Download or read book Microparticle Dynamics in Electrostatic and Flow Fields written by Sheng Chen and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis proposes new approaches for modelling contacting interactions and electrostatic interactions between microparticles in the framework of the discrete element method and presents a systematic investigation on the agglomeration, migration and deposition of microparticles in presence of electrostatic and flow fields. It reports an exponential-form scaling for the size distribution of early-stage agglomerates in homogeneous isotropic turbulence and formulate the agglomeration and deagglomeration rates. The evolution of spherical clouds of charged particles that migrate under the action of an external electrostatic field is then investigated. Scaling laws of cloud radius and particle number density are obtained by solving a continuum convection equation. Finally, it investigates the deposition of charged particles on a flat plane and fibers. A dimensionless adhesion parameter is constructed to predict the structure of deposits. The temporal evolution of the deposit structure, particle capture efficiency, and the pressure drop are displayed with varying values of Coulomb repulsion and adhesion magnitudes. .
Download or read book Microparticle Dynamics in Electrostatic and Flow Fields written by Sheng Chen and published by Springer Nature. This book was released on 2023-04-30 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis proposes new approaches for modelling contacting interactions and electrostatic interactions between microparticles in the framework of the discrete element method and presents a systematic investigation on the agglomeration, migration and deposition of microparticles in presence of electrostatic and flow fields. It reports an exponential-form scaling for the size distribution of early-stage agglomerates in homogeneous isotropic turbulence and formulate the agglomeration and deagglomeration rates. The evolution of spherical clouds of charged particles that migrate under the action of an external electrostatic field is then investigated. Scaling laws of cloud radius and particle number density are obtained by solving a continuum convection equation. Finally, it investigates the deposition of charged particles on a flat plane and fibers. A dimensionless adhesion parameter is constructed to predict the structure of deposits. The temporal evolution of the deposit structure, particle capture efficiency, and the pressure drop are displayed with varying values of Coulomb repulsion and adhesion magnitudes.
Download or read book Adhesive Particle Flow written by Jeffery S. Marshall and published by Cambridge University Press. This book was released on 2014-03-31 with total page 361 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is targeted at professionals and graduate students working in disciplines where flow of adhesive particles plays a significant role.
Download or read book Frattura ed Integrit Strutturale Annals 2009 written by Aa.vv. and published by Gruppo Italiano Frattura. This book was released on 2010-01-01 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annals of the Italian Group of Fracture journal "Frattura ed Integrità Strutturale" (issues 7 - 10, 2009)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electromechanics and Electrorheology of Fluid Flow with Internal Micro particle Electrorotation written by Hsin-Fu Huang and published by . This book was released on 2010 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: The negative electrorheological responses of two dimensional Couette and Poiseuille flows with internal micro-particle electrorotation are modeled and analyzed via a set of "fully continuum mechanical modeling field equations" formulated in this thesis. By combining the theories of particle electromechanics and continuum anti-symmetric/couple stresses, general governing equations are presented to describe the physical aspects of mass conservation, linear momentum balance, angular momentum balance, and electro-quasi-static field of the negative electrorheological fluid flow. A "rotating coffee cup model" is also developed for the first time to derive the retarding polarization relaxation equation with its accompanying equilibrium retarding polarization in order to characterize the non-equilibrium motion effects of the continuum spin velocity, co, continuum linear velocity, v, and micro-particle rotation speed, n, on the polarization responses as well as the electrical body torque inputs in the negative electrorheological flow field. Using the general assumptions of steady, incompressible, fully developed, and two dimensional flows, we reduce and simplify the full general governing equations in the zero spin viscosity and the finite spin viscosity small spin velocity limits for both Couette and Poiseuille flow geometries. In the zero spin viscosity limit, expressions for the spin velocity and effective viscosity of Couette flow as well as the spin velocity, linear velocity, and two dimensional volume flow rate of Poiseuille flow are derived in terms of the applied direct current electric field strength, shear rate (for Couette flow), driving pressure gradient (for Poiseuille flow), and spatial coordinate by solving the simplified continuum linear and angular momentum equations with the linear flow velocity being subjected to the no-slip boundary condition. As for the finite spin viscosity small spin velocity limit, analytical solutions to the spin velocity, linear velocity, and effective viscosity of Couette flow as well as solutions to the spin velocity, linear velocity, and two dimensional volume flow rate of Poiseuille flow are obtained and expressed in terms of the applied direct current electric field strength, boundary condition selection parameter (p), spin viscosity, and driving shear rate (for Couette flow) or pressure gradient (for Poiseuille flow) by solving a set of differential equations coupling the linear and angular momentum balances of the negative electrorheological fluid flow subjected to the no-slip and co=0.5/Vxv (with 0, 1) boundary conditions. After obtaining the solutions in the respective zero spin viscosity and finite spin viscosity small spin velocity limits, series of parametric studies are then performed on these solutions via varying the pertinent physical parameters involved in several parametric regimes of interest so as to illustrate the negative electrorheological behavior and fluid flow response due to internal micro-particle electrorotation. Modeling results in the two limits generally show that with a direct current electric field applied perpendicularly to the flow direction, the spin velocity is increased and the effective viscosity is decreased as compared to the zero electric field values of the electrorheological fluid flow in Couette geometries at a given driving shear rate. It is also found that with a constant driving pressure gradient, the internal micro-particle electrorotation induces increased continuum fluid spin velocity, linear flow velocity, and two-dimensional volume flow rate on the macroscopic level in Poiseuille flow geometries when a direct current electric field perpendicular to the direction of flow is applied. Results of the Couette effective viscosity and Poiseuille volume flow rate obtained from our present continuum mechanical formulation are further compared to the experimental measurements as well as modeling results from single particle dynamics based two-phase volume averaged effective medium analysis found in current literature. With the "rotating coffee cup" fluid polarization model, the present zero spin viscosity continuum solutions to the effective viscosity and volume flow rate agree with the theoretical solutions obtained from single particle dynamics analysis. The zero spin viscosity solutions to the Couette effective viscosity also fall closer to the experimental measurements reported in current literature for low to moderate direct current electric field strengths. Moreover, the present continuum mechanical formulation in the finite spin viscosity small spin velocity limit is more capable of accurately capturing the negative electrorheological flow responses in the low shear rate and low driving pressure gradient flow regimes characterized by the respective Couette effective viscosity and Poiseuille volume flow rate. These finite spin viscosity small spin velocity results agree better with previous experimental measurements reported in the literature and bring the theoretical modeling of the negative electrorheological flow phenomenon due to internal micro-particle electrorotation closer to physical reality-both of which were generally not possible in previous literature. This important improvement in modeling the negative electrorheological response considered in this thesis is due to our proposed "rotating coffee cup model," which is likely the first model to treat the continuum spin velocity and the micro-particle rotation speed as separate physical variables. Using the finite spin viscosity small spin velocity analysis, we also derive for the first time a characteristic length scale determined by the balances between the electrical body torque input and the angular momentum conversion between the linear and spin velocity fields, which can be used to explain why the present continuum zero spin viscosity solutions are very much similar to those obtained from single particle dynamics based two-phase volume averaged effective medium analysis found in current literature. Future work includes a more advanced modeling of the polarization relaxation processes in the negative electrorheological fluid flow, the full non-linear analysis of finite spin viscosity effects on the angular momentum balances within the electrorheological flow field without the restriction of the small spin velocity limit, and the search of possible applications of our proposed continuum mechanical modeling field equations theory in the research areas of micro/nano-fluidics, biofluid dynamics, and engineering torque-shear rate control systems.
Download or read book Electrostatic Particle Charging written by John Farrell Hughes and published by Taylor & Francis Group. This book was released on 1997 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental look at how individual solid particles may be electrically charged and manipulated in such a way as to be of practical use. Powder coating, precipitation and electrocopying are the three most familiar applications of charged particles. In addition, this books highlights less well-known applications, including those related to health care.Provides wide coverage of applications, including electrostatic control of airborne allergens. -- Mathematics is kept to a minimum, making the book accessible to newcomers as well as specialists in the field. -- Includes discussion of future trends in this emerging field.
Download or read book Aerospace Engineering Education During the First Century of Flight written by Barnes Warnock McCormick and published by AIAA. This book was released on 2004 with total page 938 pages. Available in PDF, EPUB and Kindle. Book excerpt: On 17 December 1903 at Kitty Hawk, NC, the Wright brothers succeeded in achieving controlled flight in a heavier-than-air machine. This feat was accomplished by them only after meticulous experiments and a study of the work of others before them like Sir George Cayley, Otto Lilienthal, and Samuel Langley. The first evidence of the academic community becoming interested in human flight is found in 1883 when Professor J. J. Montgomery of Santa Clara College conducted a series of glider tests. Seven years later, in 1890, Octave Chanute presented a number of lectures to students of Sibley College, Cornell University entitled Aerial Navigation. This book is a collection of papers solicited from U. S. universities or institutions with a history of programs in Aerospace/Aeronautical engineering. There are 69 institutions covered in the 71 chapters. This collection of papers represents an authoritative story of the development of educational programs in the nation that were devoted to human flight. Most of these programs are still in existence but there are a few papers covering the history of programs that are no longer in operation. documented in Part I as well as the rapid expansion of educational programs relating to aeronautical engineering that took place in the 1940s. Part II is devoted to the four schools that were pioneers in establishing formal programs. Part III describes the activities of the Guggenheim Foundation that spurred much of the development of programs in aeronautical engineering. Part IV covers the 48 colleges and universities that were formally established in the mid-1930s to the present. The military institutions are grouped together in the Part V; and Part VI presents the histories of those programs that evolved from proprietary institutions.
Download or read book Micro and Nanoscale Fluid Mechanics written by Brian J. Kirby and published by Cambridge University Press. This book was released on 2010-07-26 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text focuses on the physics of fluid transport in micro- and nanofabricated liquid-phase systems, with consideration of gas bubbles, solid particles, and macromolecules. This text was designed with the goal of bringing together several areas that are often taught separately - namely, fluid mechanics, electrodynamics, and interfacial chemistry and electrochemistry - with a focused goal of preparing the modern microfluidics researcher to analyse and model continuum fluid mechanical systems encountered when working with micro- and nanofabricated devices. This text serves as a useful reference for practising researchers but is designed primarily for classroom instruction. Worked sample problems are included throughout to assist the student, and exercises at the end of each chapter help facilitate class learning.
Download or read book Acid Precipitation written by and published by . This book was released on 1991-07 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optoelectronics written by Sergei Pyshkin and published by BoD – Books on Demand. This book was released on 2017-07-12 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optoelectronics - Advanced Device Structures (Book IV) is following the Optoelectronics (Books I, II, and III) published in 2011, 2013, and 2015, as part of the InTech collection of international works on optoelectronics. Accordingly, as with the first three books of the collection, this book covers recent achievements by specialists around the world. The growing number of countries participating in this endeavor as well as joint participation of the US and Moldova scientists in edition of this book testifies to the unifying effect of science. An interested reader will find in the book the description of properties and applications employing organic and inorganic materials, as well as the methods of fabrication and analysis of operation and regions of application of modern optoelectronic devices.
Download or read book Physics of the Atmosphere Climatology and Environmental Monitoring written by Robert Zakinyan and published by Springer Nature. This book was released on 2022-12-01 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings book presents a discussion by leading scientists and specialists of the latest scientific results, developed methods, technologies and technical means of research and pilot work in the field of geosciences and environmental management. An important task is to familiarize young specialists, teachers, graduate students and students with the current state and the latest world achievements in this field of knowledge. Currently, there is a rapid and significant climate change, which manifests itself not only in global warming, but also in noticeable changes in other atmospheric and climatic characteristics among others.
Download or read book BioMEMS and Biomedical Nanotechnology written by Rashid Bashir and published by Springer Science & Business Media. This book was released on 2007-04-03 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Volume 4 is a balanced review of key aspects of BioMEMS sensors, including (i) BioMEMS sensors and materials, (ii) means of manipulating biological entities at the microscale, and (iii) micro-fluidics and characterization. These three sections provide a succinct review of important topics within one volume of this series.
Download or read book Current Awareness in Particle Technology written by and published by . This book was released on 1995 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Behavior of Materials Volume 1 written by Vijay Chalivendra and published by Springer Science & Business Media. This book was released on 2012-09-27 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1: Proceedings of the 2012 Annual Conference on Experimental and Applied Mechanics represents one of seven volumes of technical papers presented at the Society for Experimental Mechanics SEM 12th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 11-14, 2012. The full set of proceedings also includes volumes on Challenges in Mechanics of Time -Dependent Materials and Processes in Conventional and Multifunctional Materials, Imaging Methods for Novel Materials and Challenging Applications, Experimental and Applied Mechanics, 2nd International Symposium on the Mechanics of Biological Systems and Materials 13th International Symposium on MEMS and Nanotechnology and, Composite Materials and the 1st International Symposium on Joining Technologies for Composites.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Papers from 2017 International Conference on Micro Nanomachines written by Jianguo Guan and published by MDPI. This book was released on 2018-08-09 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Selected Papers from 2017 International Conference on Micro/Nanomachines" that was published in Micromachines
