Modeling Particle Filtration And Caking In Fibrous Filter Media

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Modeling Particle Filtration and Caking in Fibrous Filter Media

Author : Seyed Alireza Hosseini
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (747 download)

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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.

Aerosol Filtration

Author : Dominique Thomas
Publisher : Elsevier
ISBN 13 : 008102116X
Total Pages : 228 pages
Book Rating : 4.0/5 (81 download)

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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

Fibrous Filter Media

Author : Philip Brown
Publisher : Woodhead Publishing
ISBN 13 : 0081005822
Total Pages : 318 pages
Book Rating : 4.0/5 (81 download)

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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

Dust Filtration and Loading by Fibrous and Foam Media

Author : Wai Sing Poon
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Dust Filtration and Loading by Fibrous and Foam Media by : Wai Sing Poon

Download or read book Dust Filtration and Loading by Fibrous and Foam Media written by Wai Sing Poon and published by . This book was released on 1997 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Numerical Investigation of Particle Filtration Process in Fibrous Filters

Author : Zhili Liu
Publisher :
ISBN 13 :
Total Pages : 370 pages
Book Rating : 4.:/5 (89 download)

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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:

Fundamental Study on Particle Filtration Process and Gasoline Particulate Filter (GPF) Modeling

Author : Yangdongfang Yang
Publisher :
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4.:/5 (17 download)

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Book Synopsis Fundamental Study on Particle Filtration Process and Gasoline Particulate Filter (GPF) Modeling by : Yangdongfang Yang

Download or read book Fundamental Study on Particle Filtration Process and Gasoline Particulate Filter (GPF) Modeling written by Yangdongfang Yang and published by . This book was released on 2018 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Porous materials are widely used to separate mixtures such as gas/solid and liquid/solid, with the desired characteristics being low pressure drop and high separation. In the automotive exhaust aftertreatment area, two types of filtration are commonly studied, deep bed filtration and cake filtration. Deep bed filtration is filtration inside the porous material, while cake filtration is filtration by the particulate cake layer, which generally has both high filtration efficiency and high pressure drop. The unit collector concept was developed to model the porous material statistically and with lower computational cost. The standard unit collector model with spherical collectors was found to have high fidelity in predicting Diesel Particulate Filter (DPF) performance, where cake filtration is dominant. Nevertheless, the deep bed filtration process is still difficult to capture, due to its complexity and the continuous wall structure changes that occur during deposition. The development of a model that can capture the changes in the microstructure and properties of the porous material is extremely helpful to understand the filtration process and could be used in real device design. In the current study, the unit collector model is successfully extended to the deep bed filtration area. A Pore Filtration Model (PFM) is developed using the constricted tube concept, which has the advantages of lower computational cost and higher accuracy, as the collector. A complete solution is provided in the current study, including the model development process, validation, and performance. Data from a spark ignition direct injection (SIDI) engine is used to validate the model for significantly different particulate conditions occurring under four different operating conditions. Details of the modeling process, including individual unit collector analysis, and the combination of constricted tube collectors, are presented. The differences in the overall filtration efficiency from the experimental measurements and the simulations are within 3%. Comparisons of the spherical collector and the constricted tube collector through both theoretical analysis and simulation results confirm the advantage of the PFM. Besides the model development process, the PFM performance is also investigated. The effect of the geometry of the constricted tube collector on the filtration efficiency is examined. The simulation study indicates porous materials with high porosity and narrow pores have high filtration efficiency. Additionally, the filtration is analyzed for various operating conditions with an objective of understanding the real filtration circumstances.

Filtration

Author : Clyde Orr
Publisher : Marcel Dekker
ISBN 13 :
Total Pages : 552 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Filtration by : Clyde Orr

Download or read book Filtration written by Clyde Orr and published by Marcel Dekker. This book was released on 1977 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Air Filtration

Author : Charles Norman Davies
Publisher :
ISBN 13 :
Total Pages : 194 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Air Filtration by : Charles Norman Davies

Download or read book Air Filtration written by Charles Norman Davies and published by . This book was released on 1973 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Characteristics of Membrane Filters for Particle Collection

Author : Kenneth L. Rubow
Publisher :
ISBN 13 :
Total Pages : 21 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Characteristics of Membrane Filters for Particle Collection by : Kenneth L. Rubow

Download or read book Characteristics of Membrane Filters for Particle Collection written by Kenneth L. Rubow and published by . This book was released on 1986 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary is given of the aerosol filtration models for membrane filter media. While the capillary tube model has been shown to accurately predict the particle collection characteristics of Nuclepore membrane filters, the fibrous filter model gives more accurate prediction for the conventional solvent-cast membranes. Excellent agreement has been found between the effective fiber diameter used in the model and the diameter of the fiber-like structures in the conventional membrane. Results are presented showing the comparisons of the measured filter penetration with the theoretically predicted value for various particle sizes and filtration velocities. Excellent agreement has been obtained both in the degree of particle penetration through the filter and the location of the most penetrating particle size. For the conventional membranes the most penetrating particle size is typically in the range of 0.05 to 0.2 um diameter.

World Congress on Particle Technology 3

Author :
Publisher : IChemE
ISBN 13 : 9780852954010
Total Pages : 256 pages
Book Rating : 4.9/5 (54 download)

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Book Synopsis World Congress on Particle Technology 3 by :

Download or read book World Congress on Particle Technology 3 written by and published by IChemE. This book was released on 1998 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: A world conference held in this area every four years, with 1998 being the third. IChemE publishes the proceedings, and this time they are presented in CD-ROM format. Amongst the plenary contributors is Sir Harold Kroto on Buckminsterfullerenes.

Principles of Filtration

Author : Chi Tien
Publisher : Elsevier
ISBN 13 : 0444563660
Total Pages : 353 pages
Book Rating : 4.4/5 (445 download)

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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 2012-04-19 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

An Investigation of Aerosol Filtration Via Fibrous Filters

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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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.

Fabric Filtration for Combustion Sources

Author : R.P. Donovan
Publisher : CRC Press
ISBN 13 : 1000146677
Total Pages : 449 pages
Book Rating : 4.0/5 (1 download)

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Book Synopsis Fabric Filtration for Combustion Sources by : R.P. Donovan

Download or read book Fabric Filtration for Combustion Sources written by R.P. Donovan and published by CRC Press. This book was released on 2020-08-14 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the most important applications of fabric filtration: environmental protection, particulate control from combustion sources. It summarises the types of fibers and their properties and gives an overview of textile processing.

Advanced Computational Approaches for Water Treatment

Author : Krunal M Gangawane
Publisher : CRC Press
ISBN 13 : 100095658X
Total Pages : 234 pages
Book Rating : 4.0/5 (9 download)

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Book Synopsis Advanced Computational Approaches for Water Treatment by : Krunal M Gangawane

Download or read book Advanced Computational Approaches for Water Treatment written by Krunal M Gangawane and published by CRC Press. This book was released on 2023-09-20 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: A rapid growth in global industrialization and population has triggered intense environmental pollution that has led to a water crisis, resulting in the decay in the quality of human life and economic losses. Novel water purification techniques are expected to alleviate this challenge. Recently, various water purification techniques, along with different computational techniques, have been developed. For instance, water purification techniques, such as electromagnetic water purification, solute-surface interactions in water, use of micro-magnetofluidic devices, UV-led water purification, and use of membranes can be thoroughly investigated by using a range of computation techniques, such as molecular dynamics, the lattice Boltzmann method, and the Navier-Stokes method-based solver. Advanced Computational Approaches for Water Treatment: Applications in Food and Chemical Engineering, presents these different numerical techniques and traditional modeling and simulation approaches to elaborate on and explain the various water purification techniques. Features: Serves as a dedicated reference for this emerging topic Discusses state of the art developments in advanced computational techniques for water purification Brings together diverse experience in this field in one reference text Provides a roadmap for future developments in the area This book is primarily intended for chemical engineers, hydrologists, water resource managers, civil engineers, environmental engineers, food scientists and food engineers interested in understanding the numerical approaches for different water purification techniques, such as membrane, sedimentation, filtration, micromagnetofluidic device, and ozone/UV, among others.

Aerosol Filtration

Author : Qisheng Ou
Publisher :
ISBN 13 :
Total Pages : 208 pages
Book Rating : 4.:/5 (858 download)

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Book Synopsis Aerosol Filtration by : Qisheng Ou

Download or read book Aerosol Filtration written by Qisheng Ou and published by . This book was released on 2013 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle control technologies are essential in many manufacturing industries (electronic and chemical industrial, mineral processing, and food and beverages) as well as in pollution abatement and environmental control (for example, post processing of power plant emissions and clean rooms). A variety of particle control technologies using various mechanisms have been developed. Among these technologies, filtration is known as the most economical for achieving high removal efficiency of fine aerosol particles. In numerous existing studies on the loading process of particle filtration, two assumptions are usually made: (1) particles are spherical or nearly spherical in shape and (2) particles are uniformly deposited on filter medium. However, in practical applications, these two assumptions are not always met. Agglomerate particles with non-spherical shape are ubiquitous in industrial processing and ambient environment, and non-uniform particle depositions are often met. The overall objective of this dissertation is to advance our current knowledge on these two specific areas of aerosol filtration: (1) agglomerate particle filtration and (2) particle deposition uniformity. For the first part, Agglomerate Particle Filtration, a system which is able to generate stable and controllable agglomerate particles was developed. Both branch-like and chain-like agglomerate particles were generated through the system, and their morphologies were characterized using both online and offline methods. Series of filter loading experiments were performed to study the filtration behavior of fibrous filters loaded with agglomerate particles over the entire filter lifetime, including the initial filtration, depth filtration, transition filtration and surface filtration. The filtration and loading of agglomerate particles exhibited different behaviors than those of spherical particles. Different effects, including filter media, fractal dimension of agglomerate particles, and the overall mobility size of agglomerate particles, on the loading behavior were explored. Moreover, for predicting the loading behavior of agglomerate particles, two semi-empirical models were proposed by modifying existing models. Good agreements were found for both of them. For the second part, Particle Deposition Uniformity, particle depositions under two scenarios were investigated. In the first scenario, particle deposition along pleated filter panels was studied using a COMSOL-Matlab based numerical model. The evolutions of particle deposition profile and pressure drop of pleated filter panels during dynamic particle loading process were investigated. The model was validated by experimental loading tests. In the second scenario, particle deposition uniformity on HVAC entrance filter panels installed in an aircraft was studied by a computational fluid dynamics model. The flow fields around entrance filter panels and particle depositions on them were investigated. Factors affecting particle deposition uniformity were identified and explored.

Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols

Author : Wallace Woon-Fong Leung
Publisher : Elsevier
ISBN 13 : 0323859852
Total Pages : 572 pages
Book Rating : 4.3/5 (238 download)

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Book Synopsis Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols by : Wallace Woon-Fong Leung

Download or read book Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols written by Wallace Woon-Fong Leung and published by Elsevier. This book was released on 2021-10-30 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanofiber Filter Technologies for Filtration of Submicron Aerosols and Nanoaerosols covers the nanoaerosols (less than 100 nanometers) to larger submicron aerosols due mostly to pollution, which are present in high number concentration in our surroundings. People are breathing these nanoaerosols daily without being aware of it. Airborne viruses from flu to coronaviruses are also nanoaerosols. During the COVID-19 pandemic, it took a long time for health authorities and the General Public to recognize the airborne transmission mode of the virus. This leads to inadequate protection and ineffective virus control strategies resulting in high infection and death rates. The book cites evidence and observations pointing to the airborne transmission mode of the coronavirus. It also discusses different filtration technologies using nanofibers to capture these aerosols for short-term filtration, where aerosols are trapped in the filter (depth filtration), and long-term filtration, where aerosols are trapped in the growing filter cake (cake filtration). This book provides a good understanding on how nanofibers, which is of size 1/1000 times that of a normal human hair, can effectively filter these tiny aerosols. NFT, organized in four sections – fundamentals, deep understanding, technologies, and application, covering comprehensively on the subject, is a valuable resource for undergraduates and graduates, engineers, researchers and practitioners in related industries. - Describes technologies with insight and use basic engineering principles to build-up technologies - Includes extensive clear and understandable figures and tables to enhance key concepts - Uses examples throughout to explain engineering principles and interdisciplinary concepts - The only book in the market focusing on nanofiber filter technologies for filtering submicron aerosols and nanoaerosols

Modeling of Internal Flow Field and Particle Filtration of Electro-statically Charged Monolith Filters

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (656 download)

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Book Synopsis Modeling of Internal Flow Field and Particle Filtration of Electro-statically Charged Monolith Filters by :

Download or read book Modeling of Internal Flow Field and Particle Filtration of Electro-statically Charged Monolith Filters written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibrous and membrane filters are very commonly used for filtration. In this study we use monolith filters, holes arranged on thin film, which are similar to membranes except that holes are precisely drilled. Such filters insure a high surface to volume ratio, which improves overall filtration efficiencies as particle capture occurs on the surface of the membrane. This study involves filtration of sub-micron particles using electrostatically charged monoliths and modeling such a filter presents many challenges. At such a length scales, although the flow is laminar, wall boundary may have to be modeled as slip. Another, perhaps more important, challenge is to model realistic electric field. The flow field and filtration efficiency of electrostatically charged micro-channel filters under cross flow conditions were modeled. Particles with diameters larger than 2 microns were considered in this study, and hence the effects of Brownian motion were not included in the simulations. We investigated the effects of particle size and electrostatic charge on the filtration efficiency. The simulation results of electric field matched qualitatively to experimental data generated using electrostatic force microscopy (EFM) and compared with theoretical values calculated using GaussÃ¢â'¬â"¢s Law. From the simulations, we found that for particle sizes greater than three microns, inertial impaction was the dominant force. Moreover results show that such filters can be used to separate out a particular size of particles. This also depends on the ratio of particle radius to hole-radius, velocity of uid, pressure drop across the filter and arrangement of holes in the filter.