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Fundamental Studies On The Dynamics Of Drops In Electric Fields
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Book Synopsis Fundamental Studies on the Dynamics of Drops in Electric Fields by : Marrivada Nanchara Reddy
Download or read book Fundamental Studies on the Dynamics of Drops in Electric Fields written by Marrivada Nanchara Reddy and published by . This book was released on 2008 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Management of bubbles/drops, and solid particles is a major task in many industrial processes. For almost all conventional applications, the gravitational force is predominantly used to control and manipulate their motion. In the cases where the gravitational force can no longer serve the purpose, particle control by electric field is a promising alternative. Thus, the electrohydrodynamic phenomenon, which deals with the interaction of fluid flow and electric field, is being studied in many physical, chemical, and engineering disciplines. Some of the prominent applications are microelectromechanical devices, enhancement of heat and mass transfer, and electroseparation devices (electrophoresis units, electrodialysis cells, and electrically driven desalters). In this thesis, the dynamics of drops suspended in an electric field were studied using Direct Numerical Simulations (DNS). The Navier-Stokes equation and the electrostatic equation were solved for the fluid inside and outside the drop. Several sets of simulations were performed concerning the dynamics of a single drop. The single bubble simulations captured the transient behavior of the drop, flow, and the electric field toward the steady state. Low surface tension drops readily deformed to oblate or prolate shapes while drops having high surface tension remained circular or went through rebound before reaching a steady state. The multibubble simulations showed the significance of the relative magnitude of the conductivity ratio (R) and the permittivity ratio (S), of the fluid drop to the ambient fluid, in the microstructure formation of the drops. When S > R , the drops tended to deform to oblate shapes and accumulate in the middle of the domain. For S
Book Synopsis Droplet Dynamics Under Extreme Ambient Conditions by : Kathrin Schulte
Download or read book Droplet Dynamics Under Extreme Ambient Conditions written by Kathrin Schulte and published by Springer Nature. This book was released on 2022 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book presents the main results of the Collaborative Research Center SFB-TRR 75, which spanned the period from 2010 to 2022. Scientists from a variety of disciplines, ranging from thermodynamics, fluid mechanics, and electrical engineering to chemistry, mathematics, computer science, and visualization, worked together toward the overarching goal of SFB-TRR 75, to gain a deep physical understanding of fundamental droplet processes, especially those that occur under extreme ambient conditions. These are, for example, near critical thermodynamic conditions, processes at very low temperatures, under the influence of strong electric fields, or in situations with extreme gradients of boundary conditions. The fundamental understanding is a prerequisite for the prediction and optimisation of engineering systems with droplets and sprays, as well as for the prediction of droplet-related phenomena in nature. The book includes results from experimental investigations as well as new analytical and numerical descriptions on different spatial and temporal scales. The contents of the book have been organised according to methodological fundamentals, phenomena associated with free single drops, drop clusters and sprays, and drop and spray phenomena involving wall interactions.
Book Synopsis Fundamental Studies of Fluid Mechanics by :
Download or read book Fundamental Studies of Fluid Mechanics written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We summarize our research results in three main areas: coating flows; electrohydrodynamics of drops; and wetting and spreading of drops. Experimental, computational and analytical methods are used to address a variety of issues. Coating flow studies include the effect of roughness, surfactants, and adsorbed particles on the dynamics of dip-coating. Electrohydrodynamic studies include drop deformation in uniform electric fields, shape distortion due to charge convection in sedimenting drops, and driving chaotic advection by either an electric field inclined to the direction of drop motion or time-periodic changes in the direction of the electric field. Heat and mass transport from chaotically mixed droplets exhibit unexpected and remarkable increases in the rates of transport. Finally, we develop an analytical solution to the problem of a static droplet, and use numerical techniques to predict its migration due to surface tension gradients.
Book Synopsis Electrohydrodynamics of Particles and Drops in Strong Electric Fields by : Debasish Das
Download or read book Electrohydrodynamics of Particles and Drops in Strong Electric Fields written by Debasish Das and published by . This book was released on 2016 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamics of dielectric rigid particles and liquid drops suspended in another liquid medium and subject to a uniform DC electric field, the study of which forms the field of electrohydrodynamics (EHD), has fascinated scientists for decades. This phenomena is described by the much celebrated Melcher-Taylor leaky dielectric model. The model hypothesises development of interfacial charge on the application of an electric field and prescribes a balance between transient charge, jump in normal Ohmic currents due to finite conductivities of the medium and charge convection arising from interfacial velocity. While there have been numerous studies on the dynamics of particles and drops more conducting than the surrounding liquid medium, weakly conducting particles and drops in strong electric fields, known to undergo symmetry-breaking bifurcations leading to steady rotation known as Quincke electrorotation has received much less attention. Recent experiments have reported a decrease in the effective viscosity of particle under Quincke rotation, thereby providing a means to tune the rheological properties of these suspensions. However, existing models based on an isolated particle, valid for dilute suspension, have been shown to be inaccurate as the density of particles increases. Motivated to resolve these discrepancies, we develop a theoretical model to account for electrohydrodynamic interactions between a pair of spherical particles. We then turn our attention to many particles free to roll on an electrode due to Quincke rotation. Using numerical simulations, we show that electrohydrodynamic interactions between particles give rise to collective motion of these colloidal suspensions. We find emergence of a polar liquid state with large vortical structure in circular confinement. Finally, we address the problem of electrohydrodynamics of deformable liquid drops, first studied by Taylor in 1966. We develop a transient small deformation theory for axisymmetric drops while including the nonlinear charge convection term neglected by previous researchers. We also use numerical simulations based on a novel three-dimensional boundary element method to capture large deformations. These simulations are the first to capture Quincke rotation due to inclusion of the nonlinear charge convection term and show excellent agreement with existing experimental data and theoretical predictions in the small deformation regime.
Book Synopsis Fundamentals of Low Gravity Fluid Dynamics and Heat Transfer by : Basil N. Antar
Download or read book Fundamentals of Low Gravity Fluid Dynamics and Heat Transfer written by Basil N. Antar and published by CRC Press. This book was released on 2019-07-23 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the fundamentals of low gravity fluid dynamics and heat transfer. It investigates fluid behavior in low gravity environments such as those found in earth orbiting and space vehicles. The two major fluid phenomena affected by gravity (buoyancy and surface tension) are treated thoroughly from both the theoretical and applications points of view, and limitations of fluid and thermal responses to gravitational fields in space-based settings are clearly delineated. Summaries of all data available from low gravity flight and terrestrial experiments performed to date are also presented.
Book Synopsis Computational Studies of Electrohydrodynamics of Liquid Drops in Ac Electric Fields by : Md. Abdul Halim
Download or read book Computational Studies of Electrohydrodynamics of Liquid Drops in Ac Electric Fields written by Md. Abdul Halim and published by . This book was released on 2013 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Management of bubbles, drops, and solid particles is a major task in many industrial processes. For almost all conventional applications, the gravitational force is predominantly used to control and manipulate their motion. In the cases where the gravitational force can no longer serve the purpose, particle control by electric field is a promising alternative. Thus, the electrohydrodynamic phenomenon, which deals with the interaction of fluid flow and electric field, is being studied in many physical, chemical, and engineering disciplines. Some of the prominent applications are microelectromechanical devices, enhancement of heat and mass transfer, and electroseparation devices (electrophoresis units, electrodialysis cells, and electrically driven desalters). In this thesis, the dynamics of drops suspended in AC electric fields were studied using Direct Numerical Simulations (DNS). The Navier-Stokes equation and the electrostatic equation were solved for the fluid inside and outside the drop. Several sets of simulations were performed concerning the dynamics of a single drop. The single bubble simulations captured the transient behavior of the drop, flow, and the electric field toward the quasi-steady state. Low surface tension drops readily deformed to oblate or prolate shapes while drops having high surface tension remained circular or went through rebound before reaching a quasi-steady state. The multibubble simulations showed the significance of the relative magnitude of the conductivity ratio (R) and the permittivity ratio (S), of the fluid drop to the ambient fluid, in the microstructure formation of the drops. When S>R, the drops tended to deform to oblate shapes and accumulate in the middle of the domain. For S The multibubble simulations showed the significance of the relative magnitude of the conductivity ratio (R) and the permittivity ratio (S), of the fluid drop to the ambient fluid, in the microstructure formation of the drops. When S>R, the drops tended to deform to oblate shapes and accumulate in the middle of the domain. For S
Book Synopsis Students’ Understanding of Research Methodology in the Context of Dynamics of Scientific Progress by : Mansoor Niaz
Download or read book Students’ Understanding of Research Methodology in the Context of Dynamics of Scientific Progress written by Mansoor Niaz and published by Springer. This book was released on 2016-04-20 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses how to improve high school students’ understanding of research methodology based on alternative interpretations of data, role of controversies, creativity and the scientific method, in the context of the oil drop experiment. These aspects form an important part of the nature of science (NOS). The study reported in this volume is is based on a reflective, explicit and activity-based approach to teaching nature of science (NOS) that can facilitate high school students’ understanding of how scientists elaborate theoretical frameworks, design experiments, report data that leads to controversies and finally with the collaboration of the scientific community a consensus is reached. Most students changed their perspective and drew concept maps in which they emphasized the creative, accumulative, controversial nature of science and the scientific method.
Book Synopsis Mass Spectrometry in Grape and Wine Chemistry by : Riccardo Flamini
Download or read book Mass Spectrometry in Grape and Wine Chemistry written by Riccardo Flamini and published by John Wiley & Sons. This book was released on 2009-12-23 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise, up-to-date overview of the applications of mass spectrometry To be able to estimate the potentiality of grapes and how it may be transferred into wine is key to grasping enological chemistry. Nowadays, mass spectrometry is a crucial aspect in ensuring the production, the quality, and the safety of grape, wine, and grape derivative products. Mass Spectrometry in Grape and Wine Chemistry examines in depth the relationship between the high structural identification power of mass spectrometry techniques and the chemistry of grapes and wine. The text is divided into two parts. The first section provides an overview of mass spectrometry methods in relation to enology in three chapters. The second section offers seven chapters on wine chemistry as well as traditional topics and new developments in mass spectrometry. Mass Spectrometry in Grape and Wine Chemistry explores many mass spectrometry applications, including: Ionization methods Mass analyzers and mass measurements Mass spectrometry methodologies Grape aroma compounds Volatile and aroma compounds in wines Grape and wine polyphenols Compounds released by wood into wine Wine defects caused by compounds Pesticide detection analysis Peptides and proteins of grape and wine Written by leading experts in the field, this book presents an introduction to mass spectrometry and outlines ways to maximize quality control and product safety for the best results. Mass Spectrometry in Grape and Wine Chemistry is an essential handbook for laboratories working in enology.
Book Synopsis The Giant Vesicle Book by : Rumiana Dimova
Download or read book The Giant Vesicle Book written by Rumiana Dimova and published by CRC Press. This book was released on 2019-11-19 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Giant vesicles are widely used as a model membrane system, both for basic biological systems and for their promising applications in the development of smart materials and cell mimetics, as well as in driving new technologies in synthetic biology and for the cosmetics and pharmaceutical industry. The reader is guided to use giant vesicles, from the formation of simple membrane platforms to advanced membrane and cell system models. It also includes fundamentals for understanding lipid or polymer membrane structure, properties and behavior. Every chapter includes ideas for further applications and discussions on the implications of the observed phenomena towards understanding membrane-related processes. The Giant Vesicle Book is meant to be a road companion, a trusted guide for those making their first steps in this field as well as a source of information required by experts. Key Features • A complete summary of the field, covering fundamental concepts, practical methods, core theory, and the most promising applications • A start-up package of theoretical and experimental information for newcomers in the field • Extensive protocols for establishing the required preparations and assays • Tips and instructions for carefully performing and interpreting measurements with giant vesicles or for observing them, including pitfalls • Approaches developed for investigating giant vesicles as well as brief overviews of previous studies implementing the described techniques • Handy tables with data and structures for ready reference
Book Synopsis Second Microgravity Fluid Physics Conference by :
Download or read book Second Microgravity Fluid Physics Conference written by and published by . This book was released on 1994 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrostatics 1999, Proceedings of the 10th INT Conference, Cambridge, UK, 28-31 March 1999 by : D.M. Taylor
Download or read book Electrostatics 1999, Proceedings of the 10th INT Conference, Cambridge, UK, 28-31 March 1999 written by D.M. Taylor and published by CRC Press. This book was released on 1999-01-01 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrostatics 1999: Proceedings of the 10th INT Conference, Cambridge, UK, 28-31 March 1999 provides an overview of recent research in electrostatics and an insight into the multifarious applications for electrostatics in industry. This comprehensive reference is ideal for researchers in physics, chemistry, and engineering who work in electrostati
Book Synopsis The Earth’s Electric Field by : Michael C. Kelley
Download or read book The Earth’s Electric Field written by Michael C. Kelley and published by Newnes. This book was released on 2013-09-21 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Earth’s Electric Field provides you with an integrated and comprehensive picture of the generation of the terrestrial electric fields, their dynamics and how they couple/propagate through the medium. The Earth’s Electric Field provides basic principles of terrestrial electric field related topics, but also a critical summary of electric field related observations and their significance to the various related phenomena in the atmosphere. For the first time, Kelley brings together information on this topic in a coherent way, making it easy to gain a broad overview of the critical processes in an efficient way. If you conduct research in atmospheric science, physics, atmospheric chemistry, space plasma physics, and solar terrestrial physics, you will find this book to be essential reading. The only book on the physics of terrestrial electric fields and their generation mechanisms, propagation and dynamics–making it essential reading for scientists conducting research in upper atmospheric, ionospheric, magnetospheric and space weather Covers the processes related to electric field generation and electric field coupling in the upper atmosphere along with providing new insights about electric fields generated by sources from sun to mud Focuses on real-world implications—covering topics such as space weather, earthquakes, the effect on power grids, and the effect on GPS and communication devices
Author :Arash Bateni Publisher :Library and Archives Canada = Bibliothèque et Archives Canada ISBN 13 :9780494028384 Total Pages :480 pages Book Rating :4.0/5 (283 download)
Book Synopsis Development of New Methodologies for the Study of Surface Tension and Contact Angle of Drops in an Electric Field [microform] by : Arash Bateni
Download or read book Development of New Methodologies for the Study of Surface Tension and Contact Angle of Drops in an Electric Field [microform] written by Arash Bateni and published by Library and Archives Canada = Bibliothèque et Archives Canada. This book was released on 2005 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the influence of an electric field on surface properties of liquids is of importance from both fundamental and practical standpoints. Charged or electrified drops currently play a key role in various applications, ranging from microfluidic devices to agricultural treatments. Nevertheless, the effects of the electric field on surface properties of drops are not understood yet, mainly due to the lack of reliable tools and methodologies to measure such effects.In this research, novel methodologies are developed that allow study of shape, surface tension, and contact angle of drops in the electric field: Automated Polynomial Fitting (APF) is a high-accuracy technique to determine contact angle of drops. It is applicable quite universally, and hence can be employed to measure the effect of the electric field on contact angles. Axisymmetric Drop Shape Analysis-Electric Fields (ADSA-EF) is a sophisticated drop-shape shape technique developed to study surface tension of drops in the electric field. ADSA-EF can also measure surface tensions in the absence of gravity; hence it is an ideal tool for microgravity research. Axisymmetric Liquid Fluid Interface-Electric Fields (ALFI-EF) is a side product of this research that can predict and simulate drop shapes in the electric field.In addition, two sets of ADSA-EF experiments were conducted in reduced-gravity using facilities provided by the Canadian Space Agency (CSA). In general, the measurements in the reduced-gravity condition agreed well with the previous ground-based measurements. The results suggested that gravity has no significant influence on the surface tension, as expected.Extensive experimental work was performed using the new methodologies. The correlation between thermodynamic contact angles and the electric field was determined for the first time, using APF. It was found that contact angle of polar liquids increases in the electric field (depending on the size of the molecules), whereas non-polar liquids remain unaffected by the field. The observations were interpreted in terms of liquid interfacial tensions, using thermodynamic relations. ADSA-EF experiments showed similar increase in liquid surface tensions; furthermore, they revealed a second-order correlation between the surface tension of conducting liquids and the electric field.
Book Synopsis IAS'93 by : IEEE Industry Applications Society. Meeting
Download or read book IAS'93 written by IEEE Industry Applications Society. Meeting and published by . This book was released on 1993 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1992 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electrification of Particulates in Industrial and Natural Multiphase flows by : Zhaolin Gu
Download or read book Electrification of Particulates in Industrial and Natural Multiphase flows written by Zhaolin Gu and published by Springer. This book was released on 2017-07-26 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces comprehensive fundamentals, numerical simulations and experimental methods of electrification of particulates entrained multiphase flows. The electrifications of two particulate forms, liquid droplets and solid particles, are firstly described together. Liquid droplets can be charged under preset or associated electric fields, while solid particles can be charged through contact. Different charging ways in gas (liquid)-liquid or gas-solid multiphase flows are summarized, including ones that are beneficial to industrial processes, such as electrostatic precipitation, electrostatic spraying, and electrostatic separation, etc., ones harmful for shipping and powder industry, and ones occurring in natural phenomenon, such as wind-blown sand and thunderstorm. This book offers theoretical references to the control and utilization of the charging or charged particulates in multiphase flows as well.
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