Bøger af Zied Driss

This book focuses on cases and studies of interest to mechanical engineers and industrial technicians. The considered applications in this volume are widely used in several industrial fields particularly in the automotive and aviation industries. Readers will understand the theory and techniques which are used in each application covered in each chapter. Volume 2 includes the following topics: -Numerical investigation of turbulent slot jets with various nanoparticle shapes -Experimental study on a sweeping gas membrane distillation unit -Development of design processes for multi-spindle drilling using a neural network and expert systems -Experimental investigation of a new hybrid solar collector (PV/t) system -Theoretical study of the effects of combustion duration on engine performance -Effects of preheating temperature and fuel-air equivalence ratio on pollution control in hydrocarbon combustion -Numerical study of natural convection between two concentric ellipses with different shapes and imposed temperatures -Theoretical study of the geometrical parameters effect on the behavior of a solar chimney power plant -Numerical investigations of the effect of packed bed porosity on the flow behavior -Comparison between a conventional and a four-stage Savonius wind rotor The presented case studies and development approaches aim to provide readers with basic and applied information broadly related to mechanical engineering and technology.

The study of centrifugal pumps is very useful in the mechanical engineering. 90% of industries use these pumps and it¿s a vital organ, therefore it¿s quite necessary to build a bigger knowledge in this domain, especially to know the way they work and how it¿s essential to develop experience in these machines. The main concern in the industry is the way of fixing pump¿s problems. Most of the pumps have common troubleshooting, especially bearings, impeller and coupling. So it¿s important to examine all aspects of pumps, in order to prevent damages that can occur and to have a straight line of production without taking a lot of time in maintenance.

In this Book, we are interested in studying of different solar radiations in each region of Arabic area. Also, we are interested to create an interface with Matlab Guide that is named Solar Radiations. This numerical interface includes five sections that the first section is the background of the interface. The three other sections are the studies sections on the solar radiations that are the monthly horizontal solar radiations, the hourly, daily and monthly solar radiations and the diffuse solar radiation models. In addition, the latest section is the application section on the photovoltaic technology. Moreover, the interface provides the studies of different solar radiations and also allows others techniques to estimate the variation of diffuse radiation using the isotropic and anisotropic methods and to evaluate the photovoltaic electrical source surfaces in each region of Arabic area. All of these studies provided by our interface take account the variation of the tilt angle ¿, the latitude ¿, the longitude L, the albedo ¿ and the Azimuth of slope.

This book focuses on cases and studies of interest to mechanical engineers and industrial technicians. The considered applications in this volume are widely used in several industrial fields particularly in the automotive and aviation industries. Readers will understand the theory and techniques which are used in each application covered in each chapter. The book contents include the following topics: Numerical analysis of hydrokinetic turbinesComputational fluid dynamics of a CuO based nanofluid in mini-channel cross-sectionsOrthodontic biomechanics of a NiTi arch wiresReynold's number effects on fluid flow through Savonius rotorsEffect of operating parameters on Zn-Mn alloys deposited from additive-free chloride bathOptical properties and stability of a blue-emitting phosphor (Sr2P2O7: Eu2+) Under UV and VUV excitationNumerical study of the influence of nanofluid type on thermal improvement in a three dimensional mini channelElectrochemical studies and characterization of Zn-Mn coatings deposited in the presence of novel organic additivesPrediction of fire and smoke propagation under a range of external conditions>The presented case studies and development approaches aim to provide the readers, such as graduate students, PhD candidates and professionals with basic and applied information broadly related to mechanical engineering and technology.

Wind tunnels are facilities in which the wind is produced by fans or by compressed air to study and measure the action of the air flow around a solid. There are two basic types of wind tunnels: the closed-circuit and the open-circuit. Open-circuits draw air from the ambient environment and exhaust it back to the ambient after exiting the fan, while in closed-circuit, the air repeatedly circulates through the tunnel. The closed-circuit design delivers improved efficiency and generates less noise, but it is more expensive and more difficult to manufacture. Wind tunnels are typically used in aerodynamic research to analyse the behaviour of flows under varying conditions, both within channels and over solid surfaces. The present book focus on uses and developments of wind tunnels. It consists on nine chapters presenting different studies on the design, uses and developments of the wind tunnel in different applications like wind turbines, building and aircraft models. The presented case studies and development approaches aim to provide the readers, such as engineers and PhD students, with basic and applied studies broadly related to the wind tunnels and its applications.