Adel Benchabane

Université de Biskra · Department of Mechanical Engineering

In this work, a numerical model is carried out to investigate the magneto-hemodynamics of blood driven by an oscillating pressure gradient and exposed to a uniform magnetic field and an external body acceleration. The non-Newtonian nature of blood was taken into account using a time-dependent thixotropic model. Incompressible, axisymmetric, and lam...

The current study focused on the adaptation of adsorption cooling systems to hot and arid climates. A new combination is proposed to improve the performance of the direct evaporative cooler (DEC). This combined system consists in coupling Ground-Water Heat Exchanger (GWHE) with a DEC of a hybrid cooling tower. A mathematical model has been develope...

This study focuses on the reduction of the environmental impact of plastic waste and the valorisation of vegetal wastes produced annually from date palms. This paper presents an experimental study on the manufacturing of composite panels based on date palm leaflets, DPL, and expanded polystyrene wastes were carried out. Hot compression process was...

This paper concerns the thermal design of Earth-to-Air Heat Exchanger (EAHE). The paper presents new transient semi-analytical models to estimate i) the disturbed soil thermal resistance of EAHE pipe as a function of duration of operation and ii) thermal performance of EAHE operating under transient conditions. The main aim of this study is to eval...

This work presents a numerical technique for simulating non-Newtonian blood flow in human's arteries driven by an oscillating pressure gradient. The blood is considered as a thixotropic fluid and its structural properties are considered to obey Moore's thixotropic model as a constitutive equation. The equations of motion are simplified considering...

This paper presents an experimental investigation of a direct evaporative cooler, DEC, designed and installed in the hot and arid region of Biskra, Algeria. Date palm tree fibers are used as a novel evaporative cooling material. Different performance parameters are experimentally tested to assess the thermal performances of the DEC system. Results...

Many industries have recently focused on cost-effective materials with good mechanical properties. Steel fiber reinforced cementitious composites have proven their mechanical performance in industrial and structural components. The concept of recycled fiber-reinforced FGM is used as an alternative construction material, which can be one of the prop...

La présente invention vise à remédier aux inconvénients du couplage ‘machine frigorifique à adsorption / aéro-refroidisseur géothermal’ connu de l'art antérieur en reliant l’échangeur géothermal air-sol avec l’adsorbeur.

As one of the major functions of drilling mud is to maintain pressure inside a wellbore to avoid any invasion of unwanted high-pressure, this makes the determination of this pressure loss a very complicated task in the petroleum drilling industry. The aim of this paper is to predict the behaviour of drilling fluid flowing inside rotating pipe then...

In this study, iterative artificial bee colony algorithm (IABCA) methodology was proposed to perform optimization of a heliostat field for Solar Power Tower (SPT) system. In this respect, complete mathematical model of annual unweighted optical efficiency considering cosine losses, shadowing - blocking losses, atmospheric attenuation losses, interc...

In the current study, we present the optical efficiency of six different cavities receivers’ shapes that are mostly used in solar power tower systems. This study was realized in applied research unit for renewable energies (URAER) at Ghardaia province, (Algeria). Each heliostat reflects the sunray into the center point of the cavity aperture situat...

The purpose of this study is to present a technical solution to avoid the malfunction of air coolers and condensers when the ambient temperature exceeds the operating limits of these systems. These critical climatic conditions are obtained especially during scorching temperatures in hot climates. First, this article describes this technical solutio...

This study investigates the applicability of a hybrid cooling tower (HCT) of solar adsorption air-conditioning system in the hot working conditions of the region of Biskra, Algeria. A calculation method is presented to size the cooling tower and to define the main characteristics of the sprayed water. In addition, the effect of the ambient and humi...

This work presents an experimental study on a composite material obtained from vegetable and industrial wastes. The date palm leaflets waste was used as reinforcement in the form of short fibers, and the expanded polystyrene waste was recycled and used as a matrix for the preparation of the leaflets polystyrene composite material (LPC). The LPC mat...

The rheological properties of polyethylene oxide (PEO) solutions were investigated, at different temperatures, using small and large deformation rheological methods. Steady-state flow measurements showed that the flow behavior of the PEO solutions is well described by the Cross model, which yields the critical concentrations c* (from the dilute reg...

Ce travail présente une étude expérimentale réalisée sur un dispositif de réfrigération solaire à adsorption en utilisant le charbon activé AC ̶ 35 / méthanol comme couple de travail. Le dispositif étudié est conçu, réalisé et testé au niveau du laboratoire du froid et climatisation par énergie électrique d’origine renouvelable, FCEEOR, de l’Unité...

In this paper, a solar air heater collector is developed and investigated. A concentrating feature of Linear Fresnel Reflector and the characteristics of flat plate air heaters (LFRAH) collectors are used. In this experimental study, three configurations of the absorber used to improve the thermal performance of LFRAH for the drying and the space h...

In this paper, a solar air heater collector is developed and investigated. A concentrating feature of Linear Fresnel Reflector and the characteristics of flat plate air heaters (LFRAH) collectors are used. In this experimental study, three configurations of the absorber used to improve the thermal performance of LFRAH for the drying and the space h...

In this paper, we present an optical simulation of concentrating solar tower system using different forms of cavity receiver. Mathematical model used to find the position of the sun, angle of incidence, position of the reflected ray and orientation of heliostats is developed in MATLAB. For each heliostat, the angle of incidence is included in the c...

In this paper, natural convection heat losses in a cylindrical solar receiver are investigated numerically. The study is conducted using three helical tube diameters: 12mm, 16mm and 25mm. The diameter of the receiver is 0.3 m with an aspect ratio equal to one and three aperture ratios of 1, 0.75 and 0.5. In each case, the receiver tube inside the c...

In the current study; firstly, we give a quick look at the various cooling systems mentioned in the literature and their feasibility in the harsh Saharan summer climate of Biskra city. Then, we present the major obstacles that could prevent the functioning of these systems in the region of Biskra. Thus, we purpose a number of solutions specific to...

This work presents an experimental study of a solar adsorption refrigeration device using activated carbon AC-35 /methanol as working pair. The studied device is designed, realized and tested in the Development of Solar Equipment Unit, UDES, Tipaza (Algeria). The adsorption and desorption tests, carried out on the experimental device, were conducte...

In this paper, the feasibility of solar adsorption air conditioning system in the region of Biskra (Algeria) is studied. The main objective is to give a reflection on the current government support for electricity bills. A comparison between three air conditioning systems was made by taking into account economic and environmental constraints: class...

An interactive numerical process has been proposed to control the evaporating temperature of refrigerant for solar adsorption cooling machine with new correlation for the case of activated carbon AC35-methanol as working pair. The study has given a possibility to define the interactive relation between the evaporating temperature of refrigerant in...

La clé des systèmes d'adsorption est l'utilisation de l'adsorption pour la compression thermique du fluide de travail. Le lit d'adsorbeur est donc le composant le plus important du système, il est principalement constitué d'un échangeur de chaleur et d'un matériau adsorbant. Précisément. Le lit adsorbeur souffre d'un faible transfert de chaleur et...

In this study, a transient numerical model, referred as CBSR model, was developed for determining the operating temperatures and its corresponding times of the solar adsorption refrigeration cycle with activated carbon AC35-methanol pair for unsteady solar irradiation. The operating temperatures and its corresponding times obtained by the present m...

This article is the first in a series about the thermal design of Earth-to-Air Heat Exchanger, EAHE, using a new developed semi-analytical method. The temperature distribution in the soil surrounding the EAHE is studied in the goal to determine the soil radius as a function of the operation duration. This radius is the first distance from the pipe...

In the aim of environmental protection and valorization of vegetal resource, an experimental study on an innovative Wood-Plastic Composite material (WPC) based on Date Palm and expanded Polystyrene, EPS, Wastes is performed. Date palm leaflets waste are used as the reinforcement and EPS waste dissolved in gasoline is used as a matrix. Several combi...

This work presents a numerical investigation on heat transfer and fluid-dynamic aspects for a solar open cavities in an extended fluid flow domain. The vertical wall inside the open cavities facing the aperture is assumed to be isothermal while the other walls are kept insulated. Heat transfer steady laminar natural convection is studied by solving...

In this paper, natural convection heat losses in a cylindrical solar receiver are investigated numerically. The study is conducted using three helical tube diameters: 12mm, 16mm and 25mm. The diameter of the receiver is 0.3 m with an aspect ratio equal to one and three aperture ratios of 1, 0.75 and 0.5. In each case, the receiver tube inside the c...

L’objectif de ce travail est l’étude des échangeurs de chaleur liés aux systèmes de refroidissement solaire à adsorption. Nous avons choisi d’étudier l’effet de la température humide sur une tour de refroidissement hybride avec échangeur de type batterie à ailettes. A cet effet nous avons élaboré un code de calcul numérique pour dimensionner l’écha...

This paper presents a numerical study of heat transfer inside the adsorber-collector of a solar adsorption refrigerator using the activated carbon AC35-methanol pair. The objective is to estimate the amount of the heat loss through the adsorber-collector, during the solar heating phase, and to determine the effect of heating time on the thermal eff...

This work reports the results of an experimental study on the incorporation of wood waste date palm reduced in particles for the manufacture of wood – cement composites. These materials are chipper than the conventional insulator material and environmental friendly. Five types of wood – cement composites with various concentrations of the wood part...

This paper interests to the applicability of the solar adsorption air refreshment systems in the semiarid region of Biskra (Algeria) and the water cooling system was investigated. We proposed the replacement of the dry cooling tower (DCT) used in the main system with a supplementary water cooling system based on shallow geothermal energy by using e...

La présente invention vise l'utilisation des déchets industriels comme matrice et des déchets végétaux comme renfort pour la fabrication d’un nouveau matériau composite. Nous proposons la composition d’un matériau qui prend en compte les contraintes économiques et écologiques liées à la fabrication et à l’utilisation des matériaux composites en se...

The objective of this paper is to study the design of a condenser of a solar adsorption refrigerator which will be tested in the region of Biskra (Algeria). The LMTD (log mean temperature difference) method is used to calculate the size of the condenser applying experimental data obtained from the literature. For this purpose, a calculation code ha...

The aim of this work is the development of a 2D quadrilateral isoparametric finite element model, based on a layerwise approach, for the bending analysis of sandwich plates. The face sheets and the core are modeled individually using, respectively, the first order shear deformation theory and the third-order plate theory. The displacement continuit...

In this article, an experimental study is presented in two parts: First, the best performing solar dryer is selected between two models of flat plate solar collectors (FPCs). The second part investigates the drying behavior of henna (Lawsonia alba, syn. Lawsonia inermis Linn.) using the best selected FPC. The aim of this study is to get a clean pro...

This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the...

This research reports the results of an experimental study on the physical, chemical, and mechanical properties as well as the thermal behavior of eight varieties of date palm residues coming from the same environment. The aim is to evaluate each variety of this natural material to be used thereafter, individually or as a mixture, in the manufactur...

Résumé - Dans cette étude, nous présentons les résultats expérimentaux relatifs aux expériences menées sur des capteurs solaires plans à air. En premier lieu, nous décrivons les différentes configurations étudiées. De ce fait, nous avons opté à combiner trois solutions technologiques, à savoir, i) introduire différentes géométries de rugosités dans...

Dans cette étude, nous présentons les résultats expérimentaux relatifs aux expériences menées sur des capteurs solaires plans à air. En premier lieu, nous décrivons les différentes configurations étudiées. De ce fait, nous avons opté à combiner trois solutions technologiques, à savoir, i) introduire différentes géométries de rugosités dans la veine...

This work reports the results of an experimental investigation on physical and mechanical properties of Algerian date palm tree residues in order to optimize their performances when used as reinforcement. The results have shown that all the samples are characterized by porous and fibrous structure with irregular surface, which contains a large numb...

The increasing interest in the development of solar cooling technologies to their various economic and impressive environmental benefits, conducted us to study the feasibility of solar desiccant cooling systems in Algerian Sahara, particularly in the region of Biskra. Thus, we present in this paper, the results of an experimental investigation of s...

This patent came as a technological solution (easy to realize) of malfunction of refrigeration systems when the ambient temperature passes the operating limits of these systems. These critical climatic conditions are obtained especially during scorching temperatures of summer. The principle of this solution is to couple a heat exchanger of type fin...

The main heat exchangers of a solar adsorption refrigerator are: the collector, the evaporator and the condenser. The objective of this work is the study and sizing of the condenser of this type of cooling machines which will be tested in the region of Biskra (Algeria). This paper is based on the log mean temperature difference, LMTD, used for calc...

In this paper, the thermal buckling behavior of composite laminated plates under a uniform temperature distribution is studied. A finite element of four nodes and 32 degrees of freedom (DOF), previously developed for the bending and mechanical buckling of laminated composite plates, is extended to investigate the thermal buckling behavior of lamina...

Le but de ce travail est d’étudier l’effet du polyéthylène oxyde (PEO) (polymère non ionique), utilisé généralement dans la formulation des boues de forage, sur le comportement rhéologique de suspensions debentonite. Des mesures rhéologiques, granulométriques et zétamétriques ont été effectuées sur une suspension de bentonite, des solutions de PEO...

This paper presents an experimental study by comparing between the thermal performance of three types of solar air flat plate collectors, FPCs: (i) without obstacles, (ii) with rectangular obstacles, and (iii) with trapezoidal obstacles in the air flow duct. In order to determine the best performing model, we have proceeded to reversing the flow di...

This paper presents an experimental study, by comparing between the thermal performance of three types of solar air flat plate collectors for drying applications (indirect dryers): i) without obstacles, ii) with rectangular obstacles, iii) with a new form of obstacles (trapezoidal form) in the air flow duct, thus, we have proceeded to reversing the...

This paper presents the results of an experimental investigation for a new form of obstacles used in increasing the performance of air flat plate solar collector at Biskra (latitude 34°48'N and longitude 5°44'E), Algeria. The thermal efficiency between absorber plate and air in flat-plate solar collector has been enhanced by introducing obstacles r...

Le présent travail synthétise une partie d'une thèse de doctorat en cours à l'Université de Biskra. Il porte sur une étude exploratrice de développement de matériaux isolants à usage structural utilisant le bois de palmier dattier. Ce matériau de base est disponible sous forme de déchets ligno-cellulosiques générés annuellement à des quantités impo...