Honors Theses (Physics)

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    Three-dimensional fractals
    (2001) Jacob, Kenneth Baba
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    Self-propelled motion of film boiling droplets on ratchet-like surfaces
    (University of Oregon, 2003-06) Melling, Laura
    We have observed a novel phenomenon by which asymmetrically structured surfaces can be used to direct the motion of film boiling droplets without applying an external force to the system. Droplets placed on such a surface move in a preferred direction, and under common conditions accelerate in that direction. In this thesis, we present a phenomenological description of the observed behavior, and develop a mathematical model for the motion of droplets on ratchet and non-ratchet surfaces. Using this model, we show that asymmetry is a requisite of the observed behavior. We also show that surface and droplet properties influence the resulting acceleration.
  • ItemOpen Access
    Leidenfrost Ratchets
    (2006-07-07T13:08:56Z) Taormina, Michael James
    A “Leidenfrost ratchet” is a device which facilitates a newly-discovered phenomenon, where drops of liquid accelerate across a heated substrate. The system has been qualitatively studied and a vapor flow model has been suggested to account for this observed behavior. This paper provides a study of general behavior, considerations needed to apply and test a vapor flow model for the ratchet system, and submits the model to an experimental trial. The results show the quantitative validity of a vapor flow model, while exposing subtle qualitative inconsistencies for the behavior of water and ethanol droplets. Content of the study can be used as a starting point for more detailed analysis of the system, possibly leading to novel scientific and industrial applications.