limi...

Purpose – To highlight the effect of viscous and Joule heating on different ionized gases in the presence of magneto and thermal radiation effects. Design/methodology/approach – The conservation equations are written for the MHD forced convection in the presence of thermal radiation. The governing equations are transformed into non-similar form usi...

Oscillating plate temperature effects on transient mixed convection heat transfer from a porous vertical surface with internal heat generation or depletion are considered. The governing equations are transformed into dimensionless form by a set of variables and then solved using the finite element method. It is found that the velocity inside the bo...

In recent years, the dynamics of micropolar fluids, originated from the theory of Eringen, has been a popular area of research. As the fluids consist of randomly oriented molecules, and as each volume element of the fluid has translational as well as rotational motions, the analysis of physical problems in these fluids has revealed several interest...

An analysis has been developed in order to study the flow and heat transfer on a continuously stretching surface in a viscous electrically conducting fluid, in the presence of a magnetic field. The governing partial differential equations for this investigation are transformed into ordinary differential equations using similarity variables. The res...

The influence of radiation on free convection of an optically thick incompressible fluid past an isothermal vertical wavy surface is studied. The boundary-layer regime with very large Grashof number is considered and the wavy surfaces is assumed to have amplitude and wave length O(1). Using the appropriate transformation, the basic governing equati...

The unsteady squeezing and extrusion of a viscous fluid between two parallel plates of constant temperature is examined. The dimensionless extrusion parameter,Ω=U/V, is introduced to represent the effects of the extrusion on the squeezing velocities. The squeezing parameterω=VH/υ, represents the effect of the inertial forces on heat and fluid flow...

Thermal radiation heat transfer effects on the Rayleigh flow of gray viscous fluids under the effect of a transverse magnetic field are investigated. The free convection heat transfer problem from constant surface heat flux moving plate is selected for study. It is found that the increasing of the magnetic field number M=σ H 02 υ /ρ U 02decreased v...

Magnetohydrodynamic natural convection heat transfer from radiate vertical surfaces with fluid suction or injection is considered. The nonsimilarity parameter is found to be the conductive fluid injection or suction along the streamwise coordinate = V{4x/2 g(T w – T )}1/4. Three dimensionless parameters had been found to describe the problem: the...

A dimensional analysis on the solar pond was carried out to study the effect of solar pond surface area, solar radiation heat flux, effective water-salt thermal conductivity, water coefficient of natural convection heat transfer, depth of solar pond, water density, water specific heat, and transient time on the performance of solar pond. The result...

The MHD-natural convection heat transfer problem from radiate surfaces with constant surface temperature to conductive gray fluids is considered. The effect of both stationary and moving magnetic fields is included in the momentum equation. It was found that the increasing of the magnetic field number M = σH02B2 /σv decreased the velocity for the s...

Non-Darcy mixed convection in a porous medium from horizontal surfaces with variable surface heat flux of the power-law distribution is analyzed. The entire mixed convection regime is divided into two regions. The first region covers the forced convection dominated regime where the dimensionless parameter ζf =Ra*x /Pe2x is found to characterize the...

Mixed convection in a porous medium from a vertical plate with variable wall temperature is investigated. The entire mixed convection regime is divided into two regions and two sets of transformations are used. The first region is for the forced convection dominated regime (FCDR) and the other one is for the natural convection dominated regime (NCD...

Mixed convection in a porous medium from a vertical plate with variable wall temperature is investigated. The entire mixed convection regime is divided into two regions and two sets of transformations are used. The first region is for the forced convection dominated regime (FCDR) and the other one is for the natural convection dominated regime (NCD...

This work investigates analytically the wall effect on the mixed convection from a horizontal plate embedded in porous media. Variable surface heat flux is assumed at the plate. The wall effect due to no-slip boundary condition at the wall is introduced using the Brinkman model. Two sets of transformations are used, one for the forced convection do...