[PDF] Nanofiber Filter Media For Air And Hot Gas Filtration Applications eBook

Author : Bharath Raghavan
Publisher : LAP Lambert Academic Publishing
Page : 172 pages
File Size : 16,14 MB
Release : 2011-06
Category :
ISBN : 9783844314991

GET BOOK

Nonwoven fibrous media with nanofibers have significant filtration applications in automotive, chemical, transportation, power generation and pharmaceutical/biological industries. Nanofibers have higher capture efficiencies in comparison to microfibers in the submicron particle size range of 100 - 500 nm because of smaller fiber diameter and increased surface area of the fibers. Nanofibers are in the slip flow regime as a consequence of which steep increase in pressure drop is considerably reduced due to slip effect. The economic benefits of using nanofiber filter media are improved filter performance and compact filters. Electrospinning process was used to fabricate polymer and ceramic nanofibers. The electrospun polymer nanofibers were added to the nonwoven fibrous media to improve filter performance for air filtration. This improved filter performance was in consistent with numerical modeling. This book describes the experimental and modeling results of particle loading on fibrous media and application of ceramic nanofibers for hot gas filtration applications.

Author : Bharath Kumar Raghavan
Publisher :
Page : 204 pages
File Size : 43,43 MB
Release : 2010
Category : Air filters
ISBN :

GET BOOK

Nanofibers have higher capture efficiencies in comparison to microfibers in the submicron particle size range of 100-500 nm because of small fiber diameter and increased surface area of the fibers. Pressure drop across the filter increases tremendously with decrease in fiber diameter in the continuum flow regime. Nanofibers with fiber diameter less than 300 nm are in the slip flow regime as a consequence of which steep increase in pressure drop is considerably reduced due to slip effect. The outlet or inlet gases have broad range of particle size distribution varying from few micrometers to nanometers. The economic benefits include capture of a wide range of particle sizes in the gas streams using compact filters composed of nanofibers and microfibers. Electrospinning technique was used to successfully fabricate polymeric and ceramic nanofibers. The nanofibers were long, continuous, and flexible with diameters in the range of 200-300 nm. Nanofibers were added to the filter medium either by mixing microfibers and nanofibers or by directly electrospinning nanofibers as thin layer on the surface of the microfiber filter medium. Experimental results showed that either by mixing Nylon 6 nanofibers with B glass fibers or by electrospinning Nylon 6 nanofibers as a thin layer on the surface of the microfiber medium in the surface area ratio of 1 which is 0.06 g of nanofibers for 2 g of microfibers performed better than microfiber filter media in air filtration tests. This improved performance is consistent with numerical modeling The particle loading on a microfibrous filter were studied for air filtration tests . The experimental and modeling results showed that both pressure drop and capture efficiency increased with loading time. Nanofiber filter media has potential applications in many filtration applications and one of them being hot gas filtration. Ceramic nanofibers made of alumina and titania nanofibers can withstand in the range of 1000°C. Ceramic nanofibers filter media were fabricated by mixing alumina microfibers (SAFFIL) and alumina nanofibers. The appropriate binders were tested for ceramic filter media. The ceramic filter media were tested for aerosol filtration.

Author : Sneha Swaminathan
Publisher : LAP Lambert Academic Publishing
Page : 184 pages
File Size : 43,5 MB
Release : 2013
Category :
ISBN : 9783659270307

GET BOOK

For environmental protection, the suppression of automotive exhausts such as nitrogen oxides and carbon monoxide is very important. These gases are potential health hazards and green house gases. Hence this concern triggered the need for stringent environmental regulations which resulted in the introduction of catalytic devices in automobiles. In this book, a novel approach has been developed wherein the noble metal nanocatalysts have been incorporated on ceramic nanofibers by the electrospinning process. The catalysts on ceramic nanofibers increase the overall exposed catalyst area and simultaneously immobilize the catalyst to minimize catalyst loss. A small amount of the catalyst incorporated into ceramic nanofibers was mixed with microfibers to fabricate a filter disk by vacuum molding. This filter disk termed as 'catalytic filter'is a combination of catalytic elements and filter. The catalyzed ceramic nanofiber augmented microfiber filter media can be used for two applications: reduction of NOx and oxidation of CO and for enhanced particulate removal.

Author : Irwin M. Hutten
Publisher : Elsevier
Page : 510 pages
File Size : 22,14 MB
Release : 2007-03-23
Category : Science
ISBN : 9781856174411

GET BOOK

Preface; Introduction; Processes for Forming Nonwoven Filter Media; Raw Materials for Nonwoven Filter Media; Types of Filters Using Nonwovens; Applications for Nonwoven Filters; Test Methods for Nonwoven Filter Media; Standards for Nonwoven Media; Glossary; Index; Appendix.

Author : Irwin M. Hutten
Publisher : Butterworth-Heinemann
Page : 678 pages
File Size : 46,17 MB
Release : 2015-10-24
Category : Technology & Engineering
ISBN : 0080983022

GET BOOK

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

Author : Mangala Joshi
Publisher : CRC Press
Page : 545 pages
File Size : 11,61 MB
Release : 2020-05-13
Category : Science
ISBN : 1000091090

GET BOOK

In recent times, polymer nanocomposites have attracted a great deal of scientific interest due to their unique advantages over conventional plastic materials, such as superior strength, modulus, thermal stability, thermal and electrical conductivity, and gas barrier. They are finding real and fast-growing applications in wide-ranging fields such as automotive, aerospace, electronics, packaging, and sports. This book focuses on the development of polymer nanocomposites as an advanced material for textile applications, such as fibers, coatings, and nanofibers. It compiles and details cutting-edge research in the science and nanotechnology of textiles with special reference to polymer nanocomposites in the form of invited chapters from scientists and subject experts from various institutes from all over the world. They include authors who are actively involved in the research and development of polymer nanocomposites with a wide range of functions—including antimicrobial, flame-retardant, gas barrier, shape memory, sensor, and energy-scavenging—as well as medical applications, such as tissue engineering and wound dressings, to create a new range of smart and intelligent textiles. Edited by Mangala Joshi, a prominent nanotechnology researcher at the premier Indian Institute of Technology, Delhi, India, this book will appeal to anyone involved in nanotechnology, nanocomposites, advanced materials, polymers, fibers and textiles, and technical textiles.

Author : Shagufta Patel
Publisher : LAP Lambert Academic Publishing
Page : 260 pages
File Size : 23,99 MB
Release : 2013
Category :
ISBN : 9783659383007

GET BOOK

Coalescing filters are effective in removal of aerosols from gas and air streams in many industrial applications. Performance of filters is critically important to improve economy and reliability of process and to protect our environment and health. In coalescing filters captured liquid drains under the influence of gravity. The saturation or liquid hold-up in the filter constricts the flow, increases pressure drop, limits the filter life and increases cost of the process. Filter performance can be enhanced by improving liquid saturation and capture efficiency. To improve filter performance and study the effect of gravity; filter geometries are developed and tested in horizontal and vertical orientation by incorporating woven and nonwoven drainage structures with varying pore structures, basis weight, surface energy and material along with nanofibers in some cases. The drainage channels create a path of lower resistance by allowing maximum flow through the drainage channels which reduces saturation and pressure drop and improves filter performance and drainage. Experimental results, analysis and multiphase modeling of filter media with drainage channels are described in this book.

Author : Priyavardhana Srinivasan
Publisher :
Page : 0 pages
File Size : 33,92 MB
Release : 2005
Category : Filters and filtration
ISBN :

GET BOOK

"Nanofibers, owing to their ultra small diameters, have high surface areas that are advantageous in fibrous filtration. By augmenting micro glass fiber media with nanofibers, a wide range of micron and sub-micron (0.3 to 0.8 micron) particles can be effectively captured. The primary objective of this research is to model the steady state performance of coalescing filter media made of glass fibers with or without polymer nanofibers and to validate with experimental data. Coalescence filtration involves the capture of small liquid droplets from an air stream. The filter performance can be characterized by the Quality Factor (QF) which accounts for pressure drop and capture efficiency of the media. A model was developed to predict the performance of filter media augmented with varying amounts of nanofibers. The model calculates single fiber capture efficiencies, filter coefficient, pressure drop, outlet particle concentration, and the quality factor (QF) of the fiber media. The model accounts for aerodynamic slip of the gas flow around the nanofibers. The model predicted that as more nanofibers are added to the filter media, the QF increases, reaches a maximum and decreases. Experiments were performed with B-glass fibers and Megasol S50 binder media. Increasing amounts of nanofiber were added and the media were tested in a coalescence filtration set up. The experimental results are in accordance with the model predictions that nanofiber incorporated filter media performs better as compared to media without nanofibers."--Page iii.

Author : Anthony L. Andrady
Publisher : John Wiley & Sons
Page : 436 pages
File Size : 12,29 MB
Release : 2022-04-08
Category : Technology & Engineering
ISBN : 1119267706

GET BOOK

APPLICATIONS OF POLYMER NANOFIBERS Explore a comprehensive review of the practical experimental and technological details of polymer nanofibers with a leading new resource Applications of Polymer Nanofibers delivers a complete introduction to the basic science of polymer nanofibers as well as a review of their diverse applications. The book assesses their potential for commercialization and presents contributions from leading experts emphasizing their practical and technological details. New and up to date research findings are presented throughout the book in areas including filters, fabric, energy, fuel cells, batteries, sensors, biomedicine, drug delivery, tissue engineering, and wound dressings. The book also presents a fulsome analysis of the technology of electrospinning, the most convenient and scalable technique for nanofiber production. It also provides readers with practical information on relevant surface modification techniques. Applications of Polymer Nanofibers effectively balances theoretical background with practical applications of the technology, including insights into polymer nanofiber materials that will be useful for advanced students and researchers. Students, researchers, and industry professionals will also enjoy the inclusion of: A thorough introduction to electrospinning parameters and resulting nanofiber characteristics, including theoretical and practical considerations An exploration of textile applications of nanofibers, like protective clothing, filter fabrics, wearable devices, functional fabrics, and biomedical textiles A review of nanofiber mats as high-efficiency filters, including filtration developments, filters made with nanofibers, and the future outlook for nanofiber filters A treatment of nanofiber-based chemical sensors, including sensor materials, approaches to nanofiber sensor design, and gravimetric nanofiber sensors Perfect for researchers and graduate students studying polymer science and engineering, chemical engineering, materials science, and nanotechnology. Applications of Polymer Nanofibers will also earn a place in the libraries of industrial researchers concerned with electrospinning, air filtration, fabrics, drug delivery, catalysis, and biomedicine.

Author : Agasthiyaraj L
Publisher : Mohammed Abdul Sattar
Page : 0 pages
File Size : 17,84 MB
Release : 2024-02-13
Category : Nature
ISBN :

GET BOOK

Human health is harmed by both brief and prolonged period exposure to PM2.5 pollution. Particulate Matter (PM) is commonly divided into two groups, PM2.5 is particles with an aerodynamic diameter lower than 2.5 μm, and if the particles' aerodynamic diameter is between 2.5 to 10 μm then it is PM10. PM2.5 particles are generated by different man-made and natural sources such as vehicular emissions, industrial emissions, power generation emissions, cooking, house cleaning, forest fire, volcano eruption etc. Especially, PM2.5 particles are critically dangerous particles which is capable to interpenetrate into human lungs and bronchi; which causes respiratory diseases like cardiovascular disease, stroke, chronic bronchitis, asthma etc., to human beings. Thus one-third of the effects of PM2.5 pollution is associated with lung cancer, stroke, and chronic vascular disease. Majority of the particulate pollutants consist of organic compounds, such as carbon-derived compounds and also nitrogen and sulfur-based inorganic compounds. Some other sort of primary pollutant is bio-aerosols, which include bacteria, viruses, and fungi. Because they are easily spread by contaminated air, this significantly enhances the risk to human health. These biological pollutants will induce toxigenic, allergic, infectious, and other disorders in both chronic and acute forms. To protect humans from PM2.5 pollution filtration of the air is the best preservation. Resultantly, interest in high-proficiency air filtration technologies which could collect dangerous particles, toxic gases and biological contaminants all at the same time is growing. Also, these high-efficiency air filter media with different multi functionalities that can work in various temperature and humidity conditions for real-time applications is gathering a lot of attention in the past few years.