Mohammed Hasnaoui

• PhD
• Principal Investigator at Cadi Ayyad University

Experimental results obtained using a photovoltaic thermal hybrid solar system are presented and discussed. This hybrid combination is an emerging technology that combines photovoltaic panels and solar thermal collectors in one bi-functional component providing both electrical and thermal energy. The main objective of this coupling is to improve th...

Back ground: This study addresses magnetohydrodynamic (MHD) natural convection involving non-Newtonian fluids. Focusing on the annular region between concentric circular and square cylinders, the research examines the impact of a vertical magnetic field and thermal radiation. Methods: The Multiple Relaxation Time Lattice Boltzmann Method (MRT-LBM)...

This study explored an air-based hybrid photovoltaic/thermal collector that integrates a standard PV panel with a thermal cooling device. This study focuses on comparing the electrical and thermal behavior of a PVT operating under distinct meteorological conditions in Morocco represented by the cities of Tetouan and Chichaoua, whose climates...

Double diffusion natural convection in a square cavity of rhombus shape is studied numerically in the case where the intensity of the internal heat generation overcomes the effect of the thermal buoyancy force. The study focuses mainly on the variation of the ratio of solutal and thermal volume forces by varying the parameter N in the range -5≤N≤5...

In this paper, a novel thermal lattice Boltzmann approach is proposed for the implementation of the thermal boundary conditions at the fluid-solid interface. The numerical code, developed on the basis of the new approach, was validated against reliable numerical data from the literature in the cases of both square and circular conducting blocks. An...

This study is a computational analysis of hydrodynamic and thermal behavior of combined natural and forced convection with a moving wall in a square enclosure containing an elliptical block. This inner block is exposed to a hot temperature. The enclosure is full of air which is cooled on its side walls by a low temperature. The remaining surfaces a...

This book covers advanced theories and methods in the field of heat and mass transfer, which are expected to improve thermal systems performance and energy efficiency. It reports on novel findings relating to a wide range of topics in industry, building, transportation and agriculture. Offering a good balance of fundamental and applied research, th...

This book covers advanced theories and methods in the field of heat and mass transfer, which are expected to improve thermal systems performance and energy efficiency. It reports on novel findings relating to a wide range of topics in industry, building, transportation and agriculture. Offering a good balance of fundamental and applied research, th...

In this work, we examined numerically the heat transfer by mixed convection coupled with surface thermal radiation in a square cavity with a moving wall, using the Lattice Boltzmann method. The cavity is discretely heated from its left and lower walls with a hot temperature and cooled from its right wall, while the upper wall is adiabatic and moves...

A numerical analysis of mixed convection flows and heat transfer in a square enclosure having a sliding wall containing an elliptical block heated by isothermal temperature has been carried out. The enclosure is full of air and cooling from its sides by a cold temperature, whereas the remaining walls of the enclosure are considered thermally insula...

The purpose of this paper is to study numerically laminar mixed convection in a multiple vented cavity. This enclosure is continuously heated by constant temperature from the bottom wall, while the other boundaries are presumably thermally insulated. The imposed water-Al2O3 nanofluid flow is injected or sucked. The Influences of various control par...

In the present paper, a three-dimensional natural convection induced by a heat generating block placed in the lower adiabatic surface of a cubical cavity is studied numerically. The upper surface of the cavity is maintained cold at a constant temperature, while the other surfaces are considered adiabatic. The cooling fluid is air (Pr = 0.72) and th...

This paper presents 2D simulations of Direct Carbon Fuel Cells (DCFC) performance. The impact of the operating parameters, such as porosity of the cathode and gas inlet concentration (dioxygen), on the latter performance is investigated. The in-house numerical code based on the Lattice-Boltzmann technic with the Multiple Relaxation Time (MRT) schem...

The authors examine the influence of a uniform magnetic field on the characteristics of thermal and dynamic behaviors of non-Newtonian fluid generated by natural convection in a tilted square cavity. TheMRT-LBM is employed to elucidate the main physical parameters’ effect, namely, the Hartmann number Ha (from 0 to 50) and the power-law index n (fro...

The combined impact of aLorentz force and volumetric heat generation on natural convection heat transfer and fluid flowin a square cavity are investigated numerically using MRT-LBM. The cavity is filled with a non-Newtonian fluid and submitted to a partial heating from below. The main physical parameters controlling the problem are the Hartmann num...

The present study confirms the robustness and the computational effectiveness of the lattice-Boltzmann method in simulating natural convection between a triangular isosceles heating body and a square outer cylinder isothermally cooled/(insulated) from its vertical/(horizontal) walls. The heated body is symmetrically placed on the vertical centerlin...

This paper reports an analytical, numerical and scale analysis study of free convective heat and mass transfer flows coupled with thermal diffusion effect in a slender vertical porous cavity subjected to cooperating lateral temperature and concentration gradients. The top and bottom walls of the cavity are assumed to be adiabatic and impermeable to...

5 0 5 ISSN 0 0 3 9-2-4 8 0 UDK 5 3 6. 2 Izvirni znanstveni članek C1,01 3 © Jcxjmsl o f Mechanical Engineering 4 7 (2 0 0 1 36,5 0"l-5 0 5 ISSN 0 0 3 9-2-4 8 0 UDC 5 3 6. 2 ABSTRACT Multiplicity o f solutions induced by opposing thermal and solutal buoyancy forces in a vertical porous layer subject to horizontal fluxes o f heat and mass is studied...

The laminar mixed heat convection coupled with the surface radiation in an inclined lid-driven square cavity was investigated numerically using the lattice Boltzmann method. The moving wall of the cavity was heated to a constant temperature, and the opposite cavity wall was cooled to a spatially varying temperature. The results of the study show th...

Heat transfer of nanofluid Fe3O4-H2O generated by natural convection and thermal radiation in a diamond-shaped receiving cavity has been investigated numerically. The lower and upper corners of the rhombic receiver are kept isothermal in such a way to provide heating from the lower corner parts and maintain adiabatic the remaining non active portio...

Lattice Boltzmann simulations of double-diffusive convection in a rectangular cavity differentially heated and salted are conducted in the presence of internal heat generation and Dufour and Soret effects. The study is performed for an aspect ratio A = 2, an external Rayleigh number RaE = 10^5, a Lewis number Le = 2, a buoyancy ratio N =-1, and a P...

Natural convection induced in an inclined heat sink assimilated to an open square cavity provided with a thin adiabatic partition is studied numerically using the multi-relaxation time (MRT) scheme of the lattice Boltzmann method (LBM). The cavity is isothermally heated through a wall facing the opening. The parameters governing the problem are the...

The present study deals with Soret and Dufour effects on the onset of double-diffusive natural convection in a horizontal Brinkman porous layer with a free-stress upper boundary. The thresholds of stationary, oscillatory, and subcritical bifurcations are derived on the basis of linear and non-linear analysis, as functions of the governing parameter...

The study focuses on the effect of adding a conductive coating material to a micro-pin fin heat sink on the rate of thermal energy evacuation using the Multiple-Relaxation-Time lattice Boltzmann method. The effect of the governing parameters such as Rayleigh number, Ra (104 ≤ Ra ≤ 106), relative thermal conductivity, kr (kr = 8.8 − 167.2) and thick...

In the present study, a multiple-relaxation-time lattice-Boltzmann method is considered to investigate double-diffusive natural convection in a cavity with heating and diffusing plate inside. The cavity is filled with a porous medium at representative elementary volume scale based on the generalized model. The heated plate is placed horizontally at...

This paper aims to investigate the effect of the water channel location, vis-à-vis of the PV module in a flat-plate photovoltaic thermal system (PV/T), on heat evacuation by means of mixed convection. Numerical simulations were performed for a two-dimensional inclined channel at an angle of 35°. The cold water enters with a constant temperature an...

The drying process is the most energy-demanding among all phosphate processing. The moisture diffusivity is the main parameter that controls the drying kinetics, and it specifies the importance of moisture transfer resistances. In this work, the water diffusivity was computed by gravimetric method at four temperature levels (30 °C, 40 °C, 50 °C, an...

A 2D Multiple-Relaxation-Time (MRT) lattice Boltzmann (LB) is used to simulate the coupled mixed convection and surface radiation in a square double lid-driven cavity. The parameters governing the problem are the inclination angle (0°≤γ≤180°), the emissivity of the walls (0≤ε≤1), the Reynolds number (Re=100), the Richardson number (0.01≤Ri≤100) and...

A special case that stands out in thermosolutal convection is that for which the thermal and solutal convection forces are equal and generate opposite effects (N = −1). This antagonistic effect between the two buoyancy forces is expected to generate unpredictable and unique behaviors when combined with thermodiffusion and internal heating phenomena...

In this work, we present a numerical study of the magnetic field effect on double diffusive natural convection in a square porous cavity saturated with an electrically conducting binary mixture. The cavity is heated from below and cooled from the top, while its vertical walls are adiabatic and maintained at constant but different concentrations. Th...

This work is focused on the numerical modeling of steady laminar mixed convection flow in a Ventilated inclined enclosure filled with water-Al2O3 nanofluid and heated from one side. A parametric study is conducted and a set of graphical results is presented and discussed to illustrate the effects of volume fraction of the nanoparticles (0 ≤ ϕ ≤ 0.0...

Thermo-diffusion and double-diffusion convection flows within multi-components enclosure subject to vertical and horizontal thermal gradients is investigated numerically and analytically. The focus of the present investigation is to determine the thresholds for oscillatory and stationary convection as function of the lateral heating factor and the...

Phosphate sludge generated at the end of the phosphate enrichment operations can be reused after being subject to drying processes. For efficient drying treatment and also for saving storage, the hygroscopic properties of the phosphate sludge have to be determined. In this paper, the adsorption and desorption behaviors were studied. The drying of p...

This paper reports an analytical and numerical study of thermosolutal convection in a Brinkman horizontal porous layer saturated with a binary mixture, destabilized by submitting it either to both heat and mass fluxes (a=0, with Soret effect) or only to a heat flux to recover the case of pure Soret effect (a=1). The analytical solution is derived b...

A 2D numerical unit cell mode of Direct Carbon Fuel Cell (DCFC) was developed to simulate the effect of the operating conditions on the performance of the latter considering the electrochemical reaction mechanism and mass transfer. The problem is solved numerically using the Lattice Boltzmann method with MRT scheme to simulate the gas flow inside t...

In this study, heat transfer of ferrofluid Fe3O4-H2O generated by Rayleigh-Bénard convection in a squarecavity is studied numerically in the presence of a vertical uniform magnetic field. The effect of the governingparameters, such as the Rayleigh number (𝑅𝑎 = 10^3 to 10^4), the volume fraction of nanoparticles (φ = 0% to 4%) and the Hartmann numbe...

Using Lattice Boltzmann Method (LBM), the mixed convection and surface radiation effect in a two-sided lid-driven square cavity is studied numerically with air as a working fluid. The numerical code is validated against results available in the literature. The parameters governing the problem are the emissivity of the walls, the Reynolds number and...

Solar desalination is emerging as a sustainable solution for water shortage in countries having limited access to conventional energy resources. This paper proposes an autonomous desalination system fully powered by solar energy. This system mainly consists of a salt gradient solar pond coupled to an organic Rankine cycle that drives the pumps of a...

In the present study, the enthalpy-based lattice Boltzmann method (LBM) with multidistribution function model is used to investigate the melting process engendered by a thin heater placed in the horizontal median plane of the cavity. The latter is cooled from its vertical walls by maintaining their temperature constant at TC, lower than the constan...

This paper reports on the multiplicity of steady state solutions and the effect of buoyancy ratio due to both heat and mass transfer on natural convection in a horizontal rectangular cavity filled with a power-law non-Newtonian fluid. The short vertical sides of the cavity are submitted to horizontal thermal and solutal flux densities, while its ho...

In this study, we examine the effect of a uniform external magnetic field on Rayleigh-Bénard convection in a square cavity filled with a ferrofluid. Numerical simulations are based on the Lattice Boltzmann method. The effects of physical parameters, which are the Rayleigh number, the Hartmann number, and the angle of inclination of the magnetic fie...

The present study is a 2D numerical model of direct carbon fuel cell (DCFC), conducted to study the effect of the operating temperature on the DCFC performance. The electrochemical reaction mechanisms and mass transfer are considered and the problem is tackled numerically using the Lattice-Boltzmann method with the MRT scheme to simulate the gas fl...

In this paper, thermo-diffusion (Soret effect) and diffusion-thermo (Dufour effect) effects on double-diffusive natural convection induced in a horizontal Brinkman porous layer with a stress-free upper boundary are investigated. The cavity is filled with a binary fluid and subjected to uniform fluxes of heat and mass on its long sides. An analytica...

Heat transfer induced by combined surface radiation and laminar natural convection in an open square cavity heated by three identical isothermal heat sources is studied numerically by using the multirelaxation time scheme of the lattice Boltzmann method. The working fluid is air. The heat sources, separated by adiabatic segments, are mounted on a v...

The present study deals with double diffusive convection within a horizontal well packed porous layer of finite aspect ratio where thermo-diffusion has a predominant effect on the convective flow stability. The porous layer is subject to vertical thermal and solutal gradients and a lateral heating flux. The investigation is focused on a special sit...

Two-dimensional numerical simulations are conducted to study natural convection flows and heat transfer characteristics in a square cavity confining conducting solid blocks. The initial solid block, of rhombus shape, is placed at the center of the cavity and subdivided following the mathematical formulae N = 4^l (l = 0, 1, 2 and 3). The solid block...

The present work deals with transient simulation of hydrodynamics and mass transfer in a direct carbon fuel cell (DCFC) using a hybrid Lattice Boltzmann and finite volume approach. A 2D mathematical model was developed to describe the transport phenomena in the different components of the direct carbon fuel cell (feed channels, anode, cathode and e...

The present study deals with numerical simulations of natural convection heat transfer and fluid flow in open square cavities partially heated with three discrete sources from the left vertical wall facing the one were an aperture is centrally located. The governing equations where solved based on a mesoscopic approach using the Multiple-Relaxation...

The characteristics of flow and heat transfer of Al2O3-water nanofluids flowing through a horizontal ventilated cavity is investigated numerically. The bottom wall is subjected to a sinusoidal hot temperature profile, whereas the other boundaries are assumed to be thermally insulated. In fact, the flow comes forcedly into the system from the bottom...

This work deals with transient modelling of a large-scale salt gradient solar pond (SGSP - 50000 m²) located in a semi-arid climate region. Three heat extraction methods (HEM) were considered. The first method is a reference one (Ref-HEM) that limits the heat draw to the heat storage zone using horizontal tubes. The second (VT-HEM) and third (HT-HE...

A two-dimensional numerical model is developed to simulate the behavior of a salt gradient solar pond (SGSP) of 1×1×1 m 3. The transient evolution of the SGSP covers the first 5 days of July 2011 under the weather conditions of Marrakesh-Morocco. The study aims to investigate the stability of the intermediate non-convective zone (NCZ) of the pond u...

The present work deals with transient simulation of the direct carbon fuel cell (DCFC) using a hybrid Lattice Boltzmann and finite volume approach. The numerical model was first validated against available experimental data. Then, a parametric study was carried out to investigate the effect of the specific surface area (SSA) of the carbon fuel on t...

Mixed convection in single and double-lid driven horizontal rectangular cavities filled with a Newtonian fluid and subjected to uniform heat flux along their vertical short sides is studied numerically and analytically. The finite volume method with the SIMPLER algorithm is used to solve the full governing equations for which the Boussinesq approxi...

In the present paper, numerical computations have been carried out to investigate the interaction between thermal radiation and laminar mixed convection in a multiple vented rectangular enclosure uniformly heated with a constant heat flux. Air, a radiatively transparent medium, is considered to be the cooling fluid which enters the enclosure by inj...

Thermosolutal natural convection heat and mass transfer in a 2D square cavity is studied numerically in the presence of Soret effect and uniform volumetric heat generation. A hybrid scheme with simple relaxation time lattice Boltzmann method (SRT-LBM) is used to obtain the velocity field while the temperature and concentration fields are deduced fr...

Thermosolutal convection under combined effects of thermodiffusion and internal heat generation has not been studied in the past despite its presence in many practical problems [1]. The present numerical study deals with natural convection induced in a square cavity heated/cooled from above/below with internal heat generation (that plays a destabil...

In the present study, the simulation of the direct carbon fuel cell (DCFC) using a hybrid Lattice Boltzmann and finite volume approach is performed. The numerical model was first validated against available experimental data. Parametric studies were carried out to investigate the effect of the microstructure of the carbon fuel on the DCFC performan...

The coupling between mixed convection and surface radiation in a square cavity, with a vertical wall heated and driven, and the opposite one subjected to a non-uniform temperature that exhibits a sinusoidal spatial variation is studied numerically using the lattice Boltzmann method. The working fluid is air. The inner surfaces of the cavity, in con...

Purpose The purpose of this paper is to study numerically thermosolutal natural convection within an inclined rectangular cavity in the presence of Soret effect and heat generation. The enclosure is heated and salted from its long sides with constant but different temperatures and concentrations. The study focuses on the effects of three main para...

The present study reports numerical results of natural convection with surface radiation in an inclined square cavity filled with air, using the Multi-Relaxation Time (MRT) scheme of the Lattice-Boltzmann method (LBM). The cavity is heated from one side with a constant temperature and submitted from the opposite side to a temperature that varies li...

Thermosolutal natural convection heat and mass transfer in a 2D square cavity are studied numerically in the presence of Soret effect and uniform volumetric heat generation. A hybrid scheme with simple relaxation time lattice Boltzmann method (SRT-LBM) is used to obtain the velocity field while the temperature and concentration fields are deduced f...

Purpose The purpose of this paper is to investigate numerically mixed convection of Al 2 O 3 -water nanofluids flowing through a horizontal ventilated cavity heated from below by a temperature varying sinusoidally along its lower wall. The simulations focus on the effects of different key parameters, such as Reynolds number (200 ≤ Re ≤ 5,000), nano...

This paper deals with transient modelling of a large-scale salt gradient solar pond (SGSP – 50000 m2) located in a semi-arid climate region. Precisely, the pond was exposed to meteorological data of the Agafay site (located 30 km south of Marrakesh-Morocco) covering the period from January 2015 to May 2017. We considered three different heat extrac...

An investigation is conducted to study analytically and numerically the effect of a magnetic field on the species separation induced by the combined effects of convection and Soret phenomenon in an inclined porous cavity saturated by an electrically conductive binary mixture and provided with four impermeable walls. The long sides of the cavity are...

An investigation is conducted to study analytically and numerically the effect of a magnetic field on the species separation induced by the combined effects of convection and Soret phenomenon in an inclined porous cavity saturated by an electrically conductive binary mixture and provided with four impermeable walls. The long sides of the cavity are...

The goal of this work is to study the laminar mixed convection of water-Al2O3 nanofluid in a multiple vented cavity. The effects of various controlling parameters, such as Reynolds number, 200 <=Re <= 3000, solid volume fraction of nanoparticles, 0 <=phi<= 0.7, and mode of imposed external flow (injection and suction) on flow and thermal patterns a...

In this work, we investigated numerically heat transfer by mixed convection coupled to thermal radiation in a vented rectangular enclosure uniformly heated from below with a constant heat flux. The fresh fluid is admitted into the cavity by injection or suction, by means of two openings located on the lower part of both right and left vertical side...

The problem of mixed convection heat transfer inside a horizontal vented enclosure through the lower and upper parts respectively of its left and right vertical walls is studied numerically using Al2O3-water nanofluid as working fluid. The bottom wall is subjected to a linearly varying (increasing or decreasing) heating temperature profiles, while...

Combined Soret and Dufour effects on thermosolutal convection induced in a horizontal layer filled with a binary fluid and subject to constant heat and mass fluxes are investigated analytically and numerically. The thresholds marking the onset of supercritical and subcritical convection are predicted analytically and explicitly versus the governing...

A two-dimensional numerical model is developed to simulate the behavior of a salt gradient solar pond (SGSP) of 1 × 1 × 1 m3. The numerical code takes into consideration double-diffusive convection in the pond, solar radiation absorption through the horizontal fluid layers, and allows an appropriate treatment of the boundary conditions at the water...

This paper reports an analytical and numerical study of double-diffusive natural convection in a Newtonian fluid contained in a horizontal rectangular enclosure submitted to uniform heat and mass fluxes along its short vertical sides, while the horizontal ones are insulated and impermeable. Rigid-rigid, free-free, rigid-free and free-rigid hydrodyn...

The present work deals with numerical modeling of mixed convection flow in a two-sided lid driven inclined square enclosure filled with water-Al2O3 nanofluid. The limiting cases of a cavity heated from below and cooled from above and the one differentially heated are recovered respectively for inclination angles 0° and 90°. The moving walls of the...

In the present work, Lattice Boltzmann Method (LBM) is used to analyze the natural convection flow and heat transfer in a square cavity with an inside thin heater. The vertical walls of the cavity are adiabatic, while its horizontal ones are maintained at constant temperature. The square cavity contains a thin vertical heated plate, with the temper...

A two-dimensional modeling is performed to study natural convection coupled with radiation in a square cavity partially heated from one vertical side and cooled from above. The simulation of flow and heat transfer is achieved by adopting the MRT scheme of the Lattice-Boltzmann method. In this work we focus on qualitative and quantitative effects en...

An hybrid Lattice-Boltzman finite-difference method is proposed to assess the impact of the inclination angle of the cavity on thermosolutal natural convection of a binary fluid confined in a square cavity differentially heated and salted from two opposite walls with constant temperatures and concentrations. This method seems more flexible in imple...

In the present paper, we study forced convection fluid flow and heat transfer generated in a square lid-driven cavity filled with the nanofluid water-Ag and provided with a horizontal thin heater. The horizontal boundaries of the cavity are insulated while its vertical walls are maintained at a constant temperature, lower than that of the heater de...

A two-dimensional numerical simulation is conducted to study natural convection flow and heat transfer characteristics in a square cavity filled with a micropolar fluid. The lower and upper walls of the cavity are respectively subject to isothermal heating and cooling while the temperatures of both vertical sides decrease linearly in the upwards di...

A two-dimensional numerical study is conducted to investigate quantitatively and qualitatively the thermal characteristics of a small-scale salt gradient solar pond (SGSP) operating under semi-arid climate (Marrakesh-Morocco). A realistic model was formulated based on the Navier-Stokes equations and the energy and salt transport equations. This dev...

A two-dimensional numerical study is conducted to investigate quantitatively and qualitatively the thermal characteristics of a small-scale salt gradient solar pond (SGSP) operating under real climate weather. A realistic model was formulated based on the Navier-Stokes equations and the energy and salt transport equations. The developed model ensur...

We study numerically the impact of the inclination angle of a rectangular cavity on thermosolutal natural convection in the presence of Soret effect and heat generation. The enclosure is differentially heated and salted from two opposite long sides with constant but different temperatures and concentrations while the short walls are considered adia...

In the present work, the lattice Boltzmann method (LBM) is applied to analyze the natural convection flow and heat transfer generated in a square cavity with an inside thin isothermal heater maintained at Th. The vertical walls of the cavity are considered adiabatic, while its horizontal ones are assumed isothermal at the temperature Tc (Tc < Th)....

Natural convection within a square inclined cavity filled with Al2O3-water nanofluid is investigated numerically. The temperature of the cooled surface is maintained constant, while that of the opposite surface (heating temperature) is varied sinusoidally in time. The remaining walls are considered adiabatic. The parameters governing the problem ar...

The characteristic of flow and heat transfer of Al2O3-water nanofluids flowing through a horizontal ventilated cavity is investigated numerically. The bottom wall is subjected to a linearly varying increasing heating temperature profile, whereas the other boundaries are assumed to be thermally insulated. The enclosure is cooled by an injected or su...