Download or read book Assessments of Bubble Dynamics Model and Influential Parameters in Microbubble Drag Reduction written by and published by . This book was released on 2006 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the course of this research effort computational parametric studies of the microbubble drag reduction phenomena were conducted. The effects of mixture density variation, free stream turbulence intensity, free stream velocity, and surface roughness on the microbubble drag reduction were studied using a single phase model based on Reynolds-averaged Navier-Stokes transport equations. Additionally, predictions of Eulerian multiphase model for microbubble laden flow were compared with Direct Numerical Simulation from the open literature. Good agreement was achieved between the simulations with the single phase model and experimental data of Deutsch et al. (2003). This good agreement was observed for both free stream velocity as well as surface roughness effect studies. Increased free stream turbulence intensity was observed to result in lower drag reduction, and this effect was stronger for higher density ratios of water and injected gas. For the same free stream velocity increase, the drag reduction was higher for higher density ratio. For fixed gas injection rate, lower drag reduction was predict for higher free stream velocity, and increased drag reduction was obtained with increased surface roughness. The drag reduction predicted by the multiphase model was substantially lower than that predicted by the Direct Numerical Simulation model of Ferrante and Elghobashi (2004). However, gas volume fraction and turbulent kinetic energy profiles predicted by the multiphase model were similar but not identical to those predicted by the DNS of Ferrante and Elghobashi (2004).
Download or read book Final Technical Report for Analytical Assessments Related to Microbubble Drag Reduction written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, the Hemispheric Center for Environmental Technology (HCET) at Florida International University conducted computational studies of the microbubble drag reduction mechanism. The objective of the research was to assess the roles of mixture density variation and surface roughness in microbubble drag reduction. The research was carried out in collaboration with the Applied Research Laboratory (ARL) at Pennsylvania State University, where substantial experimental research and theoretical understanding and modeling research have been conducted in this area. The principal work scope was carried out by HCET with ARL providing data and guidance and recommending models and analysis tools to support the research.
Download or read book Microbubble Drag Reduction Phenomenon Study in a Channel Flow written by Jose Alfredo Jimenez Bernal and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study on drag reduction by injection of microbubbles was performed in the upper wall of a rectangular channel at Re = 5128. Particle Image Velocimetry measurement technique (PIV) was used to obtain instantaneous velocity fields in the x-y plane. Microbubbles, with an average diameter of 30[mu]m, were produced by electrolysis using platinum wires with a diameter of 76 [mu]m. They were injected in the buffer layer producing several different values of local void fraction. A maximum drag reduction of 38.45% was attained with a local void fraction of 4.8 %. The pressure drop in the test station was measured by a reluctance pressure transducer. Several parameters such as velocity profile, turbulent intensities, skewness, flatness, joint probability density function (JPDF), enstrophy, one and two-dimensional energy spectra were evaluated. The results indicate that microbubbles reduced the intermittency of the streamwise fluctuating component in the region near the wall. At the same time they destroy or reduce the vortical structures regions (high shear zones) close to the wall. They also redistribute the energy among different eddy sizes. An energy shift from larger wavenumbers to lower wavenumbers is observed in the near wall region (buffer layer). However, outside this region, the opposite trend takes place. The JPDF results indicate that there is a decrease in the correlation between the streamwise and the normal fluctuating velocities, resulting in a reduction of the Reynolds stresses. The results of this study indicate that pursuing drag reduction by injection of microbubbles in the buffer layer could result in great saving of energy and money. The high wavenumber region of the one dimensional wavenumber spectra was evaluated from PIV spatial information, where the maximum wavenumber depends on the streamwise length (for streamwise wavenumber) of the recorded image and the minimum wavenumber depends on the distance between vectors. On the other hand, the low wavenumber region was calculated from the PIV temporal information by assuming Taylor's frozen hypothesis. This new approach allows obtaining the energy distribution of a wider wavenumber region.
Download or read book Vapor liquid Equilibrium Data Collection Aqueous organic systems written by Jürgen Gmehling and published by . This book was released on 1999 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ocean Atmosphere Interactions of Gases and Particles written by Peter S. Liss and published by Springer. This book was released on 2013-12-18 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: The oceans and atmosphere interact through various processes, including the transfer of momentum, heat, gases and particles. In this book leading international experts come together to provide a state-of-the-art account of these exchanges and their role in the Earth-system, with particular focus on gases and particles. Chapters in the book cover: i) the ocean-atmosphere exchange of short-lived trace gases; ii) mechanisms and models of interfacial exchange (including transfer velocity parameterisations); iii) ocean-atmosphere exchange of the greenhouse gases carbon dioxide, methane and nitrous oxide; iv) ocean atmosphere exchange of particles and v) current and future data collection and synthesis efforts. The scope of the book extends to the biogeochemical responses to emitted / deposited material and interactions and feedbacks in the wider Earth-system context. This work constitutes a highly detailed synthesis and reference; of interest to higher-level university students (Masters, PhD) and researchers in ocean-atmosphere interactions and related fields (Earth-system science, marine / atmospheric biogeochemistry / climate). Production of this book was supported and funded by the EU COST Action 735 and coordinated by the International SOLAS (Surface Ocean- Lower Atmosphere Study) project office.
Download or read book Nanotechnology Characterization Tools for Tissue Engineering and Medical Therapy written by Challa S.S.R. Kumar and published by Springer Nature. This book was released on 2019-11-22 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ninth volume of a 40 volume series on nanoscience and nanotechnology, edited by the renowned scientist Challa S.S.R. Kumar. This handbook gives a comprehensive overview about Nanotechnology Characterization Tools for Tissue Engineering and Medical Therapy. Modern applications and state-of-the-art techniques are covered and make this volume an essential reading for research scientists in academia and industry.
Download or read book Selected Problems in Fluid Flow and Heat Transfer written by Artur J. Jaworski and published by MDPI. This book was released on 2019-09-20 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid flow and heat transfer processes play an important role in many areas of science and engineering, from the planetary scale (e.g., influencing weather and climate) to the microscopic scales of enhancing heat transfer by the use of nanofluids; understood in the broadest possible sense, they also underpin the performance of many energy systems. This topical Special Issue of Energies is dedicated to the recent advances in this very broad field. This book will be of interest to readers not only in the fields of mechanical, aerospace, chemical, process and petroleum, energy, earth, civil ,and flow instrumentation engineering but, equally, biological and medical sciences, as well as physics and mathematics; that is, anywhere that “fluid flow and heat transfer” phenomena may play an important role or be a subject of worthy research pursuits.
Download or read book Design and Engineering of Microreactor and Smart Scaled Flow Processes written by Volker Hessel and published by MDPI. This book was released on 2018-10-08 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Design and Engineering of Microreactor and Smart-Scaled Flow Processes" that was published in Processes
Download or read book Natural Gas Seepage written by Giuseppe Etiope and published by Springer. This book was released on 2015-01-30 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book offers a modern, comprehensive, and holistic view of natural gas seepage, defined as the visible or invisible flow of gaseous hydrocarbons from subsurface sources to Earth’s surface. Beginning with definitions, classifications for onshore and offshore seepage, and fundamentals on gas migration mechanisms, the book reports the latest findings for the global distribution of gas seepage and describes detection methods. Seepage implications are discussed in relation to petroleum exploration, environmental impacts (hazards, pollution, atmospheric emissions, and past climate change), emerging scientific issues (abiotic gas and methane on Mars), and the role of seeps in ancient cultures. With an updated bibliography and an integrated analysis of available data, the book offers a new fundamental awareness - gas seepage is more widespread than previously thought and influences all of Earth’s external “spheres”, including the hydrosphere, atmosphere, biosphere, and anthroposphere.
Download or read book Shock Wave Boundary Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
Download or read book Flames Their Structure Radiation and Temperature written by Alfred Gordon Gaydon and published by . This book was released on 1979 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering in Medicine written by Paul A. Iaizzo and published by Academic Press. This book was released on 2018-11-07 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering in Medicine: Advances and Challenges documents the historical development, cutting-edge research and future perspectives on applying engineering technology to medical and healthcare challenges. The book has 22 chapters under 5 sections: cardiovascular engineering, neuroengineering, cellular and molecular bioengineering, medical and biological imaging, and medical devices.The challenges and future perspectives of engineering in medicine are discussed, with novel methodologies that have been implemented in innovative medical device development being described.This is an ideal general resource for biomedical engineering researchers at both universities and in industry as well as for undergraduate and graduate students. Presents a broad perspective on the state-of-the-art research in applying engineering technology to medical and healthcare challenges that cover cardiovascular engineering, neuroengineering, cellular and molecular bioengineering, medical and biological imaging, and medical devices Presents the challenges and future perspectives of engineering in medicine Written by members of the University of Minnesota’s prestigious Institute of Engineering in Medicine (IEM), in collaboration with other experts around the world
Download or read book Biological Flows written by Colin G. Caro and published by Springer. This book was released on 2013-12-19 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Biomechanics has a distinguished history extending at least to the 16th Century. However the later half oftbis century has seen an explosion ofthe field with it being viewed as affering exciting challenges for physical scientists and engineers interested in the life sciences, and wonderful opportunities for life scientists eager to collaborate with physical scientists and engineers and to render their scientific work more fundamental. That the field is now weil established and expanding is demonstrated by the formation of a World Committee for Biomechanics and the success and large participation in the 1st and 2nd World Congresses of Biomechanics, held respectively in San Diego in 1990 and in Amsterdam in 1994. With more than 1350 scientific papers delivered at the 2nd World Congress, either within symposia or oral or poster sessions, it would have been out of the question to try to produce comprehensive edited proceedings. Moreover, we are confident that most of the papers have been or will be published in one ofthe excellentjoumals covering the field. But of effort contributed by the plenary lecturers and the tutorial we thought that the large amount and keynote speakers of various symposia deserved tobe recognised in the form of a specific publication, thus also allowing those unable to attend the presentatiops . . tC\ sh?r~ in the findings. Furthermore, we feel that there is now a need to review aspects 'oftlie freld.
Download or read book Application Specific Integrated Circuit ASIC Technology written by Norman Einspruch and published by Academic Press. This book was released on 2012-12-02 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application Specific Integrated Circuit (ASIC) Technology explores and discusses the different aspects of the ASIC technology experienced during the 1990s. The topics of the chapters range from the ASIC business, model, marketing, and development up to its testability, packaging, and quality and reliability. An introductory chapter begins the discussion and tackles the historical perspective and the classification of the ASIC technology. Chapters 2 and 3 cover the business side of the technology as it discusses the market dynamics and marketing strategies. The following chapters focus on the product itself and deal with the design and model and library development. Computer-aided design tools and systems are included in the discussion. Manufacturing and packaging of ASICs are also given attention in the book. Finally, the last three chapters present the application, testability, and reliability of ASIC technology. The text can be of most help to students in the fields of microelectronics, computer technology, and engineering.
Download or read book Periodic Operation of Chemical Reactors written by P. L. Silveston and published by Butterworth-Heinemann. This book was released on 2012-12-04 with total page 793 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive review, prepared by 24 experts, many of whom are pioneers of the subject, brings together in one place over 40 years of research in this unique publication. This book will assist R & D specialists, research chemists, chemical engineers or process managers harnessing periodic operations to improve their process plant performance. Periodic Operation of Reactors covers process fundamentals, research equipment and methods and provides "the state of the art" for the periodic operation of many industrially important catalytic reactions. Emphasis is on experimental results, modeling and simulation. Combined reaction and separation are dealt with, including simulated moving bed chromatographic, pressure and temperature swing and circulating bed reactors. Thus, Periodic Operation of Reactors offers readers a single comprehensive source for the broad and diverse new subject. This exciting new publication is a "must have" for any professional working in chemical process research and development. A comprehensive reference on the fundamentals, development and applications of periodic operation Contributors and editors include the pioneers of the subject as well as the leading researchers in the field Covers both fundamentals and the state of the art for each operation scenario, and brings all types of periodic operation together in a single volume Discussion is focused on experimental results rather than theoretical ones; provides a rich source of experimental data, plus process models Accompanying website with modelling data
Download or read book Viscous Drag Reduction in Boundary Layers written by and published by AIAA. This book was released on 1990 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Signal Processing in Acoustics written by and published by Springer Science & Business Media. This book was released on 2008 with total page 1932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
