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 “"Wall Effects"”.
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PIC simulation of SPT Hall thrusters : high power operation and wall effects
… is still unclear. Strong magnetic mirror effects, that are not reported in experimental data, are found in the simulation. Meanwhile, two sputtering models are added to the simulation and tested. A yield model based on [4]'s theories and implemented with [5]'s functions is found to agree …
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Experimental evaluation and modeling of ground, ceiling and wall effects for small-scale quadcopters
L'abstract è presente nell'allegato / the abstract is in the attachment
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Implementation of a separated flow panel method for wall effects on finite swept wings
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
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Investigation of Magnetic Field Profile Effects in Hall Thrusters
… Maxwellian electrons, and negligible thruster wall effects. The solved equation kept magnetic field as an input to the model for the analysis. The magnetic field was altered by changing the shape through the thruster, while keeping the maximum point fixed, and by shifting the profile, while …
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NATURAL AND VENTILATED CAVITATING FLOW OVER HIGH-SPEED UNDERWATER VEHICLE
… The mechanism of the free surface and bottom wall effects on the cavity profile and stability are studied. Then we present a new passive flow control method using small protrusions as cavitators. Compared with the case without the cavitator, the supercavitating hydrofoil controlled by the …
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Drag coefficients on razor clams in slightly fluidized granular media
… as well as in an environment void of wall effects. Testing is done using a dead clam attached to a stainless steel rod which is passed through the fluidized bed to obtain accurate data for the razor clam. The result is that a slight fluidization to a void fraction between 40-45% gives …
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Application of penetration theory to mass transfer on a sieve tray
… estimations; this discrepancy was attributed to wall effects and differences in froth characteristics.
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Experimental and computational analysis of random cylinder packings with applications
… packing density, the onset of ordering, and wall effects. Orthogonal ordering and layered structures were found to exist at least two characteristic diameters from the wall in cylinder packings. Important applications for cylinder packings include multiphase flow in catalytic beds, heat …
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A Five-Zone Model for Direct Injection Diesel Combustion
… has a single nozzle and greater distance to the wall reducing or eliminating wall effects and jet interaction effects. Interactions between jets and the use of a spray penetration correlation developed for non-reacting jets contribute to inaccuracies in the model.
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Geometry-Aware Modeling of Rough-Wall Turbulence Using Reynolds-Averaged Navier-Stokes (RANS) Frameworks
Turbulent flow over rough walls is widespread in engineering systems and plays a critical role in drag prediction, energy efficiency, and transport processes in internal and external flows. Despite extensive research, the representation of roughness effects in Reynolds-Averaged Navier–Stokes (RANS) …
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The hydraulic transport of high concentration stabilized flow full plant mineral tailings
… 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 between particle and pipe …
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An experimental and theoretical study of the flow about spheres and discs rotating slowly in viscoelastic fluids
… Order fluid. They are also used to estimate wall effects in experimental situations. Tangential and radial velocity profiles are measured for the flow about a sphere rotating slowly in a Newtonian liquid. Velocities are determined from enlarged streak photographs of aluminium particles moving …
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Investigation into the Hydrothermal Treatment of Sugarcane Bagasse under Near- and Supercritical Conditions
… parameters and various additives and their effects on a single product phase. This research examined the influence of temperature, residence time, biomass concentration, and particle size on volatiles production from the hydrothermal conversion of sugarcane bagasse. Temperature had the …
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PERFORMANCE ANALYSIS AND THE EFFECTS OF KEY PARAMETERS IN SOLID PARTICLE BEDS
… beds. The particle-particle collision, particle-wall interaction, and virtual mass force which initiates from particle motion influencing neighboring particles make it very difficult to analyze the problem experimentally and numerically. This work is focused on assessing the performance of the …
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Quantifying Uncertainty In A Measurement-Based Assessment of Relative Biological Effectiveness In Carbon Ion Radiotherapy
… low energy cut-off, counting statistics, wall effects and pulse pile-up. These sources were quantified by statistically introducing uncertainty into the simulated measurements 200 times and sampling the resultant RBE associated with each of the 200 perturbations. The uncertainty introduced …
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The transient motion of a solid sphere between parallel walls
… 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 to the walls and included the centre of the sphere. The transient motion was achieved by releasing the sphere from …
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Numerical Simulation of Unsteady Flows of Physiological Relevance
… of dynamical patterns of pulsating flow, near wall effects, and differential diffusion effects are not well documented. The effect of wall elasticity on the flow has been assumed to be small but no quatification data exist. There are same basic difficulties in studying physiological flow: The …
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Counter-flow Ion Mobility Analysis: Design, Instrumentation, and Characterization
… from power circuit boards, PCBs, (top and bottom walls) and conductive plastic side walls. An inclined electric field was created by applying suitable voltages to multiple electrode traces on the PCBs. This inclined field, when resolved into its x- and y-components, was used to oppose the …
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Simulation of Multi-Component Gas Flow and Condensation in Marcellus Shale Reservoir
… distinctively different under the influence of wall effects and adsorption in organic nano-pores, and also have significant effect on production strategies and stimulation design for Marcellus shale gas reservoirs. This study takes a unique approach that can be applied to commercial simulators …
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Tides, Winds, and Reactive Halogens A Study of Multiphase Chemistry in the Marine Boundary Layer
… reduction in artificial signals/background from wall effects by multiple orders of magnitude across compound volatilities compared to previous low-pressure designs. The t-IMR utilizes an applied electric potential to accelerate ions and subsequent clusters across the IMR cavity, the strength of …
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