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Filtration Of Ultra Small Particles On Fibrous Filters
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Book Synopsis Filtration of Ultra-small Particles on Fibrous Filters by : Igor Evgenevich Agranovski
Download or read book Filtration of Ultra-small Particles on Fibrous Filters written by Igor Evgenevich Agranovski and published by . This book was released on 1995 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The problem of filtration of liquid aerosols by both wettable and nonwettable filters has been extensively studied and the results of the theoretical calculations together with the experimental results are presented. More realistic models of filtration by both wettable and nonwettable filters have been developed and verified experimentally.--A new instrument has been developed, and used in the experiments, for the measurement of the absolute concentration of aerosols in the gas stream. This instrument is based on the measurement of the initial vapour content of the gas stream simultaneously with the measurement of the vapour content after the total evaporation of aerosol. The concentration of the aerosol is calculated as the difference between these two values. The instrument was developed to provide fast and accurate measurements of aerosol concentration. The main advantages of the instrument are: high accuracy, simplicity of measurement, possibility of use for a wide range of substances, perfect suitability of operation for automatic monitoring technologies, etc. All rights for this instrument have been reserved and the fully automatic version will be available in the near future.--It was found that the efficiency of filtration of aerosol on the wettable filter depends on the thickness of the liquid film on the fibre. This parameter was taken into account in the development of a theoretical model of filtration on wettable fibrous filters. The particle breakthrough problem has been solved by the optimisation of the aspect ratio (the ratio of the height by width) of the wettable filter. On this basis, industrial devices have been developed, patented, and implemented in industry. These devices provide a stable operating efficiency of higher than 99%.--It was found experimentally that the efficiency of filtration of aerosol on the nonwettable filter depends on the diameter of the drop suspended on the filter, and on the area of the filter blocked by drops: this influences the velocity of filtration. All these parameters were taken into account in the development of a theoretical model of filtration on nonwettable fibrous filters.--On the basis of this model, satisfactorily verified by the experiments, an industrial device has been developed. The harnessing of atomisers makes it possible to maintain the efficiency of filtration higher than 99%, even with a relatively high velocity of filtration of 2.7m/s. The new technology is tackling the problem of handling huge amounts of exhaust gases and this is particularly important for cramped installations when the space available for the air pollution control technology is quite limited.--A highly efficient gas cleaning technology has been developed. This technology is based on combining two stages (wet scrubber and filter) of currently utilised air pollution control devices by submerging the fibrous filter into the liquid on the plate. The new device provides an effective division of the main gas stream into ultra-small bubbles which increase the contact area between the gas and liquid phases. It was estimated theoretically and verified experimentally that the efficiency of the proposed 'combined' technology, is 45% higher than the efficiency of the two stages technology. The technology has been patented and will be offered for industrial implementation in the near future.
Book Synopsis Aerosol Filtration by : Dominique Thomas
Download or read book Aerosol Filtration written by Dominique Thomas and published by Elsevier. This book was released on 2016-11-30 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Filtration of aerosols is omnipresent in our daily lives, in areas as diverse as health, the protection of people and the environment, and air treatment inside buildings. However, the collection of particles within a filter media is not, contrary to popular belief, linked to a simple screen effect. The phenomena involved are much more complex and require the consideration of aerosol interactions, filter media and process conditions to select the best fiber filter for a given application. Aerosol Filtration, book for students, hygiene or process engineers, fibrous media manufacturers, designers, and filtration system suppliers or users addresses the filtration of aerosols in six chapters. These chapters cover physics and aerosol characterization, the fibrous media, and efficiency and filter clogging by solid or liquid aerosols, with special attention to the filtration of the nanoparticles. - Analyses the behavior of fibrous media against solid and liquid aerosols - Presents models of efficiency and pressure drop - Introduces computing elements for estimating the lifetime of filters - Provides guidance for designing filters and predicting their behavior over time
Book Synopsis Fibrous Filter Media by : Philip Brown
Download or read book Fibrous Filter Media written by Philip Brown and published by Woodhead Publishing. This book was released on 2017-06-16 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibrous Filter Media comprehensively covers the types, manufacture, applications, performance, and modeling of fibrous filter media. Part I introduces the principles of gas and liquid filtration, while Part II presents an overview of the types of fibrous filters, including details of fiber types, fabric construction, and applications. Part III covers a variety of filtration applications in which fibrous assemblies are used, with examples ranging from filtration for improving air quality, to medical filters, to industrial waste-water filtration. Finally, Part III covers the properties and performance of fibrous filters, including chapters on filter performance and simulation. With its expert editors and international team of contributors, this important book provides information on fibrous filters relevant to fiber and textile scientists, and is also ideal for academics and industry professionals working in the field of filtration. Dr. Philip Brown is Sweetenburg Professor of polymer and textile engineering at Clemson University, USA. Dr. Christopher Cox is Professor of mathematical sciences at Clemson University, USA. - Systematic and comprehensive coverage of the trends and new technologies being developed in the field of fibrous filter media - Focused on the needs of the textiles and filtration industries, with a clear emphasis on applied technology - Contains contributions from an international team of authors edited by an expert in the field
Book Synopsis An Investigation of Aerosol Filtration Via Fibrous Filters by :
Download or read book An Investigation of Aerosol Filtration Via Fibrous Filters written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The most common method of removing particles from a gas stream is via fibrous filters. However, most of the previous studies have been limited to systems consisting of rows of fibers (often in two-dimensional geometries) perpendicular to the flow direction. The current work is aiming to develop an understanding of the role of filter?s microstructure and manufacturing process. In the first part of this study, pressure drop and nanoparticle collection efficiency of lightweight spun-bonded media are simulated by solving the Navier-Stokes equations inside three-dimensional geometries resembling the microstructure of such media. These pressure drop and collection efficiencies showed a perfect agreement with experimental data. In the second part of this work, the influences of fiber length and compaction ratio of filter media on the pressure drop are discussed. Simulation data of staple fiber media have shown good agreement with Davies? empirical equation. Such an agreement indicates that, within the range of dimensions considered, the fiber length has no significant influence on the materials? through-plane permeability as long as the SVF remains constant. Our simulation results for nonwovens with different compaction ratios, together with our experimental data, indicate that pressure drop of the porous media increases with increasing the compaction ratio or temperature of the calender rolls. In the third part of this work, we presented our approach for modeling permeability of fibrous filters with bimodal fiber size distributions (referred to as bimodal filters in this context). The three-dimensional microstructures resembling bimodal filter media with random in-plane fiber orientation distribution were generated to compute their permeability constants. These results were compared with the previous analytical and numerical models as well as our experimental data. Here we concluded that there exists an area-weighted equivalent average diameter for each bimodal filter tha.
Author :Morton D Hull Distinguished Service Professor S Chandrasekhar Publisher : ISBN 13 :9781258667238 Total Pages :114 pages Book Rating :4.6/5 (672 download)
Book Synopsis Stochastic Problems in Physics and Astronomy by : Morton D Hull Distinguished Service Professor S Chandrasekhar
Download or read book Stochastic Problems in Physics and Astronomy written by Morton D Hull Distinguished Service Professor S Chandrasekhar and published by . This book was released on 2013-04 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Includes Diffraction Of X-Rays By Liquid Elements. Edited By J. W. Buchta, A. H. Compton, K. T. Compton, K. K. Darrow, E. C. Kemble And D. L. Webster.
Book Synopsis Handbook of Fibrous Materials, 2 Volumes by : Jinlian Hu
Download or read book Handbook of Fibrous Materials, 2 Volumes written by Jinlian Hu and published by John Wiley & Sons. This book was released on 2020-06-22 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: Edited by a leading expert in the field with contributions from experienced researchers in fibers and textiles, this handbook reviews the current state of fibrous materials and provides a broad overview of their use in research and development. Volume One focuses on the classes of fibers, their production and characterization, while the second volume concentrates on their applications, including emerging ones in the areas of energy, environmental science and healthcare. Unparalleled knowledge of high relevance to academia and industry.
Book Synopsis Modeling Particle Filtration and Caking in Fibrous Filter Media by : Seyed Alireza Hosseini
Download or read book Modeling Particle Filtration and Caking in Fibrous Filter Media written by Seyed Alireza Hosseini and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is aimed at developing modeling methodologies for simulating the flow of air and aerosol particles through fibrous filter media made up of micro- or nano-fibers. The study also deals with modeling particle deposition (due to Brownian diffusion, interception, and inertial impaction) and particle cake formation, on or inside fibrous filters. By computing the air flow field and the trajectory of airborne particles in 3-D virtual geometries that resemble the internal microstructure of fibrous filter media, pressure drop and collection efficiency of micro- or nano-fiber filters are simulated and compared with the available experimental studies. It was demonstrated that the simulations conducted in 3-D disordered fibrous domains, unlike previously reported 2-D cell-model simulations, do not need any empirical correction factors to closely predict experimental observations. This study also reports on the importance of fibers' cross-sectional shape for filters operating in slip (nano-fiber filters) and no-slip (micro-fiber filters) flow regimes. In particular, it was found that the more streamlined the fiber geometry, the lower the fiber drag caused by a nanofiber relative to that generated by its micron-sized counterpart. This work also presents a methodology for simulating pressure drop and collection efficiency of a filter medium during instantaneous particle loading using the Fluent CFD code, enhanced by using a series of in-house subroutines. These subroutines are developed to allow one to track particles of different sizes, and simulate the formation of 2-D and 3-D dendrite particle deposits in the presence of aerodynamic slip on the surface of the fibers. The deposition of particles on a fiber and the previously deposited particles is made possible by developing additional subroutines, which mark the cells located at the deposition sites and modify their properties to so that they resemble solid or porous particles. Our unsteady-state simulations, in qualitative agreement with the experimental observations reported in the literature, predict the rate of increase of pressure drop and collection efficiency of a filter medium as a function of the mass of the loaded particles.
Book Synopsis Numerical Investigation of Particle Filtration Process in Fibrous Filters by : Zhili Liu
Download or read book Numerical Investigation of Particle Filtration Process in Fibrous Filters written by Zhili Liu and published by . This book was released on 1993 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of the Filtration Element Shape on the Filtration Efficiency of a Filter by : Mihai Chiruta
Download or read book The Effect of the Filtration Element Shape on the Filtration Efficiency of a Filter written by Mihai Chiruta and published by . This book was released on 2005 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Separation of Particles from Fibers for Backwashing a Fibrous Filter by : George Ernest Grossmann
Download or read book Separation of Particles from Fibers for Backwashing a Fibrous Filter written by George Ernest Grossmann and published by . This book was released on 1974 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Air Filtration of Microbial Particles by : Herbert M. Decker
Download or read book Air Filtration of Microbial Particles written by Herbert M. Decker and published by . This book was released on 1962 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Nonwoven Materials by : Dipayan Das
Download or read book Composite Nonwoven Materials written by Dipayan Das and published by Elsevier. This book was released on 2014-03-14 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite nonwoven materials are versatile materials with a variety of applications, including hygiene, medicine and filtration. This important book provides a technical resource for professionals and academics in the field. It explores these materials in terms of fiber types used, manufacturing processes, structure, and physical properties. The first part of the book focuses on the use of natural and synthetic fibers in composite nonwovens, discusses their structure in terms of fiber packing and alignment, and their physical properties. Further chapters deal with the practical applications of composite nonwoven materials. Hygiene applications, such as diapers, female sanitary products, incontinence pads, and wipes are covered, as well as composite nonwoven-based medical products and filters. Composite Nonwoven Materials is an ideal reference for R&D managers in the textile industry and academic researchers in textile science. - Systematic and comprehensive information on composite nonwovens - Critical review of progress in research and development on composite nonwovens - Comment on future research direction and ideas for product development
Book Synopsis Handbook of Nonwoven Filter Media by : Irwin M. Hutten
Download or read book Handbook of Nonwoven Filter Media written by Irwin M. Hutten and published by Butterworth-Heinemann. This book was released on 2015-10-24 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Handbook of Nonwoven Filter Media, Second Edition provides readers with a fundamental understanding of nonwoven filter media. It is one of the few books dealing exclusively with the subject, and is primarily intended as a reference for people in the nonwovens industry (industry and academic researchers, technical, marketing , and quality control personnel) and universities offering courses in filtration theory and practice and nonwovens technology.The book includes applications for gas, liquid, and engine filtration, and identifies the types of filter media used in these applications. The various separation technologies that can be achieved with nonwoven filter media are revealed and discussed. Theoretical presentation is based on flow through porous media, and is developed around a nonwovens or engineered fabrics orientation. - Presents the latest information on legislative, regulatory, environmental and sustainability issues affecting the nonwovens and filtration industries - Includes a comprehensive discussion of Computational Flow Dynamics (CFD) by Dr. George Chase, University of Akron, USA - Includes the latest Global and North American marketing statistics for filters and filter media prepared by Brad Kalil of INDA
Book Synopsis Sustainable Energy And Environmental Technology - Proceedings Of The Asia-pacific Conference by : Aik Chong Lua
Download or read book Sustainable Energy And Environmental Technology - Proceedings Of The Asia-pacific Conference written by Aik Chong Lua and published by World Scientific. This book was released on 1996-06-17 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: The countries in the Asia-Pacific region enjoy economic growth rates amongst the highest in the world today. It has transformed the nature of their industries and raised the living standards of the populace. The accelerated developments in these countries have, however, created severe demands on energy and the environment.This conference aimed to address issues related to energy and environmental protection in the quest for sustainble development. It will bring together participants from academia, industries and government agencies, from over 18 countries primarily in the Asia-Pacific region, and provide a forum for them to interact, share information, report research in progress and identify opportunities in the relevant fields.
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309443628 Total Pages :159 pages Book Rating :4.3/5 (94 download)
Book Synopsis Health Risks of Indoor Exposure to Particulate Matter by : National Academies of Sciences, Engineering, and Medicine
Download or read book Health Risks of Indoor Exposure to Particulate Matter written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-10-26 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Environmental Protection Agency (EPA) defines PM as a mixture of extremely small particles and liquid droplets comprising a number of components, including "acids (such as nitrates and sulfates), organic chemicals, metals, soil or dust particles, and allergens (such as fragments of pollen and mold spores)". The health effects of outdoor exposure to particulate matter (PM) are the subject of both research attention and regulatory action. Although much less studied to date, indoor exposure to PM is gaining attention as a potential source of adverse health effects. Indoor PM can originate from outdoor particles and also from various indoor sources, including heating, cooking, and smoking. Levels of indoor PM have the potential to exceed outdoor PM levels. Understanding the major features and subtleties of indoor exposures to particles of outdoor origin can improve our understanding of the exposureâ€"response relationship on which ambient air pollutant standards are based. The EPA's Indoor Environments Division commissioned the National Academies of Sciences, Engineering, and Medicine to hold a workshop examining the issue of indoor exposure to PM more comprehensively and considering both the health risks and possible intervention strategies. Participants discussed the ailments that are most affected by particulate matter and the attributes of the exposures that are of greatest concern, exposure modifiers, vulnerable populations, exposure assessment, risk management, and gaps in the science. This report summarizes the presentations and discussions from the workshop.
Book Synopsis Principles of Filtration by : Chi Tien
Download or read book Principles of Filtration written by Chi Tien and published by Elsevier. This book was released on 2012-02-29 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers filtration in various modes of operation for both solid/gas and solid/liquid suspensions. It provides the necessary knowledge and background information to prepare and equip persons who are interested in serious filtration work. It is a useful reference/text for students and practicing engineers. It can also be adopted as an advanced text book for various engineering courses in chemical, environmental, mechanical and metallurgical engineering.The book presents analysis and treatment of filtration processes employing different filter media operating in various modes for both gas/solid and liquid/solid systems. - Presents a concise overview of filtration enabling full understanding of the applications as well as theunderlying theoretical foundations - Presents filtration techniques in its entirety, i.e. gas/solid and liquid.solid separations and outlines their differences, coverage not found in any of the existing publications - Presents rational procedures for analysing experimental data in a clear and easy to understand fashion by students and engineers - Includes numerous illustrative examples enabling understanding of the underlying theory and selection of the most suitable solution for the particular application - Provides detailed filter parameters (efficiency coefficients) vital in the design of filters - Includes problems and solutions at the end of each chapter connecting the theoretical concepts with the practical aspects for engineers - Written by the top expert on the subject of filtration
Book Synopsis Respiratory Protection Handbook by : Ching-tsen Bien
Download or read book Respiratory Protection Handbook written by Ching-tsen Bien and published by CRC Press. This book was released on 2023-07-28 with total page 555 pages. Available in PDF, EPUB and Kindle. Book excerpt: For novices and experienced health and safety professionals alike, the Respiratory Protection Handbook fills a critical gap in the respiratory protection literature. This extensive guide provides all the information you need to dramatically expand your understanding of the concepts and day-to-day operations of respiratory protection. It is a fully self-contained text that expertly accomplishes two goals: first, for the novice, it clearly explains how to establish and implement an effective respiratory protection program; and second, for the experienced professional, it provides in-depth knowledge that goes beyond basics. Respiratory Protection Handbook addresses the development of respiratory protection devices, the capabilities and limitations of specific respirators, the respirator certification system, how to select appropriate filters, how to predict the service life of sorbents, fit testing methods, assigned protection factors, and much more. Nowhere else will you find a single source on this topic containing so much information.
