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Thermal Behavior of Clay-Based Building Materials: A Numerical Study Using Microstructural Modeling

Journal of Power and Energy Engineering 2022年第4期10卷 63-73页

作者： Ahmed Lkouen mohamed lamrani Ahmed Meskini Abdelhamid Khabbazi LM2I ENSEM Hassan II University Casablanca Morocco LGCEM EST Sale Mohamed V University Rabat Morocco EMDD_CERNE2D EST Sale Mohammed V University Rabat Morocco

A large part of the energy savings in the building sector comes from the choice of materials used and their structures. We are interested, through a numerical study, in establishing the link between the thermal performance of composite materials and their microstructures. The work begins with the generation of a two-phase 3D composite structure, the application of the Random Sequential Addition (RSA) algorithm, and then the finite element method (FE) is used to evaluate, in steady-state, the effective thermal conductivity of these composites. The result of the effective thermal conductivity of composite building material based on clay and olive waste at a volume fraction of 10% obtained by simulation is 0.573 W·m?1·K?1, this result differs by 3.6% from the value measured experimentally using modern metrology methods. The calculated value is also compared to those of existing analytical models in the literature. It can be noticed also that the effective thermal conductivity is not only related to the volume fraction of the inclusions but also to other parameters such as the shape of the inclusions and their distribution. The small difference between the numerical and experimental thermal conductivity results shows the performance of the code used and its validation for random heterogeneous materials. The homogenization technique remains a reliable way of evaluating the effective thermal properties of clay-based building materials and exploring new composite material designs.

关键词： Effective Thermal Conductivity Finite Element Calculation Homogenization RSA Composite

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Numerical Analysis of the Thermal Properties of Ecological Materials Based on Plaster and Clay

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Fluid Dynamics & Materials Processing 2023年第8期19卷 2013-2026页

作者： A.Lkouen M.lamrani A.Meskini A.Khabbazi Mechanics Engineering and Innovation Laboratory(LM2I)Higher School of Electricity and Mechanics(ENSEM)Hassan II UniversityCasablancaMorocco Civil Engineering and Environment Laboratory(LGCE) Higher School of Technology of Sale(EST-Sale)Mohamed V UniversityRabatMorocco Energy Materials and Sustainable Development(EMDD)WaterNatural ResourcesEnvironment and Sustainable Development Center(CERNE2D)Higher School of Technology of Sale(EST-Sale)Mohamed V UniversityRabatMorocco

Most of the energy savings in the building sector come from the choice of the materials used and their microphysical *** the present study,through numerical simulations a link is established between the thermal performance of composite materials and their ***,a two-phase 3D composite structure is modeled,then the RSA(Random Sequential Addition)algorithm and a finite element method(FE)are applied to evaluate the effective thermal conductivity of these composites in the *** particular,building composites based on gypsum and clay,consolidated with peanut shell additives and/or cork are *** numerically determined thermal conductivities are compared with values experimentally calculated using the typical tools of modern metrology,and with available analytical *** calculated thermal conductivities of the clay-based materials are 0.453 and 0.301 W.m^(−1).K^(−1) with peanut shells and cork,*** of the gypsum-based materials are 0.245 and 0.165 W.m^(−1).K^(−1) with peanut shells and cork,*** is shown that,in addition to its dependence on the volume fraction of inclusions,the effective thermal conductivity is also influenced by other parameters such as the shape of inclusions and their *** relative deviations,on average,do not exceed 6.8%,which provides evidence for the reliability of the used approach for random heterogeneous materials.

关键词： Effective thermal conductivity finite element calculation homogenization RSA composite

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Management of Isolated Coronal Fractures of Distal Humeral Epiphysis by Herbert Screw

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Open Journal of Orthopedics 2023年第2期13卷 50-54页

作者： Yassine Ben Bouzid Rida-Allah Bassir Monsef Boufettal Jalal Mekkaoui mohamed Kharmaz Moulay Omar lamrani mohamed Saleh Berrada Department of Orthopaedic and Traumatologic Surgery Ibn Sina University Hospital Rabat Morocco

Isolated fractures of the distal humerus are rare. Their diagnosis is often late, and treatment has progressed but serious complications may occur. We conducted a retrospective study of a series of 10 cases at the Department of Orthopedic and Traumatologic Surgery of the Ibn Sina University Hospital in Rabat over a 4-year period, from January 2018 to January 2022. All our cases were treated surgically with Herbert screws. The functional, clinical and radiological outcome was satisfactory with a return to pre-fracture activity in all patients.

关键词： Elbow Capitellum Herbert Screw

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