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Etude De La Filtration Des Aerosols Par Des Filtres A Fibres
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Book Synopsis La filtration des aérosols by : Dominique Thomas
Download or read book La filtration des aérosols written by Dominique Thomas and published by ISTE Group. This book was released on 2018-06-01 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: La collecte de particules au sein d’un média filtrant n’est pas, contrairement à la croyance générale, liée à un simple effet tamis. Les phénomènes mis en jeu sont beaucoup plus complexes et nécessitent de prendre en considération les interactions aérosols-médias filtrants et les conditions opératoires afin de choisir le meilleur filtre à fibres pour une application donnée. La filtration des aérosols présente tout d’abord les éléments essentiels pour une meilleure compréhension du comportement des particules au sein du média fibreux ainsi que les différentes techniques d’élaboration des médias filtrants et leur caractérisation. Les chapitres suivants analysent les performances initiales des médias fibreux, à savoir la perte de charge qui conditionne la dépense énergétique et l’efficacité de filtration. Enfin, deux chapitres fournissent des réponses aux utilisateurs pour lesquels l’évolution des performances des filtres au cours du temps et par conséquent leur durée de vie restent une donnée importante.
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 Nanoethics and Nanotoxicology by : Philippe Houdy
Download or read book Nanoethics and Nanotoxicology written by Philippe Houdy and published by Springer Science & Business Media. This book was released on 2011-09-13 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanobiotechnology is a fast developing field of research and application in many domains such as in medicine, pharmacy, cosmetics and agro-industry. The book addresses the lastest fundamental results on nanotoxicology and nanoethics, and the enormous range of potential applications in the fields of medical diagnostics, nanomedicine, and food and water administration. Nanoscale objects have properties leading to specific kinds of behaviour, sometimes exacerbating their chemical reactivity, physical behaviour, or potential to penetrate deeply within living organisms. Hence it is important to ensure the responsible and safe development of nanomaterials and nanotechnologies. This fourth volume in the Nanoscience series should make its mark, by presenting the state of the art in the fields of nanotoxicology and nanoethics. This is the first book to combine both scientific knowledge and ethical and social recommendations. It also presents specific policies on nanotechnologies set up by national and international authorities. This book is of interest to engineers, researchers, and graduate students.
Book Synopsis Une nouvelle approche expérimentale de la mesure de l'éfficacité des filtres à fibres à basse pression by : Michel Attoui
Download or read book Une nouvelle approche expérimentale de la mesure de l'éfficacité des filtres à fibres à basse pression written by Michel Attoui and published by . This book was released on 1994 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: THEORIQUEMENT, LA PERMEANCE D'UN FILTRE A FIBRES DIMINUE QUAND LA PRESSION DIMINUE. CEPENDANT, PEU D'ETUDES EXPERIMENTALES ONT ETE MENE POUR VERIFIER CETTE THEORIE. NOTRE TRAVAIL A POUR OBJECTIF LA MESURE DE LA PERMEANCE D'UN FILTRE A FIBRES JUSQU'A DES PRESSIONS DE L'ORDRE DE 10HPA, DE FACON A FAIRE DES COMPARAISONS AVEC LES RESULTATS THEORIQUES. APRES UNE SYNTHESE BIBLIOGRAPHIQUE DES CONNAISSANCES ACTUELLES SUR LA FILTRATION, NOUS ADAPTONS AUX BASSES PRESSIONS LE MODELE THEORIQUE LE PLUS EVOLUE, LE MODELE DE S. PAYET. DANS LA SECONDE PARTIE NOUS DEVELOPPONS UNE METHODOLOGIE ORIGINALE DE MESURE EXPERIMENTALE DE LA PERMEANCE D'UN FILTRE QUI NOUS PERMET DE CONTOURNER LES PROBLEMES DE METROLOGIE DES AEROSOLS AUX BASSES PRESSIONS. A CET EFFET, NOUS AVONS REALISE UN BANC DE TESTS COMPLET ADAPTE A CES PROBLEMES. NOUS VALIDONS NOTRE METHODE EN COMPARANT SES RESULTATS A CEUX DONNES PAR LA METHODE CLASSIQUE SOUS LA PRESSION ATMOSPHERIQUE. A PARTIR DE CELA, IL NOUS EST POSSIBLE DE METTRE EN EVIDENCE LA DIMINUTION DE LA PERMEANCE (DONC L'AUGMENTATION DE L'EFFICACITE) DE FILTRES FORMETTES POUR SIX DIAMETRES D'AEROSOLS DE DOP ALLANT DE 4 10-2 MICROMETRES A 0,3 MICROMETRE POUR DES VITESSES DE FILTRATION COMPRISES ENTRE 2CM/S ET 40CM/S. NOUS MONTRONS QUE NOS RESULTATS EXPERIMENTAUX S'ACCORDENT BIEN A NOTRE THEORIE JUSQU'A 50HPA
Book Synopsis Advances in Aerosol Gas Filtration by : Kvetoslav R. Spurny
Download or read book Advances in Aerosol Gas Filtration written by Kvetoslav R. Spurny and published by CRC Press. This book was released on 1998-03-27 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosols are generally associated with damaging effects to the ozone and human health, however, some aerosols enable productions of very clean, highly dispersed materials. Advances in Aerosol Filtration is dedicated to progress in aerosol science, presenting newly developed theories, filtration models, and novel applications of aerosol gas filtration. Topics include new filtration materials, filter testing methods, electrically enhanced filtration, mechanical and chemical filter resistivity, computational models, and much more. This book examines the history and development of aerosol filtration science and also considers research needs for the future.
Book Synopsis Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration by : Benjamin James Mullins
Download or read book Study of Capture, Fibre Wetting and Flow Processes in Wet Filtration and Liquid Aerosol Filtration written by Benjamin James Mullins and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: This thesis examines the particle capture, fibre wetting and droplet flow processes within wet filters collecting solid and liquid aerosols and within filters collecting only liquid aerosols. The processes involved in this type of filtration were examined through a series of experiments and models developed to describe the behaviour of fibre/liquid systems. -- This work can be summarized in 4 categories: (1) The bounce and immediate re-entrainment of liquid and solid monodisperse aerosols under a stable filtration regime (pre cake formation) by wet and dry fibrous filters. In this work it was found that the solid particles generally exhibited a lower fractional filtration efficiency than liquid particles (of the same size), although this difference decreased in the smaller size fractions. However, for the wet filtration regime (each fibre of the filter was coated by a film of water), no significant difference in filtration efficiency was detectable between solid and liquid aerosols. Either the bounce effect of the particles is inhibited by the liquid film, or the filtration conditions in the wet filter are so different that the aerosol properties are less significant with respect to capture. (2) A microscopic study of the effect of fibre orientation on the fibre wetting process and flow of liquid droplets along filter fibres when subjected to airflow and gravity forces was conducted. The flow of the liquid collected by the fibres was observed and measured using a specially developed micro-cell, detailed in the thesis. The experimental results were compared to a theoretical model developed to describe the flow of droplets on fibres. The theory and experimental results showed a good agreement. A sensitivity analysis of the model was performed which showed the droplet radius to be the most significant parameter. The model has the potential to improve filter self-cleaning and minimise water use. (3) An experimental study of the capture of solid and liquid (oil) aerosols on fibrous filters wetted with water. Variable quantities of liquid irrigation were used, and the possibility for subsequent fibre regeneration after clogging or drying was also studied. It was found that self-cleaning (removal of solid aerosols by water) occurred even under heavily dust-laden conditions, and post evaporation of water. With the collection of oil aerosols on fibres wetted with water, a predominance of the barrel shaped droplet on the fibre was observed, with oil droplets displacing water droplets (if the oil and fibre combination created a barrel shaped droplet), creating various compound droplets of oil and water not previously reported in literature. (4) An extensive experimental investigation of the wetting processes of fibre/liquid systems during air filtration (when drag and gravitational forces are acting) has shown many important features, including droplet extension, oscillatory motion, and detachment from fibres as airflow velocity increases. The droplet oscillation is believed to be induced by the onset of the transition from laminar to turbulent flow as droplet size increases. To model such oscillation it was necessary to create a new conceptual model to account for the forces both inducing and preventing such oscillation. The agreement between the model and experimental results is satisfactory for both the radial and transverse oscillations.
Book Synopsis Studies on Filtration of Monodisperse Aerosols by : Victor Kuhn La Mer
Download or read book Studies on Filtration of Monodisperse Aerosols written by Victor Kuhn La Mer and published by . This book was released on 1951 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Filtration of Radioactive Aerosols by Glass Fibers: Appendices by :
Download or read book Filtration of Radioactive Aerosols by Glass Fibers: Appendices written by and published by . This book was released on 1951 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude du comportement des aérosols microbiens dans les filtres des réseaux de ventilation du bâtiment by : Jean-Christophe Bonnevie-Perrier
Download or read book Étude du comportement des aérosols microbiens dans les filtres des réseaux de ventilation du bâtiment written by Jean-Christophe Bonnevie-Perrier and published by . This book was released on 2008 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail propose d'évaluer le risque de croissance des microorganismes collectés sur un média fibreux filtrant et les conséquences d'un développement microbien sur les propriétés aérodynamiques du filtre et la qualité de l'air filtré. L'étude de laboratoire a consisté à réaliser la croissance d'espèces fongiques sur différents médias fibreux filtrants. Le développement microbien est estimé indirectement par quantification des protéines. Les résultats montrent que la croissance a influencé significativement les propriétés du média, provoquant une diminution de sa perméabilité et une dégradation de la qualité de l'air traité. Cette influence a été fortement dépendante de l'espèce fongique considérée. La résistance des médias à la croissance microbienne a ensuite été testée pour 3 médias fibreux filtrants. Le média composé de fibres de polypropylène s'est montré particulièrement résistant à la croissance fongique. Pour l'étude des médias utilisés en conditions réelles, l'ensemble des filtres de deux centrales de traitement d'air a été prélevé dans le cadre d'une collaboration industrielle. Les résultats montrent que les filtres usagés contenaient de 10 à 1000 microorganismes cultivables par cm2 de média. Les risques de croissance microbienne apparaissant plus importants sur les étages de pré-filtration. Des échantillons placés en conditions humides contrôlées (RH > 90, 25°C) ont subi une croissance importante de leurs populations microbiennes, principalement fongiques (x 10 000 UFC) en 25 jours avec une influence significative sur la perméabilité des médias. La qualité de l'air filtré a été fortement dégradée en cas de développement microbien, notamment car les microorganismes issus du développement se sont avérés être facilement réentraînés.
Book Synopsis A Fundamental Study of Aerosol Filtration by Fibrous Filters in the Transition Flow Regime by : Zhiqun Zhang
Download or read book A Fundamental Study of Aerosol Filtration by Fibrous Filters in the Transition Flow Regime written by Zhiqun Zhang and published by . This book was released on 1989 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ˆA‰ Study on the filtration of aerosols by : Isaiah Gallily
Download or read book ˆA‰ Study on the filtration of aerosols written by Isaiah Gallily and published by . This book was released on 1955 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Epidemic Preparedness and Control by : Márcia Aparecida Sperança
Download or read book Epidemic Preparedness and Control written by Márcia Aparecida Sperança and published by BoD – Books on Demand. This book was released on 2024-05-22 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Epidemics and pandemics caused by infectious diseases, mainly zoonosis, have existed since the beginning of humanity. They affect health, social, economic, and cultural policies around the world. Epidemic Preparedness and Control highlights epidemiology as an important scientific matter of research on the prevention and control of infectious diseases. It also examines different aspects of public health after the emergence of SARS-CoV-2, the etiological agent of COVID-19. The book is organized into six sections addressing general aspects of pandemics and epidemics as a result of climate change, environmental degradation, socio-cultural interactions and occurrence of zoonoses, and the experience of SARS-CoV-2 contributing to different tools for use in COVID-19 epidemics and other airborne infectious diseases.
Book Synopsis Technical Report No. 8 by : William Edwin Ranz
Download or read book Technical Report No. 8 written by William Edwin Ranz and published by . This book was released on 1953 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude de l'évaporation d'aérosols liquides semi-volatils collectés sur médias fibreux by : Benjamin Sutter
Download or read book Étude de l'évaporation d'aérosols liquides semi-volatils collectés sur médias fibreux written by Benjamin Sutter and published by . This book was released on 2009 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude s'inscrit dans le cadre de l'amélioration des connaissances liées à l'évaporation d'aérosols liquides semi-volatils collectés sur des filtres à fibres. Le phénomène d'évaporation d'aérosols collectés sur médias fibreux induit des problèmes de sécurité avec notamment une surexposition des salariés aux vapeurs, à l'aval des systèmes généraux de filtration de l'air. De plus, lors des contrôles des concentrations atmosphériques des aérosols, l'évaporation induit une sous-estimation de la phase particulaire de l'aérosol prélevé qui est problématique en termes de prévention de l'exposition. L'objectif de ces travaux a donc été de produire de nombreux résultats expérimentaux afin, d'une part, de compléter les rares présents dans la littérature et, d'autre part, d'améliorer les modèles théoriques développés précédemment. Deux approches expérimentales ont été menées afin d'identifier le processus d'évaporation d'un aérosol collecté. La première, nommée approche globale, permet de suivre l'évaporation de l'aérosol par la quantification des vapeurs à l'aval du filtre, au cours du temps. La seconde, nommée approche microscopique, étudie l'évaporation de gouttes collectées sur les fibres d'une fibre à l'échelle microscopique. Les deux approches réalisées lors de ces travaux s'accordent sur le fait que l'évaporation d'un aérosol liquide semi-volatil ne peut être modélisée par les modèles proposés par la littérature. Des hypothèses ont été avancées afin d'expliquer la divergence de cinétique d'évaporation entre la théorie et les expérimentations.
Book Synopsis A Fundamental Study of Aerosol Filtration by Fibrous Filters by : Hsu-Chi Yeh
Download or read book A Fundamental Study of Aerosol Filtration by Fibrous Filters written by Hsu-Chi Yeh and published by . This book was released on 1972 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Fundamental Study of Air Filtration for Respiratory Protection by : Behzad Fardi
Download or read book A Fundamental Study of Air Filtration for Respiratory Protection written by Behzad Fardi and published by . This book was released on 1988 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 1er [i.e. Première] Congrès Mondial de la Filtration. 1st World Filtration Congress, Paris, 14-17 Mai 1974 by :
Download or read book 1er [i.e. Première] Congrès Mondial de la Filtration. 1st World Filtration Congress, Paris, 14-17 Mai 1974 written by and published by John Wiley & Sons. This book was released on 1974 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download 1er [i.e. Première] Congrès Mondial de la Filtration. 1st World Filtration Congress, Paris, 14-17 Mai 1974 PDF Online Free](https://books.google.com/books/content/images/frontcover/6s5TAAAAMAAJ?fife=w200-h370)
