Luftens og væskers mekanik

Anvendt elektroteknik – forsyningsanlæg til elektriske installationer er en lærebog, der retter sig mod studerende, som ønsker at opnå kompetencer inden for højspændingsteknik. Bogen har særlig fokus på, at læseren får et overblik og kan se den systematik, der er fælles for transmissionsnettet og distributionsnettet. Anvendt elektroteknik – forsyningsanlæg til elektriske installationer gør sig fri af specifikke typer effektafbrydere og behandler mere generelle indstillinger. Bogen benytter impedansmetoden, der er en enkel metode og sikker nok til at foretage beregninger af kortslutningerne på 10 kV eller 20 kV niveau, samt på lavspændingsnettet. Bogen er målrettet de videregående tekniske uddannelser, især elinstallatøruddannelsen og maskinmesteruddannelsen, men kan også anvendes som håndbog af elrådgivere. Bogen er tillige rettet mod at opnå læringsmål svarende til el-autorisationsprøvens første opgave. Den er skrevet som et værktøj, der øger analyseniveauet hos de teknikere, elektrikere og el-ansvarligere, der arbejder med sikkerhed i elinstallationer, som er påvirket af højspændingsnettet.

This book comprises select peer-reviewed articles submitted for the proceedings of the International Conference on Mathematics and Computing (ICMC 2022), held by the School of Advanced Sciences, Vellore Institute of Technology, Vellore, India, in association with Ramanujan Mathematical Society, India, Cryptology Research Society of India and Society for Electronic Transactions and Security, India, from 6-8 January 2022. With an aim to identify the existing challenges in the areas of mathematics and computing, the book emphasizes the importance of establishing new methods and algorithms to address these challenges. The book includes topics on diverse applications of cryptology, network security, cyber security, block chain, IoT, mobile network, data analytics, applied algebra, mathematical analysis, mathematical modelling, fluid dynamics, fractional calculus, multi-optimization, integral equations, dynamical systems, numerical analysis and scientific computing. Divided into five major parts-applied algebra and analysis, fractional calculus and integral equations, mathematical modelling and fluid dynamics, numerical analysis, and computer science and applications-the book is a useful resource for students, researchers and faculty as well as practitioners.

The population balance methodology provides a powerful framework for studying polydisperse entities such as aerosols, crystals and bubbles. This self-contained and accessible book explains how this theoretical framework can be employed across a wide range of scientific, engineering and environmental problems. The methodology is explained step-by-step, showing readers how to use these techniques by formulating the population balance problem, choosing models and implementing appropriate solution methods. Particular focus is given to the coupling of the population balance with fluid mechanics and computational fluid dynamics (CFD), in both laminar and turbulent flows. Applications of the population balance methodology are explored in case studies including nanoparticle synthesis, soot formation and crystallisation, and sample open-source code is provided. This book will be valuable to researchers across a range of disciplines including chemical and mechanical engineering, physics and environmental science, and can be used as a resource for advanced undergraduate and graduate courses.

This book covers some of the fundamental topics in fluid power technology, presenting detailed derivations of formulas that form the basis of the theory. It shows the reader how to properly (i) design basic fluid power systems, (ii) construct lumped parameter models of simple fluid power systems, (iii) perform frequency analysis of fluid power components and systems, and (iv) develop controllers for fluid power systems. The book mainly focusses on mathematical modelling and analysis of fluid power components and systems i.e. practical issues such as working principles and construction of components are not covered in depth. The text is organized in four main parts: I Physics of Fluid, II Fluid Power Components, III Fluid Power Systems and IV Learning by Doing.

Energy and environmental sustainability have triggered a worldwide interest in the field of the transportation network and industrial activity. Friction consumes approximately one-fifth of the total energy utilized in machinery systems. One-third of all energy is spent only on overcoming friction. Tribology is the science of lubrication, friction, and wear deals with the prevention of wear and tear of surfaces that move relative to one another under load. The term tribology was initially coined by Jost in 1966. The term comes from the Greek word tribos, which means "to rub," or "the science dealing with the rubbing of surfaces." Therefore, Friction and wear can also be termed lubrication science. Tribological interactions consume around 23% of the world's total energy usage. About 20% is used to overcome friction whereas 3% is used to re-fix worn components and spare equipment that have failed due to wear and wear- related problems. Energy losses due to friction and wear can be decreased by 40% in the long term (15 years) and by 18% in the short term by utilizing new surfaces, materials, and lubrication technologies. Reduction in wear and friction can enhance the life period of automobiles, machines, and other equipment around the world. In the long run, these savings would be equal to 1.4 percent of global GDP and about 8.7% of overall energy use on a worldwide scale. Hence, a vast variety of innovative technological solutions for reducing friction and wear had been advised, yet have not been widely adopted. Efficient coolants and lubricants are required by rising energy needs, precision manufacturing, miniaturization, nuclear regulations, and critical economies. Considering the negative impacts of friction and wear, lubricants play a key role in reducing these negative impacts on tribological processes. Lubricants also reduce the temperature in tribomechanical systems and enhance the performance of the system. All types of maintenance incorporate lubrication as a critical component of the whole procedure. In mechanical systems, consistent performance and energy-saving are the foremost demand for an eco-friendly lubricant. The physio-chemical relations between the molecules of lubricant, material surfaces, and the environment causes lubrication in the system [

This volume gathers the latest advances, innovations, and applications in the field of wind engineering, as presented by leading international researchers and engineers at the XVII Conference of the Italian Association for Wind Engineering (IN-VENTO), held in Milan, Italy on September 4¿7, 2022. It covers highly diverse topics, including aeroelasticity, bluff-body aerodynamics, boundary layer wind tunnel testing, computational wind engineering, structural dynamics and reliability, wind-structure interaction, flow-induced vibrations, wind modeling and forecast, wind disaster mitigation, and wind climate assessment. The contributions, which were selected by means of a rigorous international peer-review process, highlight numerous exciting ideas that will spur novel research directions and foster multidisciplinary collaboration among different specialists.

This book provides a systematical investigation on the reservoir characteristics and percolation mechanism of ultradeep carbonate gas reservoirs, including reservoir characteristics and classification, gas storage and percolation capacities, gas-phase and gas-water two-phase percolation mechanism, microscale complex gas-water relationship, reservoir sensitivity characteristics, and gas production characteristics of heterogeneous carbonate reservoirs. Some advanced and improved experimental techniques and analytical methods are introduced and applied, including comprehensive evaluation technique of storage and percolation capacities, ultra-high temperature and pressure physical simulation experiment technique, microscopic visualization technique based on CT scanning and microelectronics lithography, and physical simulation technique for heterogeneous reservoir development. In addition, it summarizes strategies for the efficient development of ultradeep carbonate gas reservoirs based on these theoretical research results. The key techniques and methods introduced in this monograph satisfy the need for efficient development of ultradeep carbonate gas reservoirs and provide theoretical basis and methodological value for investigations on similar gas reservoirs. This book serves as a reference for engineering technical professionals, researchers, and graduate students who are engaged in the exploration and development of carbonate gas reservoirs.

This book presents improved numerical techniques and applied computer-aided simulations as a part of emerging trends in mechatronics in all areas related to complex fluids, with particular focus on using a combination of modeling, theory, and simulation to study systems that are complex due to the rheology of fluids (i.e., ceramic pastes, polymer solutions and melts, colloidal suspensions, emulsions, foams, micro-/nanofluids, etc.) and multiphysics phenomena in which the interactions of various effects (thermal, chemical, electric, magnetic, or mechanical) lead to complex dynamics. The areas of applications span materials processing, manufacturing, and biology.

This book offers a comprehensive collection of typical tasks from technical thermodynamics. It is ideal for preparing written and oral examinations at university. It contains 180 tasks that are solved in detail. Alternative solution strategies are often shown and discussed. The book is interesting for all engineering students who have to take an exam in thermodynamics. A problem-orientated approach is followed and a systematic method for solving the tasks is developed. Theoretical correlations and thermodynamic fundamentals are solved by means of concrete tasks. In addition to comprehension questions, the book contains numerous typical calculation problems. Here, too, the basics are summarised and solutions respectively solution strategies are discussed. These are conceived to provide students with strategies and tools to solve complex tasks. All these exercises should help to deepen the physical knowledge. The greater the technical competence, the more confidently one can face the exam! At best, the tasks will help you to have fun and enjoy thermodynamics! This book is a perfect complement to my textbook "Technical Thermodynamics for Engineers".

This volume gathers the latest advances, innovations and applications in the field of cable dynamics and aerodynamics, as presented by leading researchers and engineers at the 3rd International Symposium on Dynamics and Aerodynamics of Cables (ISDAC), held in Rome, Italy on June 15-17, 2023. The contributions encompass topics such as nonlinear cable dynamics, cable structures and moving cables, cable aging, fatigue, degradation and failure mechanisms, laboratory testing of cable dynamics and aerodynamics, computational models for cable dynamics and fluid-structure interaction, cable vibration control, cable driven parallel manipulators, monitoring of cable performance, environmental and anthropic loads on cable structures. The contributions, which were selected through a rigorous international peer-review process, share exciting ideas that will spur novel research directions and foster new multidisciplinary collaborations.

"Fluid Dynamics" is a comprehensive guide to the principles and applications of fluid dynamics in engineering and environmental science. It covers topics such as fluid statics, kinematics, conservation laws, boundary layer theory, pipe flow, open channel flow, and more. Packed with case studies, experimental techniques, and future directions, this book is an essential resource for anyone interested in the fascinating world of fluid dynamics.

This book presents a newly designed dynamic fluidic sprinkler (DFS) to improve hydraulic performance of the existing complete fluidic sprinkler (CFS) under low-pressure conditions. Sprinkler irrigation has high prospects for improving water management in crop production. In recent years, low-pressure water-saving has become an important research content in the field of sprinkler irrigation. It introduces the effect of riser height on rotation uniformity and application rate of the dynamic fluidic sprinkler. It also discusses the intelligent sprinkler irrigation technologies for autonomous and remote sensing system. This book will be a useful reference for researchers and professionals in the field of agriculture and irrigation.

These proceedings highlight the latest advances in fundamental research, technologies and applications of hydrogen energy and fuel cells. In recent years, energy conversion between electricity and hydrogen energy has attracted increasing attention as a way to adjust the load of the grid. These conference records discuss and exchange cutting-edge findings and technological developments in fields such as new proton exchange membrane electrolysers, new electrode materials and catalysts, renewable energy, off-grid/grid-connected water electrolysis for hydrogen production, key materials and components of fuel cells, high-temperature solid oxide water electrolysis, energy storage technologies and research, CO2 hydrogenation to methanol, nitrogen to ammonia and other applications with industrial potential.The main topics of the proceedings include:1) Policies and strategies for hydrogen energy and fuel cells;2) Advanced proton exchange membranes, electrodes and catalyst materials for water electrolysis;3) Advanced hydrogen compression, storage, transportation and distribution technologies;4) Safety and related standards;5) Manufacture and R&D of key materials and components of fuel cells and stack systems.

This book highlights the latest advances in fundamental research, technologies and applications of hydrogen energy and fuel cells. In recent years, energy conversion between electricity and hydrogen energy has attracted increasing attention as a way to adjust the load of the grid. This book discusses and exchanges cutting-edge findings and technological developments in fields such as new proton exchange membrane electrolyzers, new electrode materials and catalysts, renewable energy, off-grid/grid-connected water electrolysis for hydrogen production, key materials and components of fuel cells, high-temperature solid oxide water electrolysis, energy storage technologies and research, CO2 hydrogenation to methanol, nitrogen to ammonia and other applications with industrial potential. The main topics of the proceedings include: 1) Policies and strategies for hydrogen energy and fuel cells; 2) Advanced proton exchange membranes, electrodes and catalyst materials for water electrolysis; 3) Advanced hydrogen compression, storage, transportation and distribution technologies; 4) Safety and related standards; 5) Manufacture and R&D of key materials and components of fuel cells and stack systems.

This book presents a theoretical analysis of several problems in thermal and solutal convections in magneto-hydrodynamic (MHD) flows. It provides a systemic discussion on the development of fluid dynamics, continuum hypothesis, Newton¿s law of viscosity, heat transfer, mass transfer, thermal diffusion, diffusion-thermo-MHD, gray and non-gray gases, Fourier¿s law of conduction, and Fick¿s law of diffusion in such a way that readers with little knowledge in physics will find it easier to understand the contents. Some physical principles, such as those governing fluid motion, fluid temperature, and fluid concentration, are presented in vector form, allowing the corresponding form to be derived in any orthogonal curvilinear coordinate system. Laplace transform technique in closed form is used to obtain exact solutions to unsteady one-dimensional flow problems, an implicit finite difference method of Crank¿Nicholson type is used to solve unsteady two-dimensional flow problems, and an asymptotic series expansion method is used to solve the governing equations of the steady three-dimensional flow problem analytically. Flow and transport phenomena are thoroughly treated in each chapter separately. This book emphasizes the influence of an induced magnetic field. The outcomes of the works are graphically depicted so that readers can gain a tangible understanding of the problems. It also includes a list of inverse Laplace transforms (ILTs) for several specific functions, some of which are not found in the existing literature. The ILTs of special functions are given in brief form and can further be utilized as standard formulae in finding those as special cases. Some new special functions are introduced in the book, along with appropriate definitions. As a result, the formulations for velocity, temperature, concentration, skin friction, Nusselt number, and Sherwood number have been appeared in brief and convenient forms that are uncommon in other literature. This book addresses numerous areas of contemporary magneto-fluid dynamics research that have major implications in engineering. It is primarily intended for researchers working in the field of heat and mass transfer in hydromagnetic flows.

This textbook presents the classical topics of conduction heat transfer and extends the coverage to include chapters on perturbation methods, heat transfer in living tissue, numerical solutions using MATLAB®, and microscale conduction. This makes the book unique among the many published textbooks on conduction heat transfer. Other noteworthy features of the book are: The material is organized to provide students with the tools to model, analyze, and solve a wide range of engineering applications involving conduction heat transfer.Mathematical techniques and numerical solvers are explained in a clear and simplified fashion to be used as instruments in obtaining solutions.The simplicity of one-dimensional conduction is used to drill students in the role of boundary conditions and to explore a variety of physical conditions that are of practical interest.Examples are carefully selected to illustrate the application of principles andconstruction of solutions.Students are trained to follow a systematic problem-solving methodology with emphasis on thought process, logic, reasoning, and verification. Solutions to all examples and end-of-chapter problems follow an orderly problem-solving approach.An extensive solution manual for verifiable course instructors can be provided on request. Please send your request to heattextbook@gmail.com

Computational fluid dynamics (CFD) is a powerful tool that enables engineers and scientists to simulate fluid flows in a variety of applications, including thermal engineering, biomedical engineering, and environmental modeling. This book provides a comprehensive introduction to CFD, encompassing fundamental theory, mathematical and numerical techniques, and practical applications. The book begins by systematically introducing the basic concepts and terminology of CFD, such as the continuity equation, Navier-Stokes equations, energy equation, source/sink terms, and types of grids. The mathematical and numerical methods utilized to solve the CFD governing equations, including the finite difference method and the finite volume method, are then described in a beginner-friendly manner, accompanied by vivid and straightforward graphical illustrations. In addition to covering the foundation of CFD theory, the book presents several practical applications of CFD in diverse fields such as biomedical modeling, renewable energy, and thermal engineering. To extract useful information, the simulated CFD results need to be analyzed and visualized. Therefore, the book demonstrates common post-processing and visualization techniques, such as contour plots, streamlines, vectors, and charts. Overall, this book provides a comprehensive introduction to CFD, encompassing the essential theory, methods, and applications, making it an ideal choice as a textbook for graduate and post-graduate students or a reference for researchers and engineers working on CFD simulations.

This concise and rigorous textbook introduces students to continuum thermodynamics, combining a complete treatment of the subject with practical applications to material modelling. It presents mathematical prerequisites and the foundations of continuum mechanics, then introduces more advanced topics such as theories for the investigation of material models. Taking the student step-by-step through the subject, it allows full understanding of the theory and how it relates to real-world practical applications. Packed with examples and illustrations to describe complex concepts and mathematical derivations, and including end-of-chapter problems with helpful hints, this is the ideal, accessible introduction to continuum thermodynamics for senior undergraduate and graduate students in mechanical, aeronautical and civil engineering.

This book highlights the theories and research progress in gaseous detonation research, and proposes a universal framework theory that overcomes the current research limitations. Gaseous detonation is an extremely fast type of combustion that propagates at supersonic speed in premixed combustible gas. Being self-sustaining and self-organizing with the unique nature of pressure gaining, gaseous detonation and its gas dynamics has been an interdisciplinary frontier for decades. The research of detonation enjoyed its early success from the development of the CJ theory and ZND modeling, but phenomenon is far from being understood quantitatively, and the development of theories to predict the three-dimensional cellular structure remains a formidable task, being essentially a problem in high-speed compressible reacting flow. This theory proposed by the authors¿ research group breaks down the limitation of the one-dimensional steady flow hypothesis of the early theories, successfully correlating the propagation and initiation processes of gaseous detonation, and realizing the unified expression of the three-dimensional structure of cell detonation. The book and the proposed open framework is of high value for researchers in conventional applications such as coal mine explosions and chemical plant accidents, and state-of-the-art research fields such as supernova explosion, new aerospace propulsion engines, and detonation-driven hypersonic testing facilities. It is also a driving force for future research of detonation.

This Handbook of Numerical Simulation of In-Flight Icing covers an array of methodologies and technologies on numerical simulation of in-flight icing and its applications. Comprised of contributions from internationally recognized experts from the Americas, Asia, and the EU, this authoritative, self-contained reference includes best practices and specification data spanning the gamut of simulation tools available internationally that can be used to speed up the certification of aircraft and make them safer to fly into known icing. The collection features nine sections concentrating on aircraft, rotorcraft, jet engines, UAVs; ice protection systems, including hot-air, electrothermal, and others; sensors and probes, CFD in the aid of testing, flight simulators, and certification process acceleration methods. Incorporating perspectives from academia, commercial, government R&D, the book is ideal for a range of engineers and scientists concerned with in-flight icing applications.

This book provides a comprehensive yet concise knowledge and understanding in the field of Two-phase separation in the T-Junction. and this book can not only contribute to the academics, but it can also provide valuable insight for the industrial use of the T-junction.This book discusses in detail, the effect of different parameters on phase separation. These independent variables include diameter ratio, velocity ratio, individual phase velocities, side arm inclination, main arm inclination, mass split ratio, density of the working fluid, types of T-junctions used and modification in the T-Junction. The objectives and goals of this books are concerned with the research involved with the heat transfer applications, fluid mechanics and flow transmission in the petroleum field. Currently the data from the literature indicates that there is no specific source of consistent conclusion about the multiphase phenomenon. This book can provide a database of knowledge keeping in view of all the previous studies of the recent decades.So, engineers performing their duties in their respective sector, graduate and Ph.D students in the field of engineering can get valuable information about Two Phase Separation in the T-Junction.

This book comprehensively describes the operating principles and theoretical foundations of solar chimneys. It covers current research results, including numerical analysis and mathematical models based on different assumptions. Complying with the application of renewable energy in sustainable buildings, solar chimney has received extensive attention as an indispensable part natural ventilation. This book is a guide to the application of solar chimneys from single zones to multi zones, and it provides a reference source of application for construction practitioners and engineering decision-makers. The design basis and the related basic principles of fluid mechanics and natural ventilation design strategies introduced in this book will also be beneficial to college students.