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    A Computational Study of Internal Flows in a Heated Water-Oil Emulsion Droplet

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    Type
    Conference Paper
    Authors
    Sim, Jaeheon cc
    Im, Hong G. cc
    Chung, Suk Ho cc
    KAUST Department
    Clean Combustion Research Center
    Combustion and Laser Diagnostics Laboratory
    Computational Reacting Flow Laboratory (CRFL)
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2015-01-03
    Online Publication Date
    2015-01-03
    Print Publication Date
    2015-01-05
    Permanent link to this record
    http://hdl.handle.net/10754/593296
    
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    Abstract
    The vaporization characteristics of water-oil emulsion droplets are investigated by high fidelity computational simulations. One of the key objectives is to identify the physical mechanism for the experimentally observed behavior that the component in the dispersed micro-droplets always vaporizes first, for both oil-in-water and water-in-oil emulsion droplets. The mechanism of this phenomenon has not been clearly understood. In this study, an Eulerian-Lagrangian method was implemented with a temperature-dependent surface tension model and a dynamic adaptive mesh refinement in order to effectively capture the thermo-capillary effect of a micro-droplet in an emulsion droplet efficiently. It is found that the temperature difference in an emulsion droplet creates a surface tension gradient along the micro-droplet surface, inducing surface movement. Subsequently, the outer shear flow and internal flow circulation inside the droplet, referred to as the Marangoni convection, are created. The present study confirms that the Marangoni effect can be sufficiently large to drive the micro-droplets to the emulsion droplet surface at higher temperature, for both water-in-oil and oil-and-water emulsion droplets. A further parametric study with different micro-droplet sizes and temperature gradients demonstrates that larger micro-droplets move faster with larger temperature gradient. The oil micro-droplet in oil-in-water emulsion droplets moves faster due to large temperature gradients by smaller thermal conductivity.
    Citation
    Sim, J., Im, H. G., & Chung, S. H. (2015). A Computational Study of Internal Flows in a Heated Water-Oil Emulsion Droplet. 53rd AIAA Aerospace Sciences Meeting. doi:10.2514/6.2015-0423
    Publisher
    American Institute of Aeronautics and Astronautics (AIAA)
    Journal
    53rd AIAA Aerospace Sciences Meeting
    Conference/Event name
    53rd AIAA Aerospace Sciences Meeting
    DOI
    10.2514/6.2015-0423
    Additional Links
    http://arc.aiaa.org/doi/abs/10.2514/6.2015-0423
    ae974a485f413a2113503eed53cd6c53
    10.2514/6.2015-0423
    Scopus Count
    Collections
    Conference Papers; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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