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Study Of Liquid Drop Migration On Fibers And Mats Due To Liquid Flow In A Thin Slit Geometry
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Book Synopsis Study of Liquid Drop Migration on Fibers and Mats Due to Liquid Flow in a Thin Slit Geometry by : Jia Fang
Download or read book Study of Liquid Drop Migration on Fibers and Mats Due to Liquid Flow in a Thin Slit Geometry written by Jia Fang and published by . This book was released on 2015 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The movement of liquid drops on fibers and mats commonly occurs in fabrics used in household and commercial applications. Removal of the liquid droplets from the gas/liquid and liquid/liquid streams will be of benefit for the health of the workers, safety of the environment, and protection of equipment. For example, the presence of water in diesel fuel may lead to some problems such as plugging of fuel injectors, reduce fuel flow rate, reduce fuel lubricity, and cause corrosion of engine parts. It is better to design a self-cleaning filter, which could be used to collect the liquid droplets and drain to a collecting device. This filter has advantages of reducing the cleaning cost and extending the filter life. The quality factor is used to evaluate the performance of the filter, which is related to the separation efficiency and pressure drop. The separation efficiency is strongly related to the velocity of drops on the fibers and mats. The drag coefficient correlation is used to estimate the average velocity of drop moving on the fiber/mat surfaces. In this work, the drag coefficient is correlated to Reynolds and capillary numbers from experiments and models. The flow direction is parallel the fibers and mats. In the gas-liquid experiment, the experiments are conducted for different types of fibers and different liquids. In the liquid-liquid experiment, the experiments are conducted for water drop moving on different types of mat surfaces. Also, other correlations have been derived to estimate the minimum gas/liquid flow Reynolds numbers to initiate the drop movement on fiber and mat surfaces. Finally, when the flow direction is through the filter medium (perpendicular to the fiber mat surface), another correlation is derived to estimate the minimum flow rate to move the water droplets through the pores of the mats. These correlations are unique to determine the average velocities of the liquid drops on fiber/mat surfaces. The motion of drops on fibers and woven mats are not widely discussed in literature. Very few papers have been published on the development of such correlations to estimate the drop migration on fibers/mats which makes this work unique.
Book Synopsis Aerosol Droplet Migration in Fibrous Media by : Masoume Davoudi
Download or read book Aerosol Droplet Migration in Fibrous Media written by Masoume Davoudi and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The motions of droplets on fibers are important to many industrial applications. In particular, the movements of drops control the performance of fibrous filters. Fibrous filters are widely used in the petrochemical industries to separate aerosol droplets from air to protect the environment and worker health. The performance of a filter medium depends on factors like fiber size, droplet, face velocity, liquid properties and gas conditions. In the operation of a fibrous filter, the droplets carried by a flowing gas are captured by the filter medium due to collisions with the fibers of the medium. Liquid droplets can deform when forces are applied and, when captured on fibers, the droplets can spread over the fiber surface, coalesce into larger drops, and can migrate within the filter as drops or as a flowing film. The movements of the drops on the fibers after they are captured require study to develop theory, correlations, and data to validate models. The overall goal of this dissertation work is to develop new generalized theory for design and manufacture of gas-liquid separation media by developing correlations for gas flow conditions and movements of liquid drops in fibrous media. These relationships will enable the design and development of the next generation of fibrous filtration/separation media with superior performance.There are four experimental tasks to achieve this goal. Experiments on droplet interactions with single fibers, crossing fibers, thin and thick mats. These experiments were conducted to study the shape and migration of drops on fibers and provide fundamental understanding and insight as to how drops attach to, move on and detach from fibers. Different liquids with different drop sizes were tested that give a range of contact angles on the fibers. Different fiber materials with different fiber diameters were evaluated that give a range of surface properties. The liquids, fibers materials and sizes, and droplet sizes were selected as those currently of interest to the filter testing community.
Book Synopsis Microscale Study of Drop Migration on Fibers in Coalescing Filters by : Saru Dawar
Download or read book Microscale Study of Drop Migration on Fibers in Coalescing Filters written by Saru Dawar and published by . This book was released on 2007 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The micro scale study of drop motion on fibers is significant to many industrial applications such as drop coalescence and drainage in fibrous filter media. Removal of the liquid droplets from the exhaust streams of many chemical, automotive, aeronautics, textile and health and safety industries is of vital importance. These droplets can lead to clogging of the fibrous filters during the cleaning operation. It is significant to design a self cleaning filter, whereby the liquid droplets collect on the filter and drain down onto some collecting device. This reduces the operational and cleaning cost of the filter. The underlying need for all these applications is estimation of the velocity of a drop along the fiber axis. This can be done by defining and determining the drag coefficient correlation. In this work, the drag coefficient is correlated to Reynolds and capillary numbers from experiments and models with the axial and transverse air flow conditions. The experiments are conducted for different types of fibers and using acoustic fields. Correlations to predict the probability of the motion of the drops on fibers are also developed considering the effect of acoustic fields. These correlations are unique approach to determine the velocities of the liquid drops on fibers for different fiber orientations. Very little has been published on the development of such correlations to predict drop migration on fibers which makes this work unique."--Abstract.
Book Synopsis Fluid Transport Phenomena in Fibrous Materials by : N. Pan
Download or read book Fluid Transport Phenomena in Fibrous Materials written by N. Pan and published by Woodhead Pub Limited. This book was released on 2006 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Textile Progress monograph series provides a critical and comprehensive examination of the origination and application of developments in the textile industry and its products. This issue reviews recent developments in the understanding of the fundamentals of liquid transport phenomena in fibrous materials, and deals with a wide range of issues, many of which are complex and thus still inadequately understood.
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Book Synopsis Electrospun Nanofibers by : Mehdi Afshari
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