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    Computational studies of droplet motion and deformation in a microfluidic channel with a constriction

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    No. of downloads: 1188

    Date
    2010
    Author
    Lee, Moon Soo
    Advisor
    Dimitrakopoulos, Panagiotis
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    Abstract
    In the present thesis, we investigate the interfacial dynamics of a three-dimensional droplet in a viscous fluid flowing through a square microfluidic channel with a rectangular cross-sectional constriction. The effects of various parameters of the two fluids and the sizes of the constriction geometry are considered. The numerical computation for the current problem requires a highly-accurate and efficient method owing to the very small/large deformation of the droplet shape at low/high flow rates, the small droplet-solid gap and the complicated three-dimensional geometries. An efficient fully-implicit three-dimensional Spectral Boundary Element method developed by Dimitrakopoulos is employed. Our results show that the droplet dynamics is significantly influenced by the non-symmetric shape of the rectangular cross-sectional constriction, i.e. owing to the constriction shape the droplet deforms much less in the flow-direction by forming a flat disk shape. As the capillary number is decreased, the droplet deformation in the flow-direction decreases owing to the larger surface tension. The effects of the viscosity ratio are complicated with viscosity ratio near unity showing the largest deformation.
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    http://hdl.handle.net/1903/10251
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    • Chemical and Biomolecular Engineering Theses and Dissertations
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    DRUM is brought to you by the University of Maryland Libraries
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