Search results for: the-sixth-international-symposium-on-multiphase-flow-heat-mass-transfer-and-energy-conversion

Nanotechnology and Energy

Author : Kaufui V. Wong
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Nanotechnology is a vibrant research area and a growing industry. The properties of nanoparticles and nanofluids are different from those of macroparticles and macrofluids because the physical and chemical properties are very dissimilar when dimensions are at the nanometer range. The first successes in using nanofluids for cooling were achieved and commercialized for automobiles; hence, this subarea is rather profitable. Other nanotechnology research and developmental areas are cutting edge. The core scientific principles of all nanotechnology applications are based in physics, chemistry, and engineering. Nanotechnology is not taught in most programs of engineering yet, and this book on nanotechnology and energy includes a discussion of introducing nanotechnology to the curricula of engineering students. The book also introduces significant current research topics in nanoscience and nanotechnology. It is a textbook for advanced undergraduate- and graduate-level students of nanotechnology, as well as a useful reference book for researchers and professional engineers working in the fields of macromolecular science, nanotechnology, and chemistry, especially those with an interest in energy and the environment, and the automotive industry.

Computational Methods in Multiphase Flow VII

Author : C. A. Brebbia
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Multiphase flows are found in all areas of technology, at all length scales and flow regimes and can involve compressible or incompressible linear or nonlinear, fluids. However, although they are ubiquitous, multiphase flows continue to be one of the most challenging areas of computational mechanics, with numerous problems as yet unsolved. Advanced computational and experimental methods are often required to solve the equations that describe such complex problems. The many challenges that must be faced in solving them include modelling nonlinear fluids, modelling and tracking interfaces, dealing with multiple length scales, characterising phase structures, and treating drop break-up and coalescence. It is important to validate models, which calls for the use of expensive and difficult experimental techniques.This book presents contributions on the latest research in the techniques for solving multiphase flow problems, presented at the seventh in a biennial series of conferences on the subject that began in 2001. Featured topics include: Flow in porous media; Turbulent flow; Multiphase flow simulation; Image processing; Heat transfer; Atomization; Interface behaviour; Oil and gas applications; Experimental measurements; Energy applications; Biological flows; Micro and macro fluids; Compressible flows.

Prediction of multiphase flow and separation efficiency of industrial centrifuges by means of numerical simulation

Author : Xiana Romaní Fernández
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Coupled CFD DEM Modeling

Author : Hamid Reza Norouzi
File Size : 76.28 MB
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Discusses the CFD-DEM method of modeling which combines both the Discrete Element Method and Computational Fluid Dynamics to simulate fluid-particle interactions. Deals with both theoretical and practical concepts of CFD-DEM, its numerical implementation accompanied by a hands-on numerical code in FORTRAN Gives examples of industrial applications

Encyclopedia Of Two phase Heat Transfer And Flow I Fundamentals And Methods A 4 volume Set

Author : Thome John R
File Size : 63.84 MB
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The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopediaa of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat tranfser and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.

Energy and Sustainability

Author : C. A. Brebbia
File Size : 41.17 MB
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The way in which our society exists, operates and develops is strongly influenced by the way in which energy is produced and consumed. No process in industry can be performed without a sufficient supply of energy, and without industry there can be no production of commodities, on which the existence of modern society depends. Energy systems have evolved over a long period and more rapidly over the last two centuries, as a response to the requirements of industry and society, starting with the combustion of fuels and building up to the exploitation of nuclear energy and renewable resources. It is clear that the evolution of energy systems is a continuous process, which involves constant technological developments and innovation.This book publishes papers presented at the First International Conference on Energy and Sustainability. Featured topics include: Energy Management; Energy and the Environment; Energy Markets and Policy; Energy Efficiency; Energy and External Costs; Computer Modelling; Energy Resources Management; Nuclear Fuels; Rational Use of Energy; Solid Fuel Energy; Energy and Built Environment; Exergy and Ecology; Energy and Life Cycle Analysis; Education and Training; Energy Systems and Pollution Control; Energy and Climate Change; Renewable Energy Technologies; Energy Storage and Transportation; Energy Analysis of Industrial Processes; Exergy and Economics; Regulations and Policies and Hydrocarbon Exploration and Recovery.

Encyclopedia Of Two phase Heat Transfer And Flow Ii Special Topics And Applications A 4 volume Set

Author : Thome John R
File Size : 63.33 MB
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The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopedia of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat transfer and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.

Computational Methods and Experimental Measurements XIII

Author : C. A. Brebbia
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Containing papers presented at the Thirteenth International Conference in this well established series on (CMEM) Computational Methods and Experimental Measurements. These proceedings review state-of-the-art developments on the interaction between numerical methods and experimental measurements.Featured topics include: Computational and Experimental Methods; Experimental and Computaqional Analysis; Computer Interaction and Control of Experiments; Direct, Indirect and In-Situ Measurements; Particle Methods; Structural and Stress Analysis; Structural Dynamics; Dynamics and Vibrations; Electrical and Electromagnetic Applications; Biomedical Applications; Heat Transfer; Thermal Processes; Fluid Flow; Data Acquisition; Remediation and Processing and Industrial Applications.

Advanced Computational Methods in Heat Transfer IX

Author : Bengt Sundén
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Heat Transfer topics are commonly of a very complex nature. Often different mechanisms like heat conduction, convection, thermal radiation, and non-linear phenomena, such as temperature-dependent thermophysical properties, and phase changes occur simultaneously. New developments in numerical solution methods of partial differential equations and access to high-speed, efficient and cheap computers have led to dramatic advances during recent years. This book publishes papers from the Ninth International Conference on Advanced Computational Methods and Experimental Measurements in Heat and Mass Transfer, exploring new approaches to the numerical solutions of heat and mass transfer problems and their experimental measurement. Papers encompass a number of topics such as: Diffusion and Convection; Conduction; Natural and Forced Convection; Heat and Mass Transfer Interaction; Casting, Welding, Forging and other Processes; Heat Exchanges; Atmospheric Studies; Advances in Computational Methods; Modelling and Experiments; Micro and Nano Scale Heat and Mass Transfer; Energy Systems; Energy Balance Studies; Thermal Material Characterization; Applications in Biology; Applications in Ecological Buildings; Case Studies.

Transmission Fluctuation Correlation Spectrometry Characterization of Particle Suspensions and Flow Structures

Author : Xiaoai Guo
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When a beam of light falls upon a flowing particle suspension, the transmitted light intensity fluctuates temporally, depending on the beam diameter and the properties of particle systems. In this thesis a new approach called transmission fluctuation correlation spectrometry (TFCS), including the autocorrelation technique (TFS-AC) and spatial correlation technique (TFS-SC), has been developed in detail and applied to characterize the flowing particle suspensions and flow structures. In view of the concentration effects of hard-core spherical particles in the suspension, a direct correlation function (DCF) of two-dimensional hard sphere fluids was proposed and applied to investigate the transmission fluctuations of radiation through a dense suspension by the TFCS technique. Based on the layer model, a general analytical expression of the expectancy of the transmission product (ETP) was presented under the assumptions of geometrical ray propagation and hard spherical particles in the suspension. Obtained transition spectrum can be applied to extract the particle size distribution (PSD) and particle concentration simultaneously. Furthermore, we extended the theory to the case of crossed beams as well as to the case of partially transparent particles with penetrating radiation. Compared with the expectancy of the transmission square (ETS) in the previous work, the transition function of the ETP in the present work is steeper and hence provides a higher resolution for particle size analysis. Numerical simulations indicate that the transmission fluctuation correlation spectrum is mainly affected by the monolayer structure and significant influences from particle shielding do not exist as long as the beam diameter is much smaller than the particle size. This offers an advantage when doing particle size analysis in dense suspensions. Firstly, the relationship among the particle size, concentration and transmission fluctuations has been investigated experimentally by use of a narrow focussed Gaussian beam, which makes the measurement setup simple. The deviation of extinction or turbidity from Bouguer-Lambert-Beer’s law (BLBL) in concentrated particle suspensions has been corrected with three various approaches including Riebel’s steric particle-particle interaction model, Vereshchagin’s shielding effect approximation and polynomial fit of particle concentration. Experimental results indicated that these three various approaches gave an almost equivalent prediction of extinction or turbidity over a wide range of particle volume concentrations up to about 20% for large particles, though their expressions are different in form. In the limit of low particle concentration, these approaches are equivalent to the BLBL. Secondly, measurements of flowing particle suspensions have been carried out by the TFCS technique. Spatial correlation was realized by changing the distance between dual beams and its advantage is that additional measurement of the flow velocity is unnecessary and hence the measurement is not strongly influenced by the flow conditions. Autocorrelation was realized by varying the autocorrelation time using a single narrow beam, which simplifies the optical arrangement. Two iterative inversion algorithms, i.e., modified Chahine inversion algorithm and relaxation method, were studied and tested with noisy numerical data and experimental data. They proved to be accurate, convergent, stable and suitable to retrieve the information on the PSD and particle concentration from the TFCS data. In this work, the experiments cover a particle size range from 8µm to 3.67mm and a wide dynamic range of particle volume concentration up to about 20% for large particles. It is worth pointing out that the lower and upper limits of the particle size range depend on the beam diameter and the optical path length, respectively. A decrease in the dimensionless optical path length can improve the upper limit of particle volume concentration. Finally, by means of the TFCS technique in combination with the LDV technique, experiments were carried out to investigate the characteristics of the vortex flow structures formed with small particles in the flowing water behind a bluff body. Flow visualization allowed observation of the phenomena at consecutive phases of the vortex shedding by adding small polyester glitter particles to the fluid. The velocity fluctuations associated with vortex shedding were studied by the LDV technique. By Fourier transform of the autocorrelation function of the velocity fluctuations, a power spectrum was obtained and its main spectral line gave vortex shedding frequency. Measurements of the vortex shedding frequency at different positions in the downstream wake of the triangular or circular bluff bodies were performed respectively. It is found that the measured vortex shedding frequency is almost linear with Reynolds number and consistent with the results obtained from Roshko’s proposal. As a comparative study, measurements were also carried out in the case of the pulsating flow. Experimental evidences indicate that vortex shedding frequency is disturbed by the pulsation frequency of the fluid. Especially under the most serious conditions, the flow pulsation frequency almost completely obscures the vortex shedding frequency, independent of the measurement positions. Furthermore, the seed particle size, concentration, and local flow structure dimension were measured by the TFCS technique. For comparison, numerical simulations of the vortex flow structures were used as a basis to simulate transmission fluctuation signals and to realize the TFCS measurements. It is found that the 3D experiments are in a qualitative good agreement with the 2D simulations. Therefore, the TFCS technique is very interesting for on-line and in-site applications.