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The Effect of the Fin Length on the Solidification Process in a Rectangular Enclosure with Internal Fins

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Fluid Dynamics & Materials Processing 2019年第2期15卷 125-137页

作者： Laila Khatra Hamid el Qarnia mohammed el ganaoui Cadi Ayyad University Faculty of Sciences SemlaliaDepartment of PhysicsP.O.2390Fluid Mechanics and Energetic(affiliated to CNRSTURAC 27)MarrakeshMorocco Lorraine University Energetic Laboratory of Longwy(FJV/LERMAB)Henri PoincaréInstitute of LongwyFrance

The aim of the proposed work is to study the solidification process within a rectangular enclosure provided with three internal rectangular fins attached to the left vertical wall of the *** latest is filled with a phase change material(PCM),initially liquid,at a temperature above its melting *** solidification process was initiated by cooling the left wall and fins to a temperature lower than the melting *** order to study and examine the thermal behavior and thermal performance of the proposed system,a mathematical model,based on the conservation equations of mass,momentum and energy was *** governing equations and their associated boundary and initial conditions were next ***,several controlling parameters were *** volume control method was used to discretize the *** resulting algebraic equations were solved *** investigations were carried out to study and examine the effect of the dimensionless fin length on the hydrodynamic and thermal fields of the flow,the dimensionless heat flux,the solidified mass fraction and the dimensionless time of complete solidification.

关键词： Phase change material solidification enthalpy method fins rectangular enclosure

Some Advances in Applications of Lattice Boltzmann Method for Complex Thermal Flows

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Advances in Applied Mathematics and Mechanics 2010年第5期2卷 587-608页

作者： Ridha Djebali Habib Sammouda mohammed el ganaoui University of Tunis el-Manar FS of TunisDepartment of PhysicsLETTM1060 TunisTunisia CNRS/SPCTS UMR 6638FST of LimogesDepartment of Physics87060 LimogesFrance

Over the past two decades,there have been enormous advances in lattice Boltzmann(LB)numerical simulation and *** lattice Boltzmann method has become a practical and promising tool for many fluid problems.A majority of recent studies have relied on numerical computations of isothermal ***,much less efforts have been devoted to complex thermal flows,such as flows in porous media subjected to external magnetic force,flows with temperature-dependent *** this paper,an overview is made based on some accomplishments in these numerical *** with the paper’s sections,the state-of-the-art trend and the LBM advances in modelling and in computational aspects for specific classes of problems of major interest will be fully touched *** remarks are given and the axis of our future studies will be traced.

关键词： LB method Bifurcations and instability porous media flows plasma jets

Performance of a Solar-Biomass Adsorption Chiller

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Fluid Dynamics & Materials Processing 2023年第4期19卷 1015-1026页

作者： Najeh Ghilen mohammed el ganaoui Slimane Gabsi Riad Benelmir Energy WaterEnvironment and Process LaboratoryNational School of Engineering of Gabes University of GabesOmar Ibn ElKhattabGabesTunisia National Engineering School of Sfax SfaxTunisia Faculty of Sciences and Technology/UIT Longwy Lab.LERMAB(UdL/INRA/Labex ARBRE) University of LorraineNancyFrance

A dynamic model is presented for a chiller working with a composite adsorbent(silica activated carbon/CaCl2)–water pair in a solar-biomass cooling *** main objective is determining a link between two possible evaporator configurations and the refrigerator’s *** two considered evaporators work at different pressure *** related time evolution profiles of temperature,pressure and water content are ***,the effects of hot water inlet temperature and cooling water inlet temperature on the specific cooling capacity(SCP)and coefficient of performance(COP)are predicted by means of numerical *** results show that an increase in the temperature of hot water and a decrease in the temperature of the cooling water allow an increase in COP and *** particular,for a hot water inlet temperature of 85°C and a cooling water inlet temperature of 40°C,the COP and Qev are 0.67 and 4.3 kW,respectively.

关键词： Adsorption chiller solar biomass performance

Numerical Simulation of a Granular Flow on a Smooth Inclined Plane

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1631-1638页

作者： Rida Tazi Adil Echchelh mohammed el ganaoui Aouatif Saad Laboratory of Materials and Energy Faculty of SciencesIbn Tofail UniversityKenitraMorocco LERMAB/IUT Longwy Institut CarnotNancyFrance ASelab Advanced Systems Engineering Laboratory National School of Applied SciencesIbn Tofail UniversityKenitraMorocco

Unlike most fluids,granular materials include coexisting solid,liquid or gaseous regions,which produce a rich variety of complex *** flows of grains driven by gravity down inclines occur in nature and in *** describe the granular flow on an inclined surface,several studies were carried *** can cite in particular the description of Saint-Venant which considers a dry granular flow,without cohesion and it only takes into account the substance-substrate friction,this model proposes a simplified form of the granular flow,which depends on the one side on the angle of inclination of the substrate with respect to the horizontal plane and on the other side on the thickness of the substance *** numerical simulation we have developed is first based on the Saint-Venant model,it allowed us to visualize the variation of the speed according to the thickness of the substance(from 0 to H)and to deduce the average speed of the substance on an inclined ***,this restrictive model does not take into account the effect of particle friction on the flow and considers that the thickness H is *** make our simulation more realistic,we opted for the Savage-Hatter *** took into account the variation of the thickness on the particles speed,in addition we have studied the effect of the variation of many parameters on the granular flow,namely the temperature and the roughness of the substrate,the density and the compactness of the substance,we found that the speed of the particles increases and the treatment time decreases with an increase in temperature.

关键词： Granular flow friction cohesion angle ofinclination temperature

Impact of the Inlet Flow Angle and Outlet Placement on the Indoor Air Quality

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Fluid Dynamics & Materials Processing 2024年第11期20卷 2603-2616页

作者： Ikram Mostefa Tounsi Mustapha Boussoufi Amina Sabeur mohammed el ganaoui Laboratoire des Sciences et Ingénierie Maritimes Facultéde Génie Mécanique.Universitédes Sciences et de la Technologie d’Oran Mohammed BoudiafBP 1505 El M’NaouerOran31000Algérie Laboratoire LERMAB IUT Longwy Universitéde LorraineNancy54000France

This study aims to optimize the influence of the inlet inclination angle on the Indoor Air Quality(IAQ),heat,and temperature distribution in mixed convection within a two-dimensional square cavityfilled with an air-CO_(2)*** air-CO_(2)mixture enters the cavity through two inlet openings positioned at the top wall,which is set at the ambient temperature(TC).Three values of the Reynolds numbers,ranging from 1000 to 2000,are considered,while the Prandtl number is kept constant(Pr=0.71).The temperature distribution and streamlines are shown for Rayleigh number(Ra)equal to 104,three inlet inclination anglesϕ(0,π/6 andπ/4)and three CO_(2)concentrations values(1500,2500,3500 ppm)applied at both hot vertical walls(maintained at a constant temperature TH).Afinite volume method is used under the assumption of two-dimensional laminarflow to solve the NavierStokes and energy *** results indicate that inlet inclination angle has an impact on the indoor air quality(IAQ),which,in turn,affects the heat transfer distribution and thermal comfort within the cavity.

关键词： Mixed convection air-CO_(2) mixture inlet inclination angles laminarflow indoor air quality

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 mohammed 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

Feasibility Study for a Hybrid Power Plant(PV-Wind-Diesel-Storage)Connected to the electricity Grid

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Fluid Dynamics & Materials Processing 2022年第6期18卷 1607-1617页

作者： Fahad Maoulida Kassim Mohamed Aboudou Djedjig Rabah mohammed el-ganaoui Laboratory LEMAFaculty of Sciences and TechniquesUniversity of ComorosMoroniComoros Laboratory LERMABIUT Henri Poincaréof LongwyUniversity of LorraineNancyFrance IREMIS Institute CUFRUniversity of MayotteDembeni MayotteFrance

In this work,we present a feasibility study for a new hybrid power plant(PV-Wind-Diesel-Storage)directly connected to the electrical *** simulations are performed to verify the performance of the hybrid system under different scenarios using real meteorological *** is shown that the performances of the hybrid system connected to the electrical network depend obviously on the available energy resources and constraints because the renewable energies are *** addition,the price of the kWh of electricity supplied by the hybrid system is determined,which amounts to$0.209/kWh,which is very cost effective and satisfactory for the considered sample conditions(Comoros Island).

关键词： Hybrid energy renewable energy HOMER connected grid

Experimental investigation of hygrothermal behavior of wooden-frame house under real climate conditions

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Energy and Built Environment 2023年第1期4卷 122-129页

作者： Mourad Rahim Rabah Djedjig Dongxia Wu Rachid Bennacer mohammed el ganaoui University of Lorraine LERMABIUT H Poincaréde Longwy168 Rue de LorraineCosnes et Romain54400 LongwyFrance University of Paris-Saclay ENS Paris-SaclayCNRSLMT91190 Gif-sur-YvetteFrance

This paper deals with the experimental investigation of hygrothermal behavior of wooden-frame building *** experiment was based on in-situ monitoring of a full size experimental monozone house built at the University of *** in temperature and relative humidity inside and outside the envelope were logged simultaneously with local meteorological *** showed the high coupling between temperature and relative humidity variations within the envelope *** overall hygrothermal response of the wall highlighted an interesting hygrothermal dynamic behavior of the envelope which may contribute to mitigate variations of relative humidity inside the ***,relative humidity evolves within a range of values that can lead to mold growth at a certain position which may alter wooden envelope life.

关键词： 3 hygrothermal behavior Heat and mass transfer Wood Bio-based building envelope

Simulation of the Hygrothermal Behavior of a Building Envelope Based on Phase Change Materials and a Bio-Based Concrete

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Fluid Dynamics & Materials Processing 2022年第5期18卷 1483-1494页

作者： Dongxia Wu Mourad Rahim Wendong Li mohammed el ganaoui Rachid Bennacer University of Lorraine LERMABIUT H Poincaréde LongwyLongwy54400France University of Paris-Saclay ENS Paris-SaclayCNRSLMTGif-sur-Yvette91190France

Phase Change Materials(PCMs)have high thermal inertia,and hemp concrete(HC),a bio-based concrete,has strong hygroscopic *** previous studies,PCM has been extensively combined with many materials,however,most of these studies focused on thermal properties while neglecting hygroscopic *** this study,the two materials have been combined into a building envelope and the related hygrothermal properties have been *** particular,numerical studies have been performed to investigate the temperature and relative humidity behavior inside the HC,and the effect of adding PCM on the hygrothermal behavior of the *** results show that there is a high coupling between temperature and relative humidity inside the HC,since the relative humidity changes on the second and third days are different,with values of 8%and 4%,***,the variation of relative humidity with temperature indicates the dominant influence of temperature on relative humidity *** the presence of PCM,the temperature variation inside the HC is damped due to the high thermal inertia of the PCM,which also leads to suppression of moisture evaporation and thus damping of relative humidity *** the second and third days,the temperature changes at the central position are reduced by 4.6%and 5.1%,compared to the quarter *** the relative humidity change,the reductions are 5.3%and 5.4%on the second and third days,***,PCM,with high thermal inertia,acts as a temperature damper and has the potential to increase the moisture buffering capacity inside the *** makes it possible for such a combined envelope to have both thermal and hygric inertia.

关键词： Phase change material(PCM) bio-based concrete passive building envelope heat and moisture transfer hygrothermal performance