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Natural Convection of a Power-Law Nanofluid in a Square Cavity with a Vertical Fin

Fluid Dynamics & materials Processing 2024年第9期20卷 2091-2108页

作者： Amira m’hadbi m.ham.ed el ganaoui Haïkel Ben hamed Amenallah Guizani Khalid Chtaibi LERmAB Department of Transition and Energy Efficiency ProfessionsIUT H Poincaréde LongwyUniversity of LorraineLongwy54400France LPT Center for Energy Research and Technologies(Borj Cedria2084)University of Tunis El ManarTunis1068Tunisia LTI Department of Mechanical Engineering and ProductionIUTUniversity of Picardie Jules-VerneAmiens80025France

The behavior of non-Newtonian power-law nanofluids under free convection heat transfer conditions in a cooled square enclosure equipped with a heated fin is investigated *** particular,the impact of nanofluids,composed of water and Al_(2)O_(3),TiO_(2),and Cu nanoparticles,on heat transfer enhancement is *** aim of this research is also to analyze the influence of different parameters,including the Rayleigh number(Ra=10^(4)-10^(6)),nanoparticle volume fraction(φ=0%-20%),non-Newtonian power-law indexes(n=0.6-1.4),and fin dimensions(Ar=0.3,0.5,and 0.7).Streamlines and isotherms are used to depict flow and related heat transfer *** indicate that thermal performance improves with increasing Rayleigh number,regardless of the nanoparticle type or nanofluid rheological *** suggests that the buoyancy force has a significant impact on heat transfer,particularly near the heat *** Nusselt number is more sensitive to variations in Cu nanoparticle volume fractions compared to Al₂O₃and TiO₂.moreover,the average Nusselt numbers for power-law nanofluids with n1)are greater(smaller)than for Newtonian fluids due to the decrease(increase)in viscosity with increasing(decreasing)shear rate,at the same values of Rayleigh number Ra owing to the amplification(attenuation)of the convective ***,the most substantial enhancement is observed with Cu-water shear-thinning nanofluid,where the Nusselt number increases by 136%when changing from Newtonian to shear thinning behavior and by 154.9%when adding 16%nanoparticle volume ***,an even larger increase of 57%in the average Nusselt number is obtained on increasing the fin length from 0.3 to 0.7.

关键词： Heat transfer nanofluid non-Newtonian fluid natural convection

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Numerical modeling and Technico-Economic Analysis of a Hybrid Energy Production System for Self-Consumption: Case of Rural Area in the Comoros

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Journal of Power and Energy Engineering 2024年第5期12卷 24-59页

作者： Fahad maoulida mohamed Aboudou Kassim Rabah Djedjig Ahmed Ihlal m.ham.ed el ganaoui LERmAB Laboratory of Studies and Research on Wood Material IUT of Longwy University of Lorraine Cosnes-et-Romain Longwy France LEmA Energy and Applied Mechanics Laboratory Faculty of Sciences and Techniques University of Comoros Moroni Comoros IREmIS Institute University of Mayotte Mayotte France LmER Laboratory of Materials and Renewable Faculty of Sciences University Ibn Zohr BP Agadir Morocco

This study aims to provide electricity to a remote village in the Union of Comoros that has been affected by energy problems for over 40 years. The study uses a 50 kW diesel generator, a 10 kW wind turbine, 1500 kW photovoltaic solar panels, a converter, and storage batteries as the proposed sources. The main objective of this study is to conduct a detailed analysis and optimization of a hybrid diesel and renewable energy system to meet the electricity demand of a remote area village of 800 to 1500 inhabitants located in the north of Ngazidja Island in Comoros. The study uses the Hybrid Optimization model for electric Renewable (HOmER) Pro to conduct simulations and optimize the analysis using meteorological data from Comoros. The results show that hybrid combination is more profitable in terms of margin on economic cost with a less expensive investment. With a diesel cost of $1/L, an average wind speed of 5.09 m/s and a solar irradiation value of 6.14 kWh/m2/day, the system works well with a proportion of renewable energy production of 99.44% with an emission quantity of 1311.407 kg/year. 99.2% of the production comes from renewable sources with an estimated energy surplus of 2,125,344 kWh/year with the cost of electricity (COE) estimated at $0.18/kWh, presenting a cost-effective alternative compared to current market rates. These results present better optimization of the used hybrid energy system, satisfying energy demand and reducing the environmental impact.

关键词： Hybrid System Rural Area electrification Comoros Techno-Economic Analysis PV-Wind-Diesel-Battery meteorological Data HOmER Energy Pro

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A Comparative Study of Different Drying Processes for a Deformable Saturated Porous medium

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Fluid Dynamics & materials Processing 2023年第6期19卷 1339-1348页

作者： Nour el Houda Ben mustaphaa Ibtissem Boumnijel m.el-ganaoui Daoued mihoubi Laboratory of Wind Energy management and Waste Energy Recovery Research and Technology Center of EnergyHammam-LifTunisia Laboratory of Studies and Research on Wood material(LERmAB) University of LorraineLongwyFrance National Engineering School of monastir University of MonastirMonastirTunisia

Drying of a deformable saturated porous medium based on convective tempering is a novel method that can enhance energy efficiency and the quality of the dried product *** this experimental investigation,the performances of this specific technique are compared with those of a standard stationary drying process in terms of deformation,drying kinetics,moisture redistribution,and energy *** particular,the response of a deformable saturated porous medium(Kaolin)is *** results are critically discussed pointing out advantages and drawbacks.

关键词： Convective drying tempering convective drying energy consumption Kaolin

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Performance Analysis of a Solar Continuous Adsorption Refrigeration System

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Fluid Dynamics & materials Processing 2023年第4期19卷 1067-1081页

作者： Kolthoum missaoui Nader Frikha Abdelhamid Kheiri Slimane Gabsi m.ham.ed el ganaoui Lorraine University NancyFrance Gabes University GabesTunisia Sfax University SfaxTunisia Lorraine University LongwyFrance

A study is conducted on the performances of a solar powered continuous-adsorption refrigerator considering two particular days as references cases,namely,the summer solstice(June 21st)and the autumn equinox(September 21st).The cooling capacity,system performance coefficient and the daily rate of available cooling energy are *** main goal is to compare the performances of a solar adsorption chiller equipped with a hot water tank(HWT)with an equivalent system relying on solar collectors with no heat storage *** daily cooling rates for the solar refrigerator are found to be 102.4 kWh and 74.3 kWh,respectively,on June 21st and on September 21st,using a total collector’s area of 43.47 *** corresponding values for the adsorption chiller equipped with a hot water tank of 2 m3(and using a total collector’s area of 72.45 m2),are 127.1 kWh and 106.13 kWh,respectively.

关键词： Solar continuous adsorption refrigerator dynamic energetic study system performance hot water tank CPC collector thorough system variable heat source

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Navier Slip and Heat Transfer in a Nanofluid Due to a Stretching/Shrinking Sheet:An Analytical Study

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Fluid Dynamics & materials Processing 2022年第5期18卷 1551-1567页

作者： A.B.Vishalakshi U.S.mahabaleshwar m.el.ganaoui R.Bennacer Department of mathematics ShivagangotriDavangere UniversityDavangere577007India Institut Universitaire de Technologie de Longwy Universitéde Lorraine 186 rue de LorraineCosnes et Romain54400France LmT/ENS-Cachan/CNRS/UniversitéParis Saclay Cachan94235France

This paper is devoted to the analysis of the heat transfer and Navier’s slip effects in a non-Newtonian Jeffrey fluid flowing past a stretching/shrinking *** nanoparticles,namely,Cu and Al_(2)O_(3)are used with a water-based fluid with Prandtl number *** slip flow is assumed to occur when the characteristic size of the flow system is small or the flow pressure is very *** using the similarity transformations,the governing nonlinear PDEs are turned into ordinary differential equations(ODE’s).Analytical results are presented and analyzed for various values of physical parameters:Prandtl number,Radiation parameter,stretching/shrinking parameter and mass transpiration for the flow and heat *** considered problem is relevant to various physical applications in the field of engineering,e.g.,the production of certain materials,the preparation of plastic and rubber sheets and glass *** is shown that the considered nanofluid increases the thermal *** nanoparticles act as a heater by increasing the solid volume fraction and thermal *** versa,they can act as a cooler if the strength of magnetic field is *** flow strength decreases by increasing the values of Deborah number.

关键词： Nanofluid navier’s slip radiation ordinary differential equations

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Impact of Radiation and Slip on Newtonian Liquid Flow Past a Porous Stretching/Shrinking Sheet in the Presence of Carbon Nanotubes

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Fluid Dynamics & materials Processing 2023年第4期19卷 929-939页

作者： U.S.mahabaleshwar T.Anusha m.el ganaoui R.Bennacer Department of mathematics Davangere UniversityShivagangothriDavangere577007India Institut universitaire de Technologie de Longwy Universitéde Lorraine186 rue de LorraineCosnes et Romain54400France LmT/ENS-Cachan/CNRS/UniversitéParis Saclay Cachan94235France

The impacts of radiation,mass transpiration,and volume fraction of carbon nanotubes on the flow of a Newtonian fluid past a porous stretching/shrinking sheet are *** this purpose,three types of base liquids are considered,namely,water,ethylene glycol and engine ***,single and multi-wall carbon nanotubes are examined in the *** overall physical problem is modeled using a system of highly nonlinear partial differential equations,which are then converted into highly nonlinear third order ordinary differential equations via a suitable similarity *** equations are solved analytically along with the corresponding boundary *** is found that the carbon nanotubes can significantly improve the heat transfer *** potential application in cutting-edge areas is also discussed to a certain extent.

关键词： Carbon nanotubes porous media newtonian fluid radiation

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Galerkin finite element analysis of magneto-hydrodynamic natural convection of Cu-water nanoliquid in a baffled U-shaped enclosure

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Propulsion and Power Research 2020年第4期9卷 383-393页

作者： A.Zaim A.Aissa F.mebarek-Oudina B.mahanthesh G.Lorenzini m.Sahnoun m.el ganaoui BLSTE Laboratory Faculty of Science and TechnologyUniversity of MascaraMascaraAlgeria Labor atoire de Physique Quantique de La matiere et moderation mathematique(LPQ3m) Universite Mustapha Stambouli de MascaraMascaraAlgeria Department of Physics Faculty of SciencesUniversity of 20 Aoiit 1955-SkikdaSkikda2100Algeria Labor atoire des materiaux et Genie Energetique(LmGE) University of 20 Aout 1955-SkikdaSkikda2100Algeria Department of mathematics CHRIST(Deemed to Be University)Bangalore560029India Department of Engineering and Architecture University of Parma.Parco Area Delle Scienze 1H1/A43124ParmaItaly Labor atoire energetique de Longvy(FJV/LERmAB) Universite de LorraineFrance

In this paper,single-phase homogeneous nanofluid model is proposed to investigate the natural convection of magneto-hydrodynamic(mIID)flow of Newtonian Cu—H20 nanoliquid in a baffled U-shaped *** Brinkman model and Wasp model are considered to measure the effective dynamic viscosity and effective thermal conductivity of the nanoliquid ***'s effective properties such as specific heat,density and thermal expansion coefficient are modeled using mixture *** complicated PDS(partial differential system)is treated for numeric solutions via the Galerkin finite element *** pertinent parameters Hartmann number(1≤Ha≤60),Rayleigh number(10^(3)≤Ra≤10^(6))and nanoparticles volume fraction (0% ≤Ф≤4%) are taken for the parametric analysis, and it is conducted via streamlines and isotherms. Excellent agreement between numerical results and open literature. It is ascertained that heat transfer rate enhances with Rayleigh number Ra and volume fraction 0, however it is diminished for laiger Hartmann number Ha.

关键词： Natural convection Nanoliquid Rayleigh number Baffled U-shaped Nusselt number Galerkin finite element method

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Pressure-Driven Gas Flows in micro Channels with a Slip Boundary:A Numerical Investigation

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Fluid Dynamics & materials Processing 2020年第2期16卷 147-159页

作者： A.Aissa m.E.A.Slimani F.mebarek-Oudina R.Fares A.Zaim L.Kolsi m.Sahnoun m.E.ganaoui Laboratoire de Physique Quantique de la matière et modélisation mathématique(LPQ3m) University of MascaraMascaraAlgeria Department of Energetic and Fluid mechanics University of Science and Technology Houari BoumedieneAlgiers16111Algeria Depatment of Physics Faculty of SciencesUniversity of 20 août 1955-SkikdaSkikdaAlgeria mechanical Engineering Department College of EngineeringHaïl UniversityHaïl2240Saudi Arabia Laboratory of metrology and Energy Systems University of MonastirMonastir5000Tunisia LERmAB IUT LongwyUniversitéde LorraineCosnes et Romain54400France

In this paper,flow of slightly rarefied compressible nitrogen in microchannels has been investigated numerically for low values of Reynolds and mach *** 2D governing equations were solved using Finite element method with first-order slip boundary conditions(Comsol multiphysics software).A validation was performed by comparing with similar configuration from the *** was found that our model can accurately predict the pressure driven flow in *** interesting findings are reported about the Relative pressure,longitudinal velocity,mach number,effect of gas rarefaction and flow rate.

关键词： Pressure driven slip flow microchannels gas flow rarefactioneffect

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