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Filtering by: Creator Nielsen, James F. Remove constraint Creator: Nielsen, James F. Committee Member Liburdy, James Remove constraint Committee Member: Liburdy, James

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  • Shear and convective turbulence in a model of thermohaline intrusions

    Creator:
    Mueller, Rachael
    Abstract:
    Thermohaline interleaving is an important mechanism for laterally fluxing salt, heat, and nutrients between oceanic water masses. Interleaving is driven by a release of potential energy resulting from the vastly differing diffusivities of heat and salt in seawater. The flows are composed of stacked intrusions that flux more buoyant and...
    Resource Type:
    Masters Thesis
    Full Text:
    members –Jim Moum, Yvette Spitz and James Liburdy–for giving excellent feedback in the making of this

  • Microscale thermal management using membrane vapor extraction

    Creator:
    Apreotesi, Mario A.
    Abstract:
    With the miniaturization of microelectronics and increase of processor speeds in the last few decades, thermal management is drastically affecting overall packaging and system capabilities. Due to the special needs introduced, research focusing on microscale cooling has increased. This study combines the positive characteristics of single- and two-phase flows in...
    Resource Type:
    Honors College Thesis
    Full Text:
    James Liburdy, representing Mechanical Engineering

  • Contribution of cold seep barite to the barium geochemical budget of a marginal basin

    Creator:
    McQuay, Erica L.
    Abstract:
    Large barite (BaSO4) structures mark cold seeps in the southern San Clemente Basin. Barium flux to San Clemente sediments is two to three times greater than fluxes measured in surrounding California Borderland basins. Analyses of sediment trap material, water column samples, sediments and pore water indicate that expected bariumbearing mineral...
    Resource Type:
    Masters Thesis

  • Upscaling non-Darcy flow using mixed finite element method

    Creator:
    Garibotti, Cristiano Rodrigues
    Abstract:
    In this paper we develop an upscaling technique for non-Darcy flow in porous media. Non-Darcy model of flow applies to flow in porous media when large velocities occur. The well-posedness results for theory of quasilinear elliptic partial differential equations. To discretize the model we used lowest order Raviart-Thomas mixed finite...
    Resource Type:
    Masters Thesis
    Full Text:
    energy norm and it is equivalent to the norm of the Hilbert space H. Definition 2 A function f : Rn ⊃ D

  • Nonlinear model reduction using the group proper orthogonal decomposition method

    Creator:
    Dickinson, Benjamin T.
    Abstract:
    Proper orthogonal decomposition (POD) in conjunction with the Galerkin projection has been used as a model reduction technique for the tractable real-time control of high-dimensional systems. While POD based model reduction may improve the tractability of high-dimensional models, the nonlinear POD based model may be impractical for control due to...
    Resource Type:
    Masters Thesis
    Full Text:
    the form of Burgers’ equation considered here: ut + uux + uuy = ν (∇2u) + f, (x, y) ∈ (0, 1)× (0, 1

  • 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:
    circulation ratio (f*) and oil pump control voltage for four different operating conditions. The dynamical

  • 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:
    near the separated region. 84 6.1.8 Time history plot for (a-c) Γ; (d-f) Γp. Left is leading edge

  • 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:
    you Dr. James Liburdy, Dr. Vinod Narayanan, Dr. Sourabh Apte and Dr. Jhon Nairn for serving on my

  • 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:
    Narayanan, and Dr. James Liburdy for their continual support and assistance in completing this research. A

  • 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:
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 Illustration of the fluid domain, ΓF containing a resolved particle, ΓP , with boundary B