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Filtering by: Creator Weber, Janice M. Remove constraint Creator: Weber, Janice M. Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • Turbulence induced loads on a teetered rotor

    Creator:
    Weber, Timothy L.
    Abstract:
    Development of variable speed horizontal axis wind turbines has resulted in a need for an analysis code with a rotor speed degree-of-freedom. This study develops a five degree-of-freedom time domain computer code that evaluates blade and rotor, mean and cyclic loads with nonlinear aerodynamics together with atmospheric turbulence as a...
    Resource Type:
    Dissertation
    Full Text:
    OF THE THESIS OF Timothy L. Weber for the degree of Doctor of Philosophy in Mechanical Engineering

  • Evaluation of the predictive capability of two-phase flow maps for microchannel condensation of R-134a at low mass flux conditions

    Creator:
    VanderPutten, Michael A.
    Abstract:
    Predicting condensation flow regimes and the associated heat transfer and pressure drop in microchannels is critical for designing terrestrial and space systems for heating, cooling, power generation, and advanced manufacturing. It is well established that in flows approaching the microscale (Dh < 1 mm) gravity-dominated flow regimes become less relevant,...
    Resource Type:
    Masters Thesis
    Full Text:
    : ________________________________________________________________ Brian M. Fronk Predicting condensation flow regimes and the associated heat transfer

  • Heat treatment characteristics of heavily doped epitaxial silicon materials

    Creator:
    Wijaranakula, Witawat
    Abstract:
    Nucleation and growth kinetics of oxygen precipitates and bulk defects in epitaxial silicon wafers were investigated. Low temperature nucleation heat treatments were applied to the well characterized epitaxial silicon wafers before and after the epitaxial deposition processing. Subsequently the wafers were heat treated at a high temperature. In the case...
    Resource Type:
    Dissertation
    Full Text:
    Heavily Doped Epitaxial Silicon Materials Redacted for privacy Abstract approved: Peter M. Burke

  • Investigation of In-tube Non-equilibrium Condensation of Low Global Warming Potential Refrigerants

    Creator:
    Jacob, Tabeel A.
    Abstract:
    This work investigates the in-tube condensation of low global warming potential (GWP) zeotropic refrigerant mixtures R448A, R450A, R452A, R454B and R454C. These refrigerants have been proposed for a wide range of commercial heating, ventilation, air-conditioning applications, but their heat and momentum transport phenomenon were not well understood. Thus, in this...
    Resource Type:
    Dissertation
    Full Text:
    approved: Brian M. Fronk This work investigates the in-tube condensation of low global warming potential

  • Condensation of a zeotropic mixture, R-454C, and its individual components, R-1234yf and R-32, in microfin tubes

    Creator:
    Matty, Ethan P.
    Abstract:
    This work compares the condensation heat transfer and pressure drop for zeotropic refrigerant R-454C and its individual components, R-32 and R-1234yf, in horizontal microfin tubes. One microfin tube has a 4 mm outer diameter, 0.18 mm wall thickness, and a surface area ratio of 1.56. The second tube has a...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Brian M. Fronk This work compares the condensation heat transfer and pressure drop for

  • Flow measurement and characterization in shallow geothermal systems used for downhole heat exchanger applications

    Creator:
    Churchill, David J.
    Abstract:
    This thesis reports on an investigation of flow patterns in shallow geothermal wells in Klamath Falls, Oregon, Although wells have been extensively used in the area, the exact nature of the flows in the wells has not been characterized. Flow characterization is a principal object of this study. Horizontal crossflows...
    Resource Type:
    Masters Thesis
    Full Text:
    APPLICATIONS Abstract approved: Redacted for privacy Gordon M. Reistad This thesis reports on an

  • Dislodgement and deformation of microbubbles in laminar channel flow

    Creator:
    Tence, David A.
    Abstract:
    In this thesis the critical parameters involved in the dislodgement and deformation of microbubbles in laminar channel flow, are determined and evaluated. Experimentally the effects of surface tension, viscosity, fluid flow rate, density, and bubble diameter on bubble dislodgement were evaluated. A theoretical scale analysis was performed which provided a...
    Resource Type:
    Masters Thesis
    Full Text:
    were generated of Weber number, at bubble dislodgement, versus Reynolds number and Weber number as a

  • A Permanent-Magnet Linear Generator Wave Energy Converter for Low Power Ocean Sensors

    Creator:
    Miles, Lillian F.
    Abstract:
    Renewable energy sources are becoming increasingly important due to their low environmental impact and limitless nature. This thesis explores the design of a 250 mW permanent magnet linear generator wave energy converter to power ocean sensors. While many wave energy converters exist, this is a unique application because the wave...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: _____________________________________________________________________ James M

  • Experimental study of subcooled water spray cooling using flow symmetric micro-structured surfaces

    Creator:
    Tulchinsky, Alex M.
    Abstract:
    Spray impingement cooling has been shown to be a leading candidate for future high heat flux cooling applications. In general, spray cooling curves consist of three heat flux regimes; single-phase, two-phase and critical heat flux (CHF). CHF is considered the design limit for almost all two-phase cooling applications, as a...
    Resource Type:
    Masters Thesis
    Full Text:
    widths and heights varied from 100 to 500 μm, and 30 to 60 μm, respectively. Fin width and height

  • Modeling hop kilning with respect to energy consumption and drying kinetics

    Creator:
    Thomas, Matthew W.
    Abstract:
    Currently, little work has been performed studying energy consumption in hop kilning. This thesis explores drying with an alternative drying schedule that extends the initially elevated drying temperature currently used by growers and examines its impact on drying time and energy use. Extending the time of the initially elevated drying...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________ Brian M. Fronk Karl R