Jamal-Eddine Salhi

Abdelmalek Essaâdi University | UAE

Machining of Nomex honeycomb composite (NHC) structures is of critical importance in manufacturing parts to the specifications required in the aerospace industry. However, the special characteristics of the Nomex honeycomb structure, including its composite nature and complex geometry, require a specific machining approach to avoid cutting defects...

Nomex honeycomb composite core (NHC) is characterized by thin walls and complex hexagonal cells, giving it specific characteristics. However, this particularity generates significant challenges during its shaping, requiring the use of cutting tools of the particular geometry. In this study, experimental tests were conducted on the milling of NHC st...

Nomex honeycomb composites (NHCs) are commonly used in various industrial sectors such as aerospace and automotive sectors due to their excellent material properties. However, when machining this type of structure, problems can arise due to significant cutting forces and unwanted cell vibrations. In order to remedy these shortcomings, this study pr...

The transition towards a 100 % renewable energy society has become imperative to mitigate the impacts of climate change and reduce CO 2 emissions. To attain this objective, the use of electric vehicles (EVs) is crucial, particularly considering that the transportation sector is a major contributor to pollution and energy consumption. However, for o...

This book deals with the evolution of a mechanical system from an initial state of equilibrium to a new state of equilibrium under the action of external loads. It focuses on homogeneous and isotropic systems with linear elastic behavior for small deformations. Prerequisites include concepts of classical linear elasticity. The chapters address theo...

Nomex honeycomb composite (NHC) cores have seen significant growth in recent years, particularly in the aeronautics, aerospace, naval and automotive industries. This development presents significant challenges in terms of improving machining quality, requiring the use of specialized cutting tools and favorable cutting techniques. In this context, e...

In this study, the thermal behaviour of insulating building walls and energy savings were determined in Er-Rachidia, located in southeast Morocco. Specifically, the study evaluates the effectiveness of clay-based insulation materials reinforced with palm leaves pinnate (PLP) and clay and palm trunk (PT). The results indicate that a 4 cm thick clay...

A wide range of studies treating the variation of solar cell performance is usually based on a simple approach that uses a uniform irradiation distribution. However, the flux arriving on the surfaces of solar cells is often not uniform, either because of obstacles (shading effect) or solar concentrators. In this paper, we will describe and study th...

In this paper, a thermal performance assessment of traditional building constructions and configurations in various Moroccan climates is carried out. This research focuses on enhancing conventional energy efficiency of buildings by investigating the thermal behavior of single clay walls, double clay walls, simple brick walls, and double brick walls...

This study looked at how steady-state three-dimensional turbulent forced convection flow and heat transfer worked in a circular pipe with baffles fixed inside the pipe. The numerical study was performed for a Reynolds number increasing from 100,000 to 140,000, a Prandtl number of 0.71, and a baffle angle of 90°. The findings demonstrate that the Nu...

The wastewater treatment procedure generally requires pumping stations to allow the supply pipe to pass the topographical constraints of the site. Since these pumping stations are characterized by high energy consumption, and in parallel with the energy transition of our country, and national strategies for the integration of renewable energy syste...

Solar air heating systems remain expensive, so we conducted a parametric analyzis to enhance their performance. The study focuses on a solar air heating system with a new proposed configuration including ribs with and without perforations. In the first step, we used a technique to vary the spacing (d) at 0.5, 0.3, 0.25, 0.2, 0.15, and 0.1 m for cas...

The manufacture of aluminum honeycomb structures is a major concern for companies in the aerospace industry, due to its out-of-plane high strength and stiffness-to-weight ratio. However, the shaping of this type of structure represents a technical challenge for engineers and researchers in terms of premature wear of the cutting tool and the quality...

Artificial roughness in the form of repeated ribs on a surface is an effective technique to improve the heat transfer rate. A numerical study on the heat transfer characteristics and flow structure of a fully developed turbulent flowing fluid in a rectangular duct having repeated transverse rib roughness. The thermo-hydrodynamic performance was obt...

Aluminum honeycomb structures have been frequently used in many industrial applications, especially in aerospace and aeronautics, due to their high strength and stiffness to weight ratio. The machining quality of aluminum honeycomb structures is generally related to plastic deformation of the walls forming the honeycomb structure and burrs. Consequ...

The manufacture of aluminum honeycomb structures is a major concern for companies in the aerospace industry, due to its high out-of-plane strength and stiffness-to-weight ratio. However, the shaping of this type of structure represents a technical challenge for engineers and researchers in terms of premature wear of the cutting tool and the quality...

The present study aims to investigate the effects of the presence of vortex generators in the cooling fluid flow of a microchannel heat sink and to seek to optimize its performance in terms of heat transfer. In addition, the cooling fluid used is a pure water solution in the presence of aluminum oxide (Al2O3) nanoparticles. The numerical simulation...

In this paper, the thermal performance improvements of a heat removal system like an electronic system have been analyzed. The studied case is a horizontal channel in which two partially inclined baffles are attached with variable height and number. The channel is crossed by a forced convective flow of a cooling fluid (air). This numerical work eva...

This paper performed a three-dimensional numerical analysis of the flow structure and heat transfer enhancement of turbulent airflow through a rectangular channel (without baffles, with baffles). Two partially inclined baffles with different orientations are mounted on the bottom and top walls of the channel. The location of the baffles in the dire...

he present study investigates numerically the heat transfer process based forced convective flow of an incompressible fluid in a two-dimensional rectangular channel. Two baffles are imposed periodically on the lower and upper walls. The study mainly focused on the influence of the arrangement and spacing separating the baffles on the heat transfer'...

The milling of aluminum honeycomb structures represents today an important scientific and technical research topic for many industrial applications: aerospace, aeronautic, automotive, and naval. The difficulties encountered when milling this type of materials are linked to the small thickness of the walls constituting the honeycomb cells and the du...

This paper presents an numerical simulation of the thermo-fluid characteristics for a heat exchanger with smooth concentric double tube equipped by Turbulators operating in the turbulent regime with Reynolds numbers from 3000 to 17,000. This heat exchanger is designed to provide a tubular heat energy exchange from a primary fluid (hot air) to a sec...

The machining of Nomex honeycomb structures represents a technical and scientific barrier for aeronautical applications. The difficulties encountered during the machining of this type of material are linked to the low density of Nomex paper, and to the low thickness of the walls forming the honeycomb cells of this type of structure. In this work, a...

The present study focused on researching a technique that can make a cooling system more efficient in terms of heat transfer. To achieve this, it is possible to modify the thermal conductivity of its cooling fluid or the structure of its flow. In this study, we have opted for the second technique. To do this, we sought to create singularities in th...

In machining, tool/workpiece interface parameters are complicated to estimate by experimental means alone. Numerical methods can then give critical solutions to predict and analyze the parameters influencing the machining. The friction between the tool and the cutter has a direct influence on the milling parameters. Therefore, it is necessary to un...

In the present study, a numerical study was carried out to study the impact of the cooling fluid’s thermophysical properties on the improvement of heat transfer in a cooling system. The chosen field of study is a channel of constant circular sections crossed by forced convective and turbulent flow. The wall being raised to a uniform and constant te...

The work undertaken in this paper presents a computational study of the flow and heat transfer characteristics in a tubular heat exchanger with longitudinal baffles attached to its inner wall, which is maintained at a constant temperature T w = 343 k. This study is carried out for a Reynolds number, Re ranging from 2 Â 10 4 to 3 Â 10 4 , and was de...

The technical constraints of the aeronautical and aerospace industry concerning the choice of materials are oriented, among other things, towards lightening structures and reducing consumption. There are many varieties of Nomex sandwich composites on the industrial market. The use of composite honeycomb core structures Nomex has further advanced th...

Nomex honeycomb structures are attracting increasing interest from many industrial sectors and their use is becoming more widespread. These structures are widely used in sandwich materials as lightweight structures having good mechanical properties. Due to its manufacture the machining of Nomex honeycomb structures present many technical and scient...

In this paper, we conducted a numerical study of three-dimensional laminar flow in forced convection, through a rectangular channel with two-perforation deflector fixed to its lower wall. To do so, the finite volume method based on the SIMPLE (Semi Implicit Method for Pressure Linked Equation) algorithm has been used to solve the Navier-Stokes, the...

In the present paper, we report a numerical study of dynamic and thermal behavior of the incompressible turbulent air flow by forced convection in a two-dimensional horizontal channel. This one contains the complicated form of the deflector which has been studied by varying the inclination angle from φ = 40°, φ = 55° to φ = 65°. The baffles are mou...