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Filtering by: Subject Investments -- Mathematical models Remove constraint Subject: Investments -- Mathematical models Degree Field Mechanical Engineering Remove constraint Degree Field: Mechanical Engineering Resource Type Dissertation Remove constraint Resource Type: Dissertation

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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
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    unstructured grid finite volume solver. Large Eddy Simulation technique with dynamic Smagorinsky subgrid model

  • Volumetric receiver development : a heat transfer and design evaluation of an advanced air heating solar thermal central receiver concept

    Creator:
    Drost, M. K.
    Abstract:
    The volumetric receiver is an advanced solar central receiver concept designed to produce high temperature air. This document presents the results of a heat transfer and performance evaluation of the volumetric receiver concept. The volumetric receiver consists of an array of ceramic fins or fibers arranged in concentric rows around...
    Resource Type:
    Dissertation
    Full Text:
    calculated using a Monte Carlo model where an innovative numerical scheme was used to improve computation

  • Performance of rotary regenerative heat exchanger--a numerical simulation

    Creator:
    Bae, Young Lib
    Abstract:
    This thesis examines the transient and steady-state temperature performance of a rotary regenerative heat exchanger. In contrast to previous studies on this problem, fluid flow in the circumferential direction was considered. Appropriate modeling was included to measure the effect of carry-over on the differential equations describing mass and energy conservation....
    Resource Type:
    Dissertation
    Full Text:
    express particular appreciation to Dr. Lindstrom for his advice on the mathematical development of this

  • Numerical modeling of the hydrodynamics of gas fluidized beds

    Creator:
    Wang, Yusan
    Abstract:
    This research involves a numerical study of the hydrodynamics of gas fluidized beds. We use the continuum model, treating both gas and particles as interpenetrating continua. The motion of gas and particles is strongly coupled by the interactions between them. For simplicity, we only consider drag forces. We use MacCormack's...
    Resource Type:
    Dissertation

  • Modeling in-situ vapor extraction during flow boiling in microscale channel

    Creator:
    Salakij, Saran
    Abstract:
    In-situ vapor extraction is performed by applying a pressure differential across a hydrophobic porous membrane that forms a wall of the channel as a means of reducing the local quality of flow boiling within the channel. As the local quality is reduced, the heat transfer capability can be improve while...
    Resource Type:
    Dissertation
    Full Text:
    can be used as a basis for a regime-based vapor extraction rate model. The effects of vapor

  • A numerical study of solid fuel combustion in a moving bed

    Creator:
    Ko, Daekwun
    Abstract:
    Coal continues to be burned by direct combustion in packed or moving bed in small size domestic furnaces, medium size industrial furnaces, as well as small power stations. Recent stringent restrictions on exhaust emissions call for a better understanding of the process of combustion of coal in beds. The present...
    Resource Type:
    Dissertation
    Full Text:
    mathematical model for a solid fuel bed, analytic solutions on temperature and concentration were obtained

  • Rebound predictions of mechanical collisions

    Creator:
    Lai, Liang-Ju
    Abstract:
    Predictions of mechanical collisions between two bodies frequently cannot be completed by the impulse-momentum equation together with a complete description of the motion of the system at the initial contact. Additional account must be taken of the deformations and frictional interaction induced by the impulsive reaction force, where the bodies...
    Resource Type:
    Dissertation
    Full Text:
    , a considerably simplified, coupled, conservative model, which captures the essential

  • Laminar natural convection within long vertical uniformly heated parallel-plate channels and circular tubes

    Creator:
    Vorayos, Nat
    Abstract:
    The problem of simple mathematical models of laminar natural convective flow within a long vertical parallel-plate channels and circular tubes kept at uniformly heated walls is revisited to seek a clear physical understanding of heat transfer mechanisms. A series solution method to analyze the fully developed flow and an integral...
    Resource Type:
    Dissertation
    Full Text:
    ..................................................................... 58 4.4 Mathematical Model ........................................................... 65 4.5

  • Interactions of a fully modulated inclined jet with a crossflow

    Creator:
    Dano, Bertrand P. E.
    Abstract:
    Jets in crossflow are used in a wide range of engineering applications and have been studied for more than 60 years. The transversal penetration and structure of a jet placed in a crossflow is known to be strongly three-dimensional. It is believed that, by using a pulsed jet inclined in...
    Resource Type:
    Dissertation
    Full Text:
    important modes are injected in the equations to model the effect of a parameter such as the pulsing

  • Reduced order multi-legged mathematical model of cockroach locomotion on inclines

    Creator:
    Peterson, Delvin E.
    Abstract:
    While the locomotion performance of legged robots over flat terrain or known obstacles has improved over the past few decades, they have yet to equal the performance of their animal counterparts over variable terrain. This work analyzes a multi-legged reduced order model of cockroach locomotion on variable slopes which will...
    Resource Type:
    Dissertation
    Full Text:
    Introduction 1 2 Mathematical Model 4 2.1 Previous Reduced-Order Modeling Efforts . . . . . . . . . . . . . 4