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Filtering by: Committee Member Deborah, Pence V. Remove constraint Committee Member: Deborah, Pence V. Decade 2000-2009 Remove constraint Decade: 2000-2009

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  • 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

  • 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

  • Study of a constrained-film bubble absorber under cycle operating conditions

    Creator:
    Cardenas, Ruander
    Abstract:
    An experimental and numerical study of absorption of ammonia vapor bubbles into a constrained thin film of ammonia-water solution is presented in the context of a potential reduction in size of a heat-actuated heat pump component. A large-aspect-ratio channel with a depth of 600 µm restricts the thickness of the...
    Resource Type:
    Masters Thesis
    Full Text:
    compression of vapor refrigerant (absorption at A, pumping at P, desorption at D, expansion at V

  • Temperature and infiltration characterization of a constructed wetland for wastewater treatment

    Creator:
    Gregory, Christopher T.
    Abstract:
    The City of Woodburn, Oregon's Wastewater Treatment Plant (WWTP) has been investigating several natural alternatives for improving effluent quality. Based on its current National Pollution Discharge Elimination System (NPDES) permit, the WWTP will require additional reduction of temperature and ammonia levels in the summer, especially in the critical month of...
    Resource Type:
    Masters Thesis
    Full Text:
    camaraderie made all the difference. I would also like to thank John Bolte, Roy Haggerty, and Deborah Pence

  • Numerical study of droplet formation with nozzle dynamics and multiple droplet impingement

    Creator:
    Sangplung, Saangrut
    Abstract:
    Droplet formation from a flexible nozzle plate driven by a prescribed-waveform excitation of a piezoelectric is numerically investigated using a computational fluid dynamics (CFD) model with the VOF method. The droplet generator with a flexible nozzle plate, which is free to vibrate due to the pressure acting on the plate,...
    Resource Type:
    Dissertation
    Full Text:
    graduate committee members: Dr. Solomon C. Yim, Dr. Deborah V. Pence, Dr. Vinod Narayanan, and Dr. Brain

  • Numerical study of flow maldistribution in microchannels using fully resolved simulation

    Creator:
    Martin, Mathieu Georges Charles
    Abstract:
    This thesis addresses numerical simulation of flow maldistribution in microchannels. Microchannels are often associated with two phase-flows which can generate many problems such as plugging the channel or perturbing the flow. In this study we have used CFD and fully resolved technique to simulate what would happen in the case...
    Resource Type:
    Masters Thesis
    Full Text:
    : Sourabh V. Apte This thesis addresses numerical simulation of flow maldistribution in microchannels

  • Phase Separation in Microscale Convective Boiling

    Creator:
    Lewis, Kevin Terrence
    Abstract:
    It is hypothesized that extracting the vapor from two-phase flow in a microchannel will result in a lowered pressure drop required to drive the flow. The goal of this thesis is to construct an experimental device that will test this hypothesis by comparing a number of phase separating test conditions...
    Resource Type:
    Honors College Thesis
    Full Text:
    thank my project mentors Dr. James Liburdy and Dr. Deborah Pence, both of whom spent a great deal of

  • Analysis of iteration schemes for deterministic transport in binary Markovian mixtures

    Creator:
    Ching, Brenton S.
    Abstract:
    The Adams-Larsen-Pomraning coupled transport model has been used to describe neutral particle transport in binary stochastic mixtures. Here, the mixing statistics are considered to be homogeneous Markovian processes. While the model is robust, the convergence behavior and efficiency of this coupled model have not been addressed. Countless iterative methods could...
    Resource Type:
    Masters Thesis
    Full Text:
    . Andrew Klein (Nuclear Engineering), Dr. Deborah Pence (Mechanical Engineering), and Dr. Charles Brunner

  • A multiscale modeling approach for bubble-vortex interactions in hydro-propulsion systems

    Creator:
    Finn, Justin Richard
    Abstract:
    Multiphase flow dynamics are important in many naval and turbomachinery applications, where bubble interaction with low pressure, vortical structures can lead to undesirable cavitation effects. To better understand the underlying phenomena, a multiscale numerical framework is developed to simulate bubble laden flow in dynamic hydro propulsion systems. Several subproblems in...
    Resource Type:
    Masters Thesis
    Full Text:
    V. Apte Multiphase flow dynamics are important in many naval and turbomachinery applications