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 40 for “"terminal velocity"”.
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Underwater sound radiation from single large raindrops at terminal velocity: the effects of a sloped water surface at impact
Previous studies have shown that terminal velocity raindrops striking a smooth water surface create oscillating bubbles that radiate significant underwater sound energy. Those studies identified two diameter ranges that produce bubbles: small drops (.8-1.1 mm diameter) which produce bubbles by one …
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Low Reynolds Number Settling of Cylindrical Rods with Various Geometries in a Quiescent Fluid
… was employed, with two side cameras tracking terminal settling velocities and orientations, while a bottom camera captured potential spinning motions. Using a three-dimensional calibration algorithm, the terminal velocities and orientations of the rods were determined in real-life space. …
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Properties of the Helium-3 a-B Phase Boundary
… of excitations with the boundary. The predicted terminal velocity of the interface when the phases are hypercooled is shown to agree with experiment. The lower temperature dissipative mechanism is proposed to be pair-breaking, and a saturation of the terminal velocity at low temperatures is …
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Properties of the 3He A-B phase boundary
… of excitations with the boundary. The predicted terminal velocity of the interface when the phases are hypercooled is shown to agree with experiment. The lower temperature dissipative mechanism is proposed to be pair-breaking, and a saturation of the terminal velocity at low temperatures is …
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Nonlinear Models and Geometric Structure of Fluid Forcing on Moving Bodies
… ground. Within this model, all trajectories in velocity space collapse to a 1-dimensional invariant manifold known as the terminal velocity manifold. This work presents methods to identify the terminal velocity manifold, investigates its properties, and extends it to a 2-dimensional invariant …
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Hydrophobic coatings for film boiling based drag reduction on a torpedo model
… camera in order to measure position versus time. Terminal velocity was extrapolated from the data and used to calculate drag coefficients. The data from this set of experiments showed that film boiling increased average terminal velocity by 23%, which corresponded to a 32% reduction in the drag …
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The transient motion of a solid sphere between parallel walls
This thesis describes an investigation of the velocity field in a fluid around a solid sphere undergoing transient motion parallel to, and midway between, two plane walls. Particle Image Velocimetry (PIV) was used to measure the velocity at many discrete locations in a plane that was perpendicular …
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Mechanisms of heat and mass transfer to and from single drops freely-suspended in an air stream
… initial diameter to investigate drop dynamics, terminal velocity and heat and mass transfer rates. Droplets of distilled, de-ionised water, n-propanol, iso-butanol, monoethanolamine and heptane were studied over a temperature range of 50oC to 82oC. The effects of substances that may provide drop …
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Methods for delivering liquid payloads from high altitudes
… proposed methods of delivering potable water at terminal velocity in a safe manner. Both mathematical and empirical tests were performed on all three devices. Out of the three delivery methods discussed, an auto-rotating wing design was chosen as both the safest and most reliable means for …
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Settling Velocity of Straight and Curved Rods at Low Reynolds Numbers in a Quiescent Fluid
… effects of microfibre geometry on the settling velocity. Microfibres have been mathematically modelled as simple straight rods in the past to estimate their settling velocity; however, samples collected demonstrate complex geometries. One common geometric parameter of realistic microfibres is …
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Application of the polynomial chaos expansion to multiphase CFD : a study of rising bubbles and slug flow
… quantities from these simulations are the terminal velocity of the bubble and terminal bubble shape. the simulations were performed using the open source gerris flow solver. A handful of test cases were performed to validate the simulation results against available experimental data and …
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Race Car Reverse Gear Design
… loads, including the effect of incline angle on terminal velocity and motor current draw. Simulated results show that the system can reliably move the car in reverse on slopes up to 10° before stalling, with current draw remaining within safe operational limits. The mechanical design includes a …
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Impact Analysis and Design Development for Air-Dropped Antarctic Seismo-Geodetic Ice Penetrator
… is dropped from an aerial vehicle, reaching a terminal velocity of 42 ms⁻¹; during impact with the snowpack surface SGIP experiences an average acceleration of approximately 500 ms⁻². Upon impact, a fore-body section separates from the upper aft-body "flare" section and continues several meters …
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Aerodynamic and Thermal Considerations for an Antarctic Ice Penetrator
… RIS. In order to ensure an appropriate impact velocity and angle, SGIP’s aft-body must be sized to produce a drag force that results in a target terminal velocity of 42 m/s while remaining aerodynamically stable. A finite element flow simulation in SolidWorks and analytical stability …
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Constrained trajectory optimization of a soft lunar landing from a parking orbit
… trajectory evaluation included fuel expenditure, terminal attitude, thrust histories, etc.. The vehicle was initialized in a circular parking orbit and the trajectory divided into three distinct phases: de-orbit, descent, and braking. Analysis was initially performed with two-dimensional …
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Optimal and on-board near-optimal midcourse guidance
… a multiple-shooting algorithm. A requirement on terminal velocity magnitude is examined for its effect on firing range. Next, a study of the optimal midcourse guidance problem with reduced-order models is presented. The models under study, in addition to the point-mass model, are: - Singularly …
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Droplet Drag Modeling on Spray Conditions
… (DNS) to simulate a droplet falling at its terminal velocity in high-pressure air. An in-house code developed for interface-capturing DNS of multiphase flows is employed for the simulation. The drag coefficient is calculated, and the results are consistent with the existing literature for …
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Hydrodynamic drag force in liquids
… II, liquid air, ethyl acetate, and water. The terminal velocity of each sphere falling in the confined liquid was measured. When falling at constant velocity, the hydrodynamic drag force, D, is equal to the weight of the sphere, and the drag coefficient, CD, in the formula for the drag force, D …
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Direct Simulations of Fluid-Particle Flow in Newtonian and non-Newtonian Fluids Using Coupled Lattice Boltzmann and Discrete Element Methods
… of the particle cloud quasi-steady settling velocity to the single-particle terminal velocity in the same fluid, increases when the cloud settles in the shear-thinning suspensions. This velocity increase is more significant at a low Reynolds number. At even lower Reynolds numbers, the cloud …
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Evaluation of the Performance of a Charged Droplet Scrubber (Aerosol, Collection)
… scrubbers where the collectors usually fall at terminal velocity in the collection chamber, whereas the latter can be used to calculate the collision effeciency as a function of the travel distance of the accelerating collectors that are employed in high-energy scrubbers. Two corresponding …
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