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  • 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:
    bubble by liquid; F`→b = FG + FP + FD + FL + FAM + Fcoll + FṘb FAM added mass force on a bubble fb

  • Preliminary Numerical Study of a Condenser Using Fractal-Like Patterned Hydrophobic and Hydrophilic Strips

    Creator:
    Lazaroff, Spencer A.
    Abstract:
    Condensers are vital components of power plants and are often one of the most major cost concerns when planning construction. Generally speaking, the surface area required to dissipate the heat generated in the boiler is so great that enormous and expensive structures are necessary. The usage of a hybrid surface...
    Resource Type:
    Honors College Thesis
    Date Created:
    Full Text:
    ............................................................................... 11 1.4. Study impact

  • 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:
    range of gas and liquid flow conditions. Five different flow patterns are defined in the 11

  • Modeling and simulation of volume displacement effects in multiphase flow

    Creator:
    Cihonski, Andrew John
    Abstract:
    There are many options available when selecting a computational model for two-phase flows. It is important to understand all the features of the model selected, including when the model is appropriate and how using it may affect your results. This work examines how volume displacement effects in two-phase Eulerian-Lagrangian models...
    Resource Type:
    Dissertation
    Full Text:
    . For the range 10−1 < Stb < 1, a two-fluid Eulerian approach [11, 12] is valid, wherein the carrier

  • Modeling of Non-Spherical Particle Dynamics in a Non-Uniform Flow

    Creator:
    Alshehri, Ahmad S.
    Abstract:
    Turbulent flow with suspended, non-spherical particles can be found in nature and several industrial applications. Although turbulence with dispersed spherical particles has been studied extensively, modeling the dynamics of non-spherical particles in a turbulent flow has not been studied extensively. Motion of spherical particles in complex flows is typically captured...
    Resource Type:
    Masters Thesis
    Full Text:
    mechanism has been investigated and ad- 11 dressed in the literature, the real cause behind settling

  • Performance characterization of an integrated microscale hydrogen combustor recuperator and oil heat exchanger

    Creator:
    Haley, David B. (David Brien)
    Abstract:
    Experiments on a novel, microscale hydrogen combustor heat exchanger (µCHX) are presented in this thesis. The µCHX has been designed to efficiently transfer thermal energy to a heat transfer fluid for use in desorption of hydrogen from a metal hydride storage system of a hydrogen-powered fuel cell vehicle. The experimental...
    Resource Type:
    Masters Thesis
    Full Text:
    ..................................................................................................................................... 157 11. CONCLUSIONS AND RECOMMENDATIONS

  • 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:
    correlations [11]. Both the DEM and HLE approaches are usefull in studying the highly dynamic 6 bubble

  • Investigation of volumetric coupling effects on particle-laden turbulent flows at dilute to moderate loadings

    Creator:
    Cihonski, Andrew John
    Abstract:
    Particle-laden turbulent flows are of great importance in many industrial applications and are sufficiently complex to require multiple methods of study to provide a better understanding of the dominant physical mechanisms present in these processes. This work on large-eddy simulation of particle-laden flows seeks to help provide the building blocks...
    Resource Type:
    Masters Thesis
    Full Text:
    ] [11] [13]. 2.1 Modeling Methods As mentioned previously, there are several options available for

  • On the Euler-Lagrange Modeling of Particle-laden Turbulent Flows

    Creator:
    Pakseresht, Pedram
    Abstract:
    Particle-laden turbulent flows, wherein a large number of small size particles are dispersed in a fluid, are widely encountered in environmental and industrial applications. Understanding their underlying physics, making predictions without performing expensive experiments, and ultimately optimizing the systems carrying such flows, require accurate and robust modelling tools. The Euler-Lagrange...
    Resource Type:
    Dissertation
    Full Text:
    formulation. Fox (2014) 11 provided a rigorous derivation of a Reynolds-average turbulence model for colli

  • 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:
    the PID controller is: sk s k ksG d i pc ++=)( , (2) which can be rewritten )11()( '' ' s s