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Aerosol Droplet Migration in Fibrous Media

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, Doctor of Philosophy, University of Akron, Chemical Engineering.
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.
George Chase (Advisor)

Recommended Citations

Citations

  • Davoudi, M. (n.d.). Aerosol Droplet Migration in Fibrous Media [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509120181801687

    APA Style (7th edition)

  • Davoudi, Masoume. Aerosol Droplet Migration in Fibrous Media. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1509120181801687.

    MLA Style (8th edition)

  • Davoudi, Masoume. "Aerosol Droplet Migration in Fibrous Media." Doctoral dissertation, University of Akron. Accessed MARCH 28, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=akron1509120181801687

    Chicago Manual of Style (17th edition)