Computational Studies Of Electrohydrodynamics Of Liquid Drops In Ac Electric Fields
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Computational Studies Of Electrohydrodynamics Of Liquid Drops In Ac Electric Fields
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Author : Md. Abdul Halim
language : en
Publisher:
Release Date : 2013
Computational Studies Of Electrohydrodynamics Of Liquid Drops In Ac Electric Fields written by Md. Abdul Halim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
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
Electrohydrodynamics Of Particles And Drops In Strong Electric Fields
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Author : Debasish Das
language : en
Publisher:
Release Date : 2016
Electrohydrodynamics Of Particles And Drops In Strong Electric Fields written by Debasish Das and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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.
Second Microgravity Fluid Physics Conference
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Author :
language : en
Publisher:
Release Date : 1994
Second Microgravity Fluid Physics Conference written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Fluid dynamics (Space environment) categories.
Fundamental Studies On The Dynamics Of Drops In Electric Fields
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Author : Marrivada Nanchara Reddy
language : en
Publisher:
Release Date : 2008
Fundamental Studies On The Dynamics Of Drops In Electric Fields written by Marrivada Nanchara Reddy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
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
Proceedings Of The Royal Society Section A Mathematical And Physical Science
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Author : Royal Society (Great Britain)
language : en
Publisher:
Release Date : 1973
Proceedings Of The Royal Society Section A Mathematical And Physical Science written by Royal Society (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Electronic journals categories.
Intensification Of Liquid Liquid Processes
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Author : Laurence R. Weatherley
language : en
Publisher: Cambridge University Press
Release Date : 2020-04-16
Intensification Of Liquid Liquid Processes written by Laurence R. Weatherley and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-16 with Mathematics categories.
Explore and review novel techniques for intensifying transport and reaction in liquid-liquid and related systems with this essential toolkit. Topics include discussion of the principles of process intensification, the nexus between process intensification and sustainable engineering, and the fundamentals of liquid-liquid contacting, from an expert with over forty-five years' experience in the field. Providing promising directions for investment and for new research in process intensification, in addition to a unique review of the fundamentals of the topic, this book is the perfect guide for senior undergraduate students, graduate students, developers, and research staff in chemical engineering and biochemical engineering.
Applied Science Technology Index
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Author :
language : en
Publisher:
Release Date : 1996
Applied Science Technology Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Engineering categories.
Continuum Electromechanics
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Author : James R. Melcher
language : en
Publisher: MIT Press (MA)
Release Date : 1981-01
Continuum Electromechanics written by James R. Melcher and has been published by MIT Press (MA) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981-01 with Technology & Engineering categories.
Designed to be used as a graduate-level text and as an engineering reference work, "Continuum Electromechanics" presents a comprehensive development of its subject--the interaction of electromagnetic forces and ponderable media, the mechanical responses to electromagnetic fields, and the reciprocal effects of the material motions produced by those fields. The author's approach is highly interdisciplinary, and he introduces fundamental concepts from such subjects as electrohydrodynamics, magnetohydrodynamics, plasma physics, electron beam engineering, fluid mechanics, heat transfer, and physical chemistry.The applications of continuum electromechanics are also remarkably diverse, and many of them are treated in the book, both because of their intrinsic engineering importance and as a means of illustrating basic principles. Among these applications are the design of rotating machines and synchronous generators, polymer processing, magnetic melting and pumping in metallurgical operations, the processing of plastics and glass, the manufacture of synthetic fibers, inductive and dielectric heating, thermal-to-electrical energy conversion, the control of air pollution, the design of controlled-fusion devices, image processing and printing, the magnetic levitation and propulsion of vehicles, the study of films and membranes, and the analysis of the complex electrokinetic and physicochemical processes that underlie the sensing and motor functions of biological systems. Many of these applications are presented in the form of problems.The book consists of eleven chapters, entitled Introduction to Continuum Electromechanics; Electrodynamic Laws; Approximations, and Relations; Electromagnetic Forces, Force Densities, and Stress Tensors; Electromechanical Kinematics; Energy-Conversion Models and Processes; Charge Migration, Convection, and Relaxation; Magnetic Diffusion and Induction Interactions; Laws, Approximations, and Relations of Fluid Mechanics Statics and Dynamics of Systems Having a Static Equilibrium; Electromechanical Flows; Electromechanics with Thermal and Molecular Diffusion; and Streaming Interactions.
Ac Electrokinetics
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Author : Hywel Morgan
language : en
Publisher: Research Studies Press Limited
Release Date : 2003
Ac Electrokinetics written by Hywel Morgan and has been published by Research Studies Press Limited this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Colloids categories.
Biologists, physicists and engineers are working together to make ever-smaller devices capable of studying the properties of tiny biological particles. Using nano-electrodes, encapsulated in a device with dimensions of a few hundred millionths of a metre, it is now possible to manipulate and trap single nano-scale biological particles such as a virus. The precisely controlled electric fields generated within the device can be used to trap single particles in field-cages or separate different viruses from each other, for example. This book is an introduction to the science behind the new technology, and explains how the electric field interacts with the particles. It describes how these micro-systems are manufactured and how they are used to study the electrical properties of the particles.
The Summary Of Engineering Research
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Author : University of Illinois (Urbana-Champaign campus). Engineering Experiment Station
language : en
Publisher:
Release Date : 1995
The Summary Of Engineering Research written by University of Illinois (Urbana-Champaign campus). Engineering Experiment Station and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Engineering categories.