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Filtering by: Dspace Collection Electronic Theses and Dissertations Remove constraint Dspace Collection: Electronic Theses and Dissertations Committee Member Liburdy, James Remove constraint Committee Member: Liburdy, James Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering

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  • Radiation Emissions from Turbulent Diffusion Flames Burning Large Hydrocarbon Fuels

    Creator:
    Zeuthen, Eric D.
    Abstract:
    The purpose of this study is to measure and compare radiation emissions from flames burning large hydrocarbon fuels to assist in understanding how the molecular composition changes radiation emissions. Radiative heat transfer is significant because it is a primary mode of heat transfer for many combustion devices. This study also...
    Resource Type:
    Masters Thesis
    Full Text:
    dioxide and water vapor) and not from soot. These findings were verified by the radiation intensity

  • DNS study of Particle-bed-Turbulence Interactions in Oscillatory Flows

    Creator:
    Ghodke, Chaitanya Deepak
    Abstract:
    Turbulent flows over rough surfaces are encountered in many engineering and geophysical applications. Flows of this nature, due to their increasing technological interests, have been a subject of rigorous investigation in recent years. Of the particular interest to the oceanographic community is the study of turbulent oscillatory flow over rough...
    Resource Type:
    Dissertation
    Full Text:
    of drag and lift forces on sediment grains, the time-scales associated with these vari- ations, and

  • Chemometrics-based Approach for Predicting Low Temperature Combustion Engine Fuel Performance

    Creator:
    Daly, Shane
    Abstract:
    Low temperature combustion (LTC) engines offer improved efficiency and reduced emissions over traditional gasoline spark-ignited and diesel compression-ignition engines. The ability to produce fuels optimized for LTC engines could help increase efficiency and therefore improve fuel economy, insomuch that Federal fuel economy standards could be met. Currently, a fuel performance...
    Resource Type:
    Masters Thesis
    Full Text:
    LTC index (±0.4 for FACE A and C). To the author’s knowledge, these models are novel in

  • A modeling and empirical study of a novel bimodal natural gas internal combustion engine with fuel compression capability

    Creator:
    Elgin, Robert C., III
    Abstract:
    Given the current abundant supply and cheap price of natural gas (NG) in the United States, there is a significant opportunity to use this fuel for transportation. However, there are few fueling stations for consumers. To address this need, a dual-mode engine has been developed where in one mode all...
    Resource Type:
    Masters Thesis
    Full Text:
    types of mainline compressors in use today [10]. These compressors are very large (see Figure 4) and

  • Numerical simulation of cavitating bubble-laden turbulent flows

    Creator:
    Shams Sobhani, Ehsan
    Abstract:
    Many engineering devices and propulsion systems suffer from undesirable effects of cavitation; such as degradation in the efficiency of pumps and turbines, generation of noise and vibration on ship propeller, increased drag and erosion of propeller blade, etc. In spite of decades of research on this problem, detailed study of...
    Resource Type:
    Dissertation
    Full Text:
    methods and continuum methods. In a more general sense, these are the main strategies often used in two

  • 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:
    . Modeling approaches for these types of flows, must be diverse in nature, and capable of handling multi

  • Spatio – temporal temperature variations during droplet impingement evaporation : effects of nanofluid and nano-structured surface

    Creator:
    Graber, Christof
    Abstract:
    Droplet and spray impingement cooling are typically used in high heat flux thermal management. In this thesis, droplet impingement and evaporation heat transfer characteristics are determined from measured spatially- and temporally- varying fluid and surface temperatures. Unique to this study is the documentation of the effects of using a nanofluid...
    Resource Type:
    Masters Thesis
    Full Text:
    1 INTRODUCTION The rapid development of high-performance electronic devices and systems over the

  • Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network

    Creator:
    Kwak, Younghoon
    Abstract:
    Two-phase gas-liquid flows in microscale fractal-like branching channel flow networks were experimentally studied to assess the validity of existing void fraction correlations and flow regimes based on superficial gas and liquid velocities. Void fractions were assessed using two different methods. First, void fraction data were acquired using a High-Speed-High-Resolution (HSHR)...
    Resource Type:
    Dissertation
    Full Text:
    to 2.5 g/min and from 5.2x10-5 g/min to 1.3x10-2 g/min, respectively. These flow rates yielded

  • Detection and analysis of separated flow induced vortical structures

    Creator:
    Snider, Stephen David Louis
    Abstract:
    Flow separation is an important phenomenon in fluid dynamics because of the effect it has on lift and drag on immersed bodies. Areas of swirl within a separated flow region may have a distinct effect on the surface forces, modifying the lift and drag characteristics. A correlation between the passage...
    Resource Type:
    Masters Thesis
    Full Text:
    affected by separation and swirls in the flow. These locations can be used to place sensors to detect any

  • Proportional integral derivative control of an oil-heated fractal-like branching microchannel desorber

    Creator:
    Davis, Keith R.
    Abstract:
    A PID controller was designed to control the performance of an oil-heated fractal-like branching microchannel desorber for use in an ammonia-absorption refrigeration system. Both the amount and concentration of ammonia refrigerant generated at the desorber can be controlled by choosing the rectified circulation ratio as the controlled variable in a...
    Resource Type:
    Masters Thesis
    Full Text:
    -Input Single-Output (SISO) models, these systems require more complicated controllers and more