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 28 for “"slip velocity"”.
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The Effects of Obesity and Age on Balance Recovery After Slipping
Falls due to slipping are a serious occupational concern. Slipping is estimated to cause 40-50% of all fall-related injuries. In 2011, falls resulted in 22% of injuries requiring days away from work. Epidemiological data indicates that older and obese adults experience more falls than young, …
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Laboratory experiments of multi-phase plumes in stratification and crossflow
… sediment size was measured using a micrometer. Slip velocities among all buoyancy sources ranged from 3 to 35 cm/s. Stratified experiments investigated the dependence of plume properties on the nondimensional slip velocity, UN= us/(BN)1/4 , where u, is the slip velocity, B is the total kinematic …
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Effects of droplet size on intrusion of sub-surface oil spills
… from the plem, but only those with smallest slip velocity (UN </+0.3) intrude. An analytical model assuming well-mixed particle distributions within the intrusion layer was also used to predict the spread of the particle distribution based on initial buoyancy flux B, stratification frequency …
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Intrusion dynamics of small oil droplets from a deep ocean blowout
… a salt-stratified tank. Non-dimensional particle slip velocity UN ranged from 0.1 to 1.9. While particles of all sizes were affected by the stratification, only those with UN less or equal to 0.5 were observed to enter the intrusion layer. The spatial distributions of beads, collected on a bottom …
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Liquid flow past nanoscale objects
… sheet and show that the drag coefficient and the velocity profile can be modeled using Navier-Stokes equation provided corrections are applied to the equation. The corrections are the effective shape of the graphene sheet, the slip velocity correction and the viscosity and density layering …
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Evaluation of transport relative to the tidal mixing front on southern Georges Bank
… to the front was on the order of the drifter's slip velocity and therefore did not support the existence of a mean, advective flow. No movement relative to the front of the dye patch center of mass also indicated a lack of advective flow. Diffusive transport did occur as the dye patch spread …
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Evaluation of transport relative to the tidal mixing front on Southern Georges Bank
… to the front was on the order of the drifter's slip velocity and therefore did not support the existence of a mean, advective flow. No movement relative to the front of the dye patch center of mass also indicated a lack of advective flow. Diffusive transport did occur as the dye patch spread …
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Efeitos viscosos em cilindros imersos em fluidos não-newtonianos
The approximation dueto Pohlhausen for the velocity profile within the boundary layer was used to solve the problem of a bi-dimensional interface immersed in a non-Newtonian fluid, whose rheological behaviour can be described by the power law model. Arbitrary values of the flow behaviour index (n) …
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Direct simulation Monte Carlo (DSMC) in micro flows
… Base on the database of DSMC computation, new slip velocity models suitable to a wide Kn range are proposed for micro shear flows. Furthermore, 3-D micro flows in a slider air bearing and micro flows in a??slip flowa?? and a??transition flowa?? regime in micro ducts with different …
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A coarse grained transport model for nanofluidic systems
… conditions up to a critical force, where the MD slip velocity starts to deviate from the equilibrium prediction. Finally, the CG model was able to achieve ≈ 20x speedup compared to MD simulations, making it more suitable for flows close to experimental conditions, where MD produces a poor signal …
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A Lattice Boltzmann model for diffusion of binary gas mixtures
… flow driven by a density gradient with diffusion slip occurring at the wall is studied in depth. The first part of this thesis sets the foundation for the multi-component model used in the subsequent chapters. Commonly used single component LB methods use a non-physical equation of state, in which …
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Unsteady blood flow in the stenosed artery subjected to magnetic field and injected nanoparticles
… due to strong resistance. However, the blood velocity increased with respect to the body acceleration, the pressure gradient and the permeability parameter. For the second problem, it was observed that the velocity increased with respect to the slip velocity and the body acceleration but …
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A comprehensive analytical model for pneumatic tires
… tread deformation is obtained by integrating the slip velocity over the contacting time. By employing a rigid ring concept, the transient characteristics of the tire can also be examined in low frequency ranges. The ideas that are presented in this study are verified with a set of measurement …
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The harmonic excitation of a cylindrical bubble pinned to a plane surface: flow field and oscillation dynamics
… be resolved to obey simultaneously the correct slip velocity at the wall and the correct stresses at the bubble surface, both of which are specified by the exact shape of the bubble. We evaluate the steady streaming flow by means of an eigenfunction expansion, and compare the results to …
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Field-driven dynamics of dilute gases, viscous liquids and polymer chains
… The problems considered herein pertain to the slip-induced motion of a rigid, spherical or nonspherical particle in a fluid in the presence of an inhomogeneous temperature or concentration field or an electric field, and the dynamics of charged polymers animated by the application of an …
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Experimental Study of Two-Phase Cavitating Flows and Data Analysis
… of bubble dynamics in cavitating flows, with velocity information obtained for two phases; (2) measure the slip velocity between the liquid and the vapor to provide the validation data for the numerical cavitation models; (3) consider the thermodynamic effects of cavitation to establish the …
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Measurement of oil-water flows in deviated pipes using thermal anemometry and optical probes
… locally at the same time, the continuous phase velocity, the dispersed phase velocity and the volume fraction. The results from testing the dual probe were satisfactory except when used to measure the water velocity in deviated flow. The hot-film anemometer was not capable of measuring back …
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The hydraulic transport of high concentration stabilized flow full plant mineral tailings
… by postulating the following mechanisms : 1. Slip velocity at the pipe wall 2. Wall effects due to particle interaction 3 . Boundary layer effects 4. Plug flow at high concentrations 5. Particle migration away from the wall leaving a sheared annular zone 6. Lateral dispersive stress acting …
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The Influence of Occupational Footwear on Slip Responses
Falls in the workplace most often occur due to slips and unsuitable footwear. While industry standardized occupational footwear (OF) is required for the safety of occupational activities, little is known about how OF influences how individuals respond to an unexpected slip. Therefore, the purpose …
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Study of the Performance of a Large Mechanically-Agitated Extraction Column
… local drop velocities were much higher than the slip velocity used to calculate Kcal. Assuming that all the drops were oscillating, with mass transfer from the dispersed to continuous phase, the Rose and Kintner correlation gave the best approximation to the overall experimental mass transfer …
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