Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"HYDRODYNAMIC PARAMETERS"”.
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Scale-up investigation and hydrodynamics study of gas-solid fluidized bed reactor using advanced non-invasive measurement techniques
… developed mechanistic scale-up methodology for hydrodynamics similarity of gas-solid fluidized bed reactors (FBRs) by implementing our advanced non-invasive measurement techniques which are gamma ray computed tomography (CT) and radioactive particle tracking (RPT) that measure local hydrodynamic …
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Dynamics of Pitching Wave Energy Converter with Resonant U-Tank Power Extraction Device
… Lloyd's low order model, which assumes constant hydrodynamic parameters irrespective of the frequency, are demonstrated by a series of high fidelity CFD simulations. These simulations are a systematic series of fully viscous turbulent simulations, using unsteady RANSE solvers, of the water …
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Hydrodynamic Modeling for Autonomous Underwater Vehicles Using Computational and Semi-Empirical Methods
… is a need for the development of methods for hydrodynamic modeling. This thesis aims to determine the hydrodynamic parameters for the governing equations of motion for three autonomous underwater vehicles. This approach is two fold, using data obtained from computational flight tests and using …
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Nonlinear Free Surface and Viscous Effects on Underwater Vehicle Maneuvering and Seakeeping
… accommodate depth dependent effects by updating hydrodynamic derivatives using strip theory and boundary element method analysis. This new model can predict near-surface maneuvering motions of an AUV operating in calm or wavy waters. Alternative free surface affected motion predictions are …
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Modular Dynamic Modeling and Development of Micro Autonomous Underwater Vehicle: Lancelet
… is established. The empirical methods for the hydrodynamic coefficients and added mass estimation are summarized, and the relationship between hydrodynamic coefficients and hydrodynamic derivatives is derived. A torpedo shaped micro AUV named Lancelet with a novel multi jet drive propulsion …
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Scaleup and hydrodynamics study of gas-solid spouted beds
… were developed and used to evaluate different hydrodynamic parameters of spouted beds. These optical probes measure solids concentration, velocity and their time series fluctuations. Since solids concentration needs to be converted to solids holdup through calibration, for meaningful …
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Experimental and Numerical Modelling of a Multiple Oscillating Water Column Structure
… of studying and numerically modelling the hydrodynamic and thermodynamic interactions within the array of OWCs in the model platform, a nonlinear, time domain, numerical model, at a scale of 1:50, of a single OWC from the proposed platform, with control components, is developed. Predictions …
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Dynamic analysis of a marine riser
… and surface vessel motion is studied. The hydrodynamic loading on the riser is represented by a general form of the Morison equation. The nonlinearity of structure and drag force are completely retained and a numerical procedure in the time domain is developed. The effects of structural and …
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Modular Modification of a Buoyant AUV for Low-Speed Operation
… To maintain depth, they must generate a constant hydrodynamic force which requires that they swim at a constant pitch angle. Although tail fins are the typical mechanism for generating this control moment, they become ineffective at low speeds. To enable an existing AUV to travel at lower speeds, …
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Hydrodynamics of unconventional SWATH vessels in waves
… has significant non-linear effects on their hydrodynamic parameters. The parametric optimization of the hull shape of these vessels to reduce the total resistance in waves yields an interesting hull form where viscous effects become significant and this kind of problem is generally more …
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Studies of multiphase distribution and flow in bubble/ slurry bubble columns with /without internals and advanced sustainable construction materials using sophisticated measurement techniques
… deeply the effect of the dense internals on the hydrodynamics of bubble/slurry bubble column, systematic experiments were performed to visualize and quantify using the radioactive particle tracking (RPT) technique. A new methodology for implementing the radioactive particle tracking (RPT) …
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Development and Validation of a Simulator based on a First-Principle Flotation Model
… flotation model to incorporate various chemistry parameters such as zeta-potentials, contact angles, surface tension in addition to the physical and hydrodynamic parameters such as particle size, bubble size, and energy dissipation rate. In the present work, the effects of both hydrodynamic and …
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Experimental and modeling studies using packed bed reactors: Liquid phase ethylene production by hydrogenation of acetylene
… to the experimental data to estimate the kinetic parameters. Using Residence Time Distribution (RTD) experiments at scaled-down operating conditions for different catalyst bed packings and types of reactors (with and without thermowell), the axial dispersion coefficient and dynamic liquid holdup …
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Size-selective sediment transport and cross-shore profile evolution in the nearshore zone
… new intra-wave modules for predicting important hydrodynamic parameters that were validated using the experimental data. A novel, multi-size sediment transport model was formulated to compute individual transport rates of size-graded sediment fractions while accounting for their interaction and …
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Identification and characterisation of submesoscale activity over the continental shelf in the Bay of Biscay
… of clouds obscuring remote optical sensors. Hydrodynamic parameters like wind forcing and river runoffs were also studied to examine their impact on the submesoscale dynamics. Singularity exponent analysis was performed on the chlorophyll-α images to highlight distinct frontal structures …
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Studies in three phase gas-liquid-solid fluidised systems
… experimentally based and involved studies of the hydrodynamic parameters, phase holdups (gas and solid), particle mixing and segregation, and phase flow dynamics (flow regime and circulation patterns). The studies have focused particularly on the solid behaviour and the influence of properties of …
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A hydrodynamic study of nickel suspension in stirred tanks
… simulation strategies, particle properties and hydrodynamic operating conditions on mixing features such as the off-bottom solids suspension, cloud height, solids concentration distribution and local particle size distribution. The simulation results were compared with experimental ones, in …
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Design and development of an electrospun polymeric transcatheter heart valve for tissue engineering
… and optimising input (ambient and processing) parameters; and were characterised for their morphological (fiber geometry and architecture), mechanical (static and dynamic), and hydraulic (wettability and permeability) properties. Six distinct valve manufacturing concepts (leaflet suturing, …
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Learning and investigating phenomenological models for active matter
… we address the challenge of learning macroscopic hydrodynamic equations for active matter directly from microscopic data. Here, we present a framework that leverages spectral basis representations and sparse regression algorithms to discover PDE models from microscopic simulation and experimental …
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Heterogeneous flow structure and gas-solid transport of riser
… Chemical reaction is also coupled with flow hydrodynamics to board the industrial applications. This study mainly focuses on mathematical modeling approach based upon physical mechanism, and endeavor to validate model prediction against available experimental data. First of all, most …
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