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 26 for “"Wetted surface"”.
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Coalescence Behaviour of Liquid Drops at Solid Surfaces
… water were investigated using both high and low surface energy solid surfaces. The contact angle varied with the size of the drop and with surface characteristics of the solid. The mechanisms by which a contact angle is subtended are explained with respect to the nature of a surface. The true …
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Effects of various inefficiencies in rowing on shell speed
… The sources of inefficiency tested are wetted surface area, coefficient of friction, dynamic and static weight, stroke length, slide acceleration, and stroke rating. The effects on shell velocity were normalized to determine which sources resulted in the greatest inefficiencies. The …
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Numerical and experimental analysis of initial water impact of an air-dropped REMUS AUV
… is primarily related to the fluid forces on the wetted surface of the object. The shape-dependent added-mass coefficients express the fluid forces integrated over the body, and thus physically represent the additional inertia of water accelerated with fie body. The field of hydrodynamic impact …
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WEAKLY NONLINEAR DYNAMIC ANALYSIS OF FLOATING BODIES IN WAVES
… pressure distribution near the free surface. The idea of strip theory is then adopted to evaluate the Froude-Krylov force and the added mass and damping forces of the three dimensional floating body. The effects of instantaneous wetted surface and large motion of each strip are also …
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Time domain simulation of hydroelastic response of ships in large amplitude waves
… forces, all evaluated over the instantaneous wetted surface. Non-linear forces due to slamming (bottom impact and flare) and green water (treated in a quasi-static manner) are also added. One aim of the thesis is to investigate the influence/importance of each of the non-linear hydrodynamic …
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Numerical and experimental analysis of initial water impact of an air-dropped REMUS AUV
… is primarily related to the fluid forces on the wetted surface of the object. The shape-dependent added-mass coefficients express the fluid forces integrated over the body, and thus physically represent the additional inertia of water accelerated with the body. The field of hydrodynamic impact …
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Predicting Drag Polars For Micro Air Vehicles
… ratios varying from 1.2 to 1.6 and ratios of wetted surface area to planform area from 2.6 to 3.9. <p> A force balance was used to measure the lift and drag on the MAVs at angles of attack ranging from -5 degrees (or -10 degrees) to 10 degrees. The force balance allowed the MAVs to rotate in …
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Performance limits of axial turbomachine stages
… consisting of a specified geometry and a surface velocity distribution with turbulent boundary layers. The assumptions and parameterization of the stage geometry allow for calculation of the magnitude of various loss sources in terms of eight input parameters. By (1) considering only the …
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Evaluation of Internal Fin Geometry for Heat Transfer Enhancement in Automobile Exhaust Energy Harvesting Systems
… of the flow. They also provide for greater wetted surface area achieving higher heat transfer. The flow and heat transfer behavior inside the exhaust pipe test section with internal fins is modeled using commercial numerical software. The thermal and flow behavior through both these internal …
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Improved Design Method for Cambered Stepped Hulls with High Deadrise
… the method was not suitable for cambered planing surfaces with high deadrise angles greater than 15 degrees. The goal of this thesis is to create a design procedure for swept-back cambered planing surfaces with high deadrise angles that does not require multiple iterations to obtain an optimal …
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Geometry mediated drag reduction using riblets and wrinkled surface textures
The surfaces of many plants and animals are covered with a variety of micro-textures such as ribs or 3D tubules which can control surface-mediated properties such as skin friction. Inspired by the drag reducing ability of these natural structures, especially the ribbed features on shark denticles, …
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A mixed mode function - boundary element method for very large floating structure - water interaction systems excited by airplane landing impacts
… boundary conditions. A linearised composite free surface boundary condition and an undisturbed far field (infinity) radiation condition are considered. The Green function, or kernel, of BEM formulation is a fundamental solution of the Laplace equation assuming an infinite fluid domain. The motion …
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Computation of nonlinear hydrodynamic loads on floating wind turbines using fluid-impulse theory
… and the discretization of the nonlinear free surface. The module computes linear and nonlinear loads - including hydrostatic, Froude-Krylov, radiation and diffraction, as well as nonlinear effects known to cause ringing, springing and slow-drift loads - directly in the time domain and a …
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Spray and Single Droplet Impingement on a Wall
… yielding acceptable agreement. The effect of surface roughness on the splashing threshold is incorporated into the study and is found to play a major role in dictating the average sizes of secondary droplets. The second part of this thesis presents an analytical model of single droplet …
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A potential flow model for separated flow around airfoils
… in terms of the pressure distribution on the wetted surface of the plate but a high suction peak appeared on the bubble boundary, as well as an unsatisfactory bubble shape. In the present study, no improvement has been obtained by using more singularities, unlike the case for thenormal flat …
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Local Water Slamming of Nonlinear Elastic Sandwich Hulls, and Adiabatic Shear Banding in Simple Shearing Deformations of Thermoelastoviscoplastic Bodies
… issues resolved in this work include finding the wetted surface of the hull, nonlinear deformations of the fluid due to convective part of acceleration, effects of geometric nonlinearities on hull\'s deformations, resolution of the jet tip, as well as the initiation and propagation of delamination …
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Material Degradation Studies in Molten Halide Salts
… high temperatures severely corroded even the non-wetted surface of the alloy. The presence of Mg in its metal form in the salt resulted in an even higher mass-loss possibly due to Mg-Ni interaction. The study also investigated the corrosion characteristics of several nickel and ferrous-based …
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Surfactant Formulations to Enhance Triclopyr Amine Efficacy: Effects on Adhesion, Retention and Contact Phytotoxicity On Three Hardwood Species
… which can be accomplished by lowering the surface tension of the spray with surfactant materials. The second is by improving the penetration or uptake into the target. Organosilicone surfactants can reduce the surface tension of aqueous pesticides far below that which is possible with …
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Flows in Grooved Channels
… the smooth channel value despite increase of the wetted surface area. For sufficiently short wavelength grooves, shear is eliminated over a majority of the wetted area but there is a rapid rise of local shear and pressure forces around the tips of grooves which counteracts the elimination of shear …
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Terrestrial Water Storage Change Over Dryland Regions Using Observational Data and Model Simulations
… (T) through root water uptake of subsurface water. However, TWS recovers slowly during wet periods due to the evaporative loss from the wetted surface soils. This study emphasizes the importance of evapotranspiration (ET) and its partitioning in controlling TWS dynamics over drylands. …
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