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Author : Paul Salipante
Publisher :
ISBN 13 :
Total Pages : 160 pages
Book Rating : 4.:/5 (471 download)
Download or read book Electrohydrodynamics of Drops in Strong Fields written by Paul Salipante and published by . This book was released on 2009 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Debasish Das
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.:/5 (959 download)
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.
Author : Md. Abdul Halim
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.:/5 (885 download)
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
Author : Pengtao Yue
Publisher : MDPI
ISBN 13 : 3039282964
Total Pages : 142 pages
Book Rating : 4.0/5 (392 download)
Download or read book Drop, Bubble and Particle Dynamics in Complex Fluids written by Pengtao Yue and published by MDPI. This book was released on 2020-03-19 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of drops, bubbles, and particles affects the behavior and response of complex multiphase fluids. In many applications, these complex fluids have more than one non-Newtonian component, e.g., polymer melts, liquid crystals, and blood plasma. In fact, most fluids exhibit non-Newtonian behaviors, such as yield stress, viscoelastity, viscoplasticity, shear thinning, or shear thickening, under certain flow conditions. Even in the complex fluids composed of Newtonian components, the coupling between different components and the evolution of internal boundaries often lead to a complex rheology. Thus the dynamics of drops, bubbles, and particles in both Newtonian fluids and non-Newtonian fluids are crucial to the understanding of the macroscopic behavior of complex fluids. This Special Issue aims to gather a wide variety of papers that focus on drop, bubble and particle dynamics in complex fluids. Potential topics include, but are not limited to, drop deformation, rising drops, pair-wise drop interactions, drop migration in channel flows, and the interaction of particles with flow systems such as pastes and slurries, glasses, suspensions, and emulsions. We emphasize numerical simulations, but also welcome experimental and theoretical contributions.
Author : Osman Ali Basaran
Publisher :
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4.:/5 (319 download)
Download or read book Electrohydrodynamics of Drops and Bubbles written by Osman Ali Basaran and published by . This book was released on 1984 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Emmanuil G. Sinaiski
Publisher : John Wiley & Sons
ISBN 13 : 3527611398
Total Pages : 810 pages
Book Rating : 4.5/5 (276 download)
Download or read book Separation of Multiphase, Multicomponent Systems written by Emmanuil G. Sinaiski and published by John Wiley & Sons. This book was released on 2007-09-24 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly detailed reference represents an elaborate development of the theory of processing oil and natural gas and its application in the field -- indispensable for graduate engineering students and professionals alike. The renowned expert author, a professor at Moscow State University, has ample experience in both lecturing and publishing, albeit in the Russian language. This book is thus the first to provide a translation compiling his extensive knowledge, much of which remained unpublished due to security restrictions in the former Soviet Union. Based upon and compiled from Professor Sinaiski's university lectures, the first chapters treat the technical facilities for preparing and processing natural hydrocarbon substances. The following systematic approach go on to explain the behaviors of fluids, gases and droplets separately for solutions, suspensions and emulsions, as well as for gas-liquid mixtures. The resulting work is of interest both for senior students as well as for engineers working in this field.
Author : Marrivada Nanchara Reddy
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (311 download)
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
Author : Lei Fang
Publisher :
ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.:/5 (55 download)
Download or read book Electrohydrostatics of Pendant Drops in a D.C. Electric Field written by Lei Fang and published by . This book was released on 2001 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alejandro Agustin Carderera de Diego
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (1 download)
Download or read book Drop Electrohydrodynamics written by Alejandro Agustin Carderera de Diego and published by . This book was released on 2016 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrohydrodynamics is the study of the interaction between fluids and electric fields, and is used to model phenomena like fuel atomization or the mixing of multiphase flows under the influence of electric fields. Increasing interest is being placed in using electric fields to vary multiphase behaviour, one example is combustion processes, where finer droplets and wider sprays are created to increase engine efficiency. Another example can be seen in the pharmaceutical industry, where micro-encapsulation of compounds is achieved through the use of electrified coaxial liquid jets. In this work, the Ghost Fluid Method (GFM), and the Continuum Surface Force (CSF) approach will be used to discretize the electric potential Poisson equation for multiphase problems with arbitrary interfaces and discontinuous physical properties. A new scheme has also been derived to solve this problem, in the Finite Volume (FV) framework, and an extensive error analysis has been carried out to gauge the accuracy and properties of these schemes. These tools, coupled with NGA, the Computational Fluid Dynamics (CFD) code used in Dr. Olivier Desjardins' research group will allow the study of, among others, the two phase mixing of two dielectric liquids under the influence of an electric field, of interest to the chemical engineering industry, where an alternative non-mechanical way of mixing corrosive liquids is sought out, or the atomization of drops during fuel injection when an electric field is applied.
Author : Evan L. Ausman
Publisher :
ISBN 13 :
Total Pages : 106 pages
Book Rating : 4.:/5 (639 download)
Download or read book An Examination of the Effects of Strong Electric Fields on Supercooled Water Drops written by Evan L. Ausman and published by . This book was released on 1963 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Núria Romero Herreros
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Experimental Study of the Influence of an Electric Field on the Shape of a Droplet written by Núria Romero Herreros and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrowetting effect has emerged as an important research topic in recent years. Manipulation of droplets by electric fields has been extensively studied employing different setups, the most common being the configuration in which the electric field is created inside the droplet. However, such a configuration has been mostly employed using conductive liquids, whereas non-conductive droplets have been barely tested under the effect of an electric field using this setup. On the other hand, the influence of an electric field on the shape of a droplet has also been of considerable interest using an alternative configuration in which the electric field is applied between two electrodes with no contact with the drop – the Taylor cone configuration. However, the effects observed employing this last setup are rather different to those obtained using the aforementioned design. While the most important effect in those experiments in which the electric field is created inside the drop is the reduction of the contact angle, the main effect found using the second configuration is the droplet elongation in the electric field direction. In order to demonstrate if dielectric and almost perfectly wetting liquid droplets are affected in the same way as other fluids already tested, the effect of an electric field on the shape of an HFE-7500 droplet has been examined under two different experimental setups by means of interferometric techniques. For the setup where the internal electric field is created, no statistically relevant reduction was measured. Nevertheless, shape deviations have been found at a certain distance of the wire through which the electric field is applied. Moreover, the existence of such deviations depends strongly on the AC frequency. Regarding the second design, it should be mentioned that the initial parallel plate design was working correctly for water+salt droplets. However, no remarkable effects were observed applying strong electric fields of up to 10 kV/cm on HFE-7500 droplets. With the goal of increasing the field strength, two improvised configurations of a metal ring and a needle as a counter-electrodes have also been implemented. In these cases, a strong non-uniform electric field was created which did lead to shape changes of the droplets.
Author :
Publisher :
ISBN 13 :
Total Pages : 144 pages
Book Rating : 4.:/5 (611 download)
Download or read book Static and Dynamic Behavior of Liquid Drops in Electric Fields written by and published by . This book was released on 1965 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 260 pages
Book Rating : 4.F/5 ( download)
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:
Author : United States. Office of Space Science and Applications
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (31 download)
Download or read book Microgravity Science and Applications Program Tasks written by United States. Office of Space Science and Applications and published by . This book was released on 1991 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Igor A. Kaltashov
Publisher : John Wiley & Sons
ISBN 13 : 0471705160
Total Pages : 320 pages
Book Rating : 4.4/5 (717 download)
Download or read book Mass Spectrometry in Biophysics written by Igor A. Kaltashov and published by John Wiley & Sons. This book was released on 2005-05-06 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first systematic summary of biophysical mass spectrometrytechniques Recent advances in mass spectrometry (MS) have pushed the frontiersof analytical chemistry into the biophysical laboratory. As aresult, the biophysical community's acceptance of MS-based methods,used to study protein higher-order structure and dynamics, hasaccelerated the expansion of biophysical MS. Despite this growing trend, until now no single text has presentedthe full array of MS-based experimental techniques and strategiesfor biophysics. Mass Spectrometry in Biophysics expertly closesthis gap in the literature. Covering the theoretical background and technical aspects of eachmethod, this much-needed reference offers an unparalleled overviewof the current state of biophysical MS. Mass Spectrometry inBiophysics begins with a helpful discussion of general biophysicalconcepts and MS-related techniques. Subsequent chaptersaddress: * Modern spectrometric hardware * High-order structure and dynamics as probed by various MS-basedmethods * Techniques used to study structure and behavior of non-nativeprotein states that become populated under denaturingconditions * Kinetic aspects of protein folding and enzyme catalysis * MS-based methods used to extract quantitative information onprotein-ligand interactions * Relation of MS-based techniques to other experimental tools * Biomolecular properties in the gas phase Fully referenced and containing a helpful appendix on the physicsof electrospray mass spectrometry, Mass Spectrometry in Biophysicsalso offers a compelling look at the current challenges facingbiomolecular MS and the potential applications that will likelyshape its future.
Author :
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (317 download)
Download or read book Microgravity Science and Applications Program Tasks, 1990 Revision written by and published by . This book was released on 1991 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Antonio Castellanos
Publisher : Springer
ISBN 13 : 3709125227
Total Pages : 371 pages
Book Rating : 4.7/5 (91 download)
Download or read book Electrohydrodynamics written by Antonio Castellanos and published by Springer. This book was released on 2014-05-04 with total page 371 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this book is to provide, both the non-specialist and the specialist in EHD, with the ability to extract meaningful information from his/her experimental data and acquire a good physical understanding, by applying the ideas presented in this book. In addition to providing the scientific background, it is also intended to take the reader to the frontiers of research in this field, so they may go, without effort, into the specialized literature. This book may be considered as complementary to the excellent treatment of EHD made in the classical book "Continuum Electromechanics” by Melcher, in that care has been taken to avoid overlapping of the subjects. In case a topic is treated in both texts, the results presented in the book by Melcher serve as an introduction to the more advanced treatment presented in this book.
