The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

Yasushi Mino - One of the best experts on this subject based on the ideXlab platform.

  • lattice boltzmann flow simulation of an oil in water emulsion through a Coalescing Filter effects of Filter structure
    Chemical Engineering Science, 2018
    Co-Authors: Yasushi Mino, Ayano Hasegawa, Hiroyuki Shinto, Hideto Matsuyama
    Abstract:

    Abstract The permeation of an oil-in-water (O/W) emulsion through a Coalescing Filter was numerically studied using the lattice Boltzmann method (LBM). A numerical simulation model for the Coalescing phenomena was developed based on the free-energy LBM. We investigated the effects of the wettability of fibers, Filter porosity, and fiber diameter on the Coalescing behaviors by performing two-dimensional permeation simulations for the O/W emulsions through modeled fibrous Filters. We mainly focused on hydrophilic Filters because they did not generate small secondary droplets during oil droplet detachment from the Filter, and this is preferred for precise separation of oil and water. Our simulations demonstrated that Filters with larger pore spacings enable formation of larger droplets but allow more droplets to pass without Coalescing. To solve this problem, we designed bi-layered Filters composed of a small-pore Filter to accurately catch the droplets and a large-pore Filter to enlarge the droplets; we demonstrated the effectiveness of the bilayer structure for membrane coalescence.

  • permeation of oil in water emulsions through Coalescing Filter two dimensional simulation based on phase field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

  • Permeation of oil‐in‐water emulsions through Coalescing Filter: Two‐dimensional simulation based on phase‐field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

Hideto Matsuyama - One of the best experts on this subject based on the ideXlab platform.

  • lattice boltzmann flow simulation of an oil in water emulsion through a Coalescing Filter effects of Filter structure
    Chemical Engineering Science, 2018
    Co-Authors: Yasushi Mino, Ayano Hasegawa, Hiroyuki Shinto, Hideto Matsuyama
    Abstract:

    Abstract The permeation of an oil-in-water (O/W) emulsion through a Coalescing Filter was numerically studied using the lattice Boltzmann method (LBM). A numerical simulation model for the Coalescing phenomena was developed based on the free-energy LBM. We investigated the effects of the wettability of fibers, Filter porosity, and fiber diameter on the Coalescing behaviors by performing two-dimensional permeation simulations for the O/W emulsions through modeled fibrous Filters. We mainly focused on hydrophilic Filters because they did not generate small secondary droplets during oil droplet detachment from the Filter, and this is preferred for precise separation of oil and water. Our simulations demonstrated that Filters with larger pore spacings enable formation of larger droplets but allow more droplets to pass without Coalescing. To solve this problem, we designed bi-layered Filters composed of a small-pore Filter to accurately catch the droplets and a large-pore Filter to enlarge the droplets; we demonstrated the effectiveness of the bilayer structure for membrane coalescence.

  • permeation of oil in water emulsions through Coalescing Filter two dimensional simulation based on phase field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

  • Permeation of oil‐in‐water emulsions through Coalescing Filter: Two‐dimensional simulation based on phase‐field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

Toru Ishigami - One of the best experts on this subject based on the ideXlab platform.

  • permeation of oil in water emulsions through Coalescing Filter two dimensional simulation based on phase field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

  • Permeation of oil‐in‐water emulsions through Coalescing Filter: Two‐dimensional simulation based on phase‐field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

George G Chase - One of the best experts on this subject based on the ideXlab platform.

  • Effect of pore size and wettability of multilayered Coalescing Filters on water-in-ULSD coalescence
    Separation and Purification Technology, 2019
    Co-Authors: Ashish D. Gadhave, S. Neda Mehdizadeh, George G Chase
    Abstract:

    Abstract Coalescing Filters are generally used to increase the size of the small drops for their separation from gases and liquids. Many studies have been performed on Coalescing Filter media. The performances become much more complicated for multilayered media having different properties and systematic studies are needed. Wettability, pore size, face velocity and wetting properties are among the important factors controlling performance. In this work, microscopic studies were performed to visually observe coalescence of water droplets on hydrophilic Nylon and hydrophobic Polypropylene woven sheets in a water-in-diesel emulsion at different face velocities and spacings between the sheets. The combination of hydrophobic sheet followed by hydrophilic sheet had the best performance. Statistical analysis of variance showed that the variations of distance between sheets and the face velocity were not significant factors. To better understand the effects of multilayers in Filter performance, pilot scale experiments of stacked layers of woven sheet media of different thicknesses and wetting properties were conducted. Thin media had poor performance, but the performance improved and reached a plateau as the thickness increased. Effects of fiber surface wettability and pore size variations in the layers were also evaluated. Similar to microscope results, the coalescence performance was better for dual layer media with different wetting properties of each layer compared to dual layer media having the same wetting properties of each layer. The pore size was a dominant parameter affecting the performance. When pore size was similar to the average drop size of the water in the upstream, the best performance was observed. For dual layer Filters having one layer of small pores and the other of large pores, the observed performance was lower than that of dual layer Filters having only large pores but higher than the Filters having only small pores.

  • Nanofibers for Coalescing Filter media for water–diesel separation
    Fibrous Filter Media, 2017
    Co-Authors: Xi Yang, George G Chase
    Abstract:

    Electrospun fibers have potential for use in many applications such as Filter media. The small fiber diameters enhance Filter capture efficiency for small particles. The small pores associated with the electrospun fibers enhance the hydrophobic properties the fiber mats and make them suitable as a barrier medium for separation of water drops from diesel fuel. Discussed here are the separation mechanisms of barrier media in contrast to depth media. An overview of electrospinning is provided. Performances of depth media and electrospun barrier media are compared. Experimental results show the barrier medium performed significantly better than the depth medium.

  • nanofibers for Coalescing Filter media for water diesel separation
    Fibrous Filter Media, 2017
    Co-Authors: Xi Yang, George G Chase
    Abstract:

    Electrospun fibers have potential for use in many applications such as Filter media. The small fiber diameters enhance Filter capture efficiency for small particles. The small pores associated with the electrospun fibers enhance the hydrophobic properties the fiber mats and make them suitable as a barrier medium for separation of water drops from diesel fuel. Discussed here are the separation mechanisms of barrier media in contrast to depth media. An overview of electrospinning is provided. Performances of depth media and electrospun barrier media are compared. Experimental results show the barrier medium performed significantly better than the depth medium.

  • Thickness shrinkage of microfiber media in gas–liquid coalescence filtration
    Separation and Purification Technology, 2015
    Co-Authors: Y. Wu, Gabriel M. Manzo, George G Chase
    Abstract:

    Abstract The performance of gas–liquid Coalescing Filter media depends on material properties and operating conditions. To optimize the Filter performance, highly porous Filter media are fabricated with micron-sized fibers with diameters typically in the range of about 5–20 μm. In recent experiments with fiber diameters less than 5 μm the thicknesses of the media were observed to decrease as the amount of liquid held in the media increased. This paper reports on empirical measurements of the shrinkage of the media due to the presence of the liquid drops. This shrinkage phenomenon is attributed to capillary forces compressing the media primarily in the thickness dimension. The shrinkage depends upon the fiber diameter and the wetting properties of the fiber surfaces. The shrinkage caused variations in media properties (pore size, porosity, and permeability) and affected the coalescence performances of the media. The objective of this work was to measure the shrinkage, the effect of the thickness shrinkage on the media properties, and the effect on Coalescing Filter performance. Experiments were conducted on two media materials (glass fibers and stainless steel fibers) with fiber diameters ranging from 1.5 μm to 22 μm wetted by three organic liquids (Sullube-32, Ultra Low Sulfur Diesel and Viscor 1487) and by water. The results show the shrinkage phenomenon varied with amount of liquid in the media and the fiber material. The effects of shrinkage on the Filter properties and coalescence performance were compared to mechanically compressed media to similar thickness. The mechanically compressed media had higher pressure drops but also higher separation efficiencies.

  • glass fiber Coalescing Filter media augmented with polymeric submicron fibers and modified with angled drainage channels
    Separation and Purification Technology, 2013
    Co-Authors: Shagufta U Patel, Prashant S. Kulkarni, George G Chase
    Abstract:

    Abstract Glass fiber Filter media are widely used in separation of droplets from liquid aerosols. In prior works two possible enhancements to the performance of the glass fiber media were studied: (1) the capture efficiencies were increased by augmenting the glass fibers with sub-micron sized electrospun polymer fibers, and (2) the pressure drop was decreased by modifying the Filter media with insertion of 45° drainage channels. In this paper we report the simultaneous application of these two enhancements on the performance of the Filter media. Filters were fabricated by inserting low surface energy woven polymer fiber drainage channels at various angles within non-woven glass fiber Filter media augmented with Nylon sub-micron fibers. The effects of the presence and geometry of the drainage channels on the Filter performance were evaluated experimentally. The sub-micron fibers gave the Filter high coalescence and separation efficiencies while the drainage channels reduced the Filter pressure drop. The micro glass fiber media augmented with 100 nm Nylon fibers and modified with Polypropylene fiber drainage channels at 45° downward angles had the overall best performance.

Yusuke Kagawa - One of the best experts on this subject based on the ideXlab platform.

  • permeation of oil in water emulsions through Coalescing Filter two dimensional simulation based on phase field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016

  • Permeation of oil‐in‐water emulsions through Coalescing Filter: Two‐dimensional simulation based on phase‐field model
    Aiche Journal, 2016
    Co-Authors: Yasushi Mino, Yusuke Kagawa, Hideto Matsuyama, Toru Ishigami
    Abstract:

    The permeation of an oil-in-water emulsion through a Coalescing Filter is studied numerically. Our simulation model is based on the phase-field model owing to its simple description of the wetting behavior of oil droplets on versatile surfaces. To realize two-dimensional (2D) simulations of the Coalescing processes, we construct a 2D Filter model which describes the cross-sectional structure of a fibrous Filter in a simple manner. We investigate the effects of wettability, permeation flux, and fiber diameter on Coalescing behavior. Oil droplets attach to the fibers and coalesce with each other, forming a bridging structure between fibers which promotes droplet coalescence unless the bridging structure blocks the entire flow path. This coalescence-promoting effect of the bridging structure is observed under conditions where the fluid velocity inside a pore is relatively large. We demonstrate that our numerical model provides useful information to effectively design a Coalescing Filter and process. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2525–2532, 2016