Fundamental Studies On The Dynamics Of Drops In Electric Fields
DOWNLOAD
Download Fundamental Studies On The Dynamics Of Drops In Electric Fields PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Fundamental Studies On The Dynamics Of Drops In Electric Fields book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Fundamental Studies On The Dynamics Of Drops In Electric Fields
DOWNLOAD
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
Fundamental Studies Of Fluid Mechanics
DOWNLOAD
Author :
language : en
Publisher:
Release Date : 2014
Fundamental Studies Of Fluid Mechanics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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.
Droplet Dynamics Under Extreme Ambient Conditions
DOWNLOAD
Author : Kathrin Schulte
language : en
Publisher: Springer Nature
Release Date : 2022
Droplet Dynamics Under Extreme Ambient Conditions written by Kathrin Schulte and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Drops categories.
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.
Electrohydrodynamics Of Particles And Drops In Strong Electric Fields
DOWNLOAD
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.
Fundamentals Of Low Gravity Fluid Dynamics And Heat Transfer
DOWNLOAD
Author : Basil N. Antar
language : en
Publisher: CRC Press
Release Date : 2019-07-23
Fundamentals Of Low Gravity Fluid Dynamics And Heat Transfer written by Basil N. Antar and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-07-23 with Technology & Engineering categories.
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.
Students Understanding Of Research Methodology In The Context Of Dynamics Of Scientific Progress
DOWNLOAD
Author : Mansoor Niaz
language : en
Publisher: Springer
Release Date : 2016-04-20
Students Understanding Of Research Methodology In The Context Of Dynamics Of Scientific Progress written by Mansoor Niaz and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-04-20 with Science categories.
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.
The Role Of Physical Properties On The Dynamics Of Drop Formation From A Capillary In An Electric Field
DOWNLOAD
Author : Osman Basaran
language : en
Publisher:
Release Date : 1998
The Role Of Physical Properties On The Dynamics Of Drop Formation From A Capillary In An Electric Field written by Osman Basaran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Chemical engineering categories.
Second Microgravity Fluid Physics Conference
DOWNLOAD
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.
Studies Of Droplet Transport Processes In An Electric Field
DOWNLOAD
Author : Hoa Duc Nguyen
language : en
Publisher:
Release Date : 1989
Studies Of Droplet Transport Processes In An Electric Field written by Hoa Duc Nguyen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Drops categories.
Transport Phenomena With Drops And Bubbles
DOWNLOAD
Author : Satwindar S. Sadhal
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Transport Phenomena With Drops And Bubbles written by Satwindar S. Sadhal and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Fluid flows that transfer heat and mass often involve drops and bubbles, particularly if there are changes of phase in the fluid in the formation or condensation of steam, for example. Such flows pose problems for the chemical and mechanical engineer significantly different from those posed by single-phase flows. This book reviews the current state of the field and will serve as a reference for researchers, engineers, teachers, and students concerned with transport phenomena. It begins with a review of the basics of fluid flow and a discussion of the shapes and sizes of fluid particles and the factors that determine these. The discussion then turns to flows at low Reynolds numbers, including effects due to phase changes or to large radial inertia. Flows at intermediate and high Reynolds numbers are treated from a numerical perspective, with reference to experimental results. The next chapter considers the effects of solid walls on fluid particles, treating both the statics and dynamics of the particle-wall interaction and the effects of phase changes at a solid wall. This is followed by a discussion of the formation and breakup of drops and bubbles, both with and without phase changes. The last two chapters discuss compound drops and bubbles, primarily in three-phase systems, and special topics, such as transport in an electric field.