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  • Experimental Investigation of Near-Critical Carbon Dioxide in Microchannels for High Flux Cooling Applications

    Creator:
    Travers, Kristen
    Abstract:
    With the continued decrease in size and subsequent increase in power of computer processors, thermal management in electronics is becoming more important than ever before. The chip heat densities are reaching new peaks (> 100 W cm-2) that current cooling methods are not able to keep up with. However, some...
    Resource Type:
    Honors College Thesis
    Full Text:
    _____________________________________________________________________ Deborah V. Pence, Committee Member, representing Mechanical Engineering

  • Submerged jet impingement boiling thermal management

    Creator:
    Cardenas, Ruander
    Abstract:
    Technologies such as avionics and power electronics are driving the demand for thermal management schemes towards high heat fluxes and low surface temperatures. Typically, these applications require the dissipation of heat fluxes in the rage of 100-1000 W/cm² while maintaining surface temperatures lower than about 85 °C. Phase-change heat transfer...
    Resource Type:
    Dissertation
    Full Text:
    grateful with many faculty members, especially Sourabh Apte, Jim Liburdy, and Deborah Pence all whom I

  • Mechanically Enhanced and Optically Compatible Hydrogels for Particle Image Velocimetry in Porous Flow

    Creator:
    Cornwell-Arquitt, Luke
    Abstract:
    Hydrogels have been attractive for use as a medium in porous flow studies, but have always been limited in this role because of their poor mechanical properties. This project analyzes and tests two recently developed hydrogels, poly(methacrylamide-co-methacrylic acid) (PMM), and a heat-treated long chain PVA hydrogel. Particle image velocimetry (PIV)...
    Resource Type:
    Honors College Thesis
    Full Text:
    _____________________________________________________________________ Deborah Pence, Committee Member, representing Mechanical, Industrial, and Manufacturing

  • Effect of Active Trailing Edge Motion Upon Airfoil Energy Harvester

    Creator:
    Strahl, Jordan D.
    Abstract:
    The application of a flapping foil with prescribed trailing edge motion to energy harvesting in a low reduced frequency (k = fc/U∞) regime was experimentally studied. The effects of the phase and amplitude of the applied trailing edge motion upon time-variant power extraction capability have been measured and are interpreted....
    Resource Type:
    Masters Thesis
    Full Text:
    , both directly and indirectly. I would further like to express my thanks to Dr. Deborah Pence for being

  • Stability improvement of the one-dimensional two-fluid model for horizontal two-phase flow with model unification

    Creator:
    Abel, Kent C.
    Abstract:
    The next generation of nuclear safety analysis computer codes will require detailed modeling of two-phase fluid flow. The most complete and fundamental model used for these calculations is known as the two-fluid model. It is the most accurate of the two-phase models since it considers each phase independently and links...
    Resource Type:
    Dissertation
    Full Text:
    V. Pence, Dr. Brian Woods and Dr. Vinod Narayanan, for their valuable comments and their time. I

  • Investigations into the effects of a vibrating meniscus on the characteristics of drop formation

    Creator:
    Lewis, Kevin T.
    Abstract:
    As drop-on-demand (DOD) applications continue to gain ground in desktop inkjet-printing, 3D printing, fluid mixing, and other areas the demand for higher frequency operations are beginning to push against the current physical boundaries in DOD technology. The current research is exploring the possibility of controlling drop volume and velocity at...
    Resource Type:
    Masters Thesis
    Full Text:
    different vibration cycle waveforms. The 11.25 V Positive Step Waveform case measures the meniscus height

  • Modeling convective boiling flow with in-situ local vapor extraction

    Creator:
    Salakij, Saran
    Abstract:
    The pressure drop of convective boiling flow may be reduced by extracting vapor locally since the entire generated vapor does not have to travel through the entire channel length. In this study, the theoretical model was developed to simulate a convective boiling flow through a fractal-like branching microchannel network with...
    Resource Type:
    Masters Thesis
    Full Text:
    void fraction R Universal gas constant chα Channel aspect ratio R ext Extraction resistant vβ

  • Characterization of flow boiling in a fractal–like branching microchannel network

    Creator:
    Edward, Lee M.
    Abstract:
    Based on experimental investigations the present study evaluates flow instability and void fraction in a fractal-like branching microchannel network with rectangular cross-section. The hydraulic diameter of the channels ranged from 308μm at the inlet to 143μm at the outlet. The flow network used is characterized by set branching ratios for...
    Resource Type:
    Masters Thesis
    Full Text:
    of research. I would also like to thank Dr. Deborah Pence and Dr. Vinod Narayanan for all of their

  • Lift and drag characteristics of flexible pitching and heaving wings

    Creator:
    Rushen, Jesse
    Abstract:
    There is a pressing need for Micro Air Vehicles (MAV) that are light, powerful, and efficient to perform military reconnaissance missions and search and rescue operations. These MAVs have length scales on the order of 10 cm, where traditional steady flight wing designs perform poorly. An alternative flight mechanism is...
    Resource Type:
    Masters Thesis
    Full Text:
    v in g A m p lit u d e ( m ) 0 1 2 3 4 5 6 7 -20 0 20 P it c h in g A m p lit u

  • Analysis of spillway hydrodynamics for total dissolved gas prediction downstream of hydropower projects with free, plunging spillway jets

    Creator:
    Germann, Nathan A.
    Abstract:
    During spring and early summer hydropower projects are often forced to spill water through their spillways due to increased river flows of the runoff season. Flows which are directed through spillways--instead of through turbines--contain a substantial amount of energy. Stemming from the high energy content, spillway flows entrain air at...
    Resource Type:
    Masters Thesis
    Full Text:
    Hydropower Projects with Free, Plunging Spillway Jets. Abstract Approved: Kendra V. Sharp