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 81 for “"momentum flux"”.
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The momentum flux in two-phase flow.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1966. Sc.D.
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Angular momentum flux in the formation of the solar system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1964.
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A parametric study of the momentum flux at the air-sea interface
A modified eddy correlation technique is applied to data obtained from a field experiment conducted in the Bight of Abaco during the Spring of 1990. The experiment yielded 3408 30 minute records of turbulent wind data sampled at 5 Hz. Wind stress estimates were successfully calculated for 3182 of …
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An investigation of wave-induced momentum flux through phase averaging of open ocean wind and wave fields
… wind-driven, surface waves on the vertical flux of horizontal momentum in the marine surface layer over open ocean conditions. Through a procedure which involves phase averaging the wind fields at the period of the dominant waves, the wave-induced component of the atmospheric fluctuations is …
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An investigation of wave-induced momentum flux through phase averaging of open ocean wind and wave fields
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1996.
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Dynamical Processes of Gravity Waves Propagation and Dissipation, and Statistical Characteristics of Their Momentum Flux in the Mesosphere and Lower Thermosphere
… and equatorward during winter. The estimated momentum fluxes show a clear anti-correlation with background winds. Secondly, intermittency of gravity waves near mesopause region is studied. The concept of intermittency is originally from the factors used in wave parameterization schemes to …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… of the influence of surface waves on momentum exchange. A quantitative comparison of direct covariance friction velocity measurements to bulk aerodynamic and inertial dissipation estimates indicates that both indirect methods systematically underestimate the momentum flux into …
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An investigation of momentum exchange parameterizations and atmospheric forcing for the Coastal Mixing and Optics Program
… of the influence of surface waves on momentum exchange. A quantitative comparison of direct covariance friction velocity measurements to bulk aerodynamic and inertial dissipation estimates indicates that both indirect methods systematically underestimate the momentum flux into …
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Flow structure of an asymmetric large river confluence
… that responds dynamically to changes in momentum flux ratio of the incoming flows and to the effects of secondary circulation cells. The scour hole location and geometry within this confluence hydrodynamic zone are subject to change depending on the relative momentum of the two rivers …
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Experimental investigation of liquid fragmentation in hypersonic cross flow
… of the injector geometry and the effect of momentum flux ratio are studied throughout the experimental campaign. Droplet size measurements are analyzed and treated to characterize the atomization process of the liquid jet. The Sauter Mean Diameter and the standard deviation of the droplet …
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Cooling hole geometry and turbulence effects on the early suction side surface of a turbine vane
… averaged film cooling effectiveness for similar momentum flux ratios at medium and high turbulence (𝑇𝑢 ≥ 4%). The impact of the turbulence is related to both the upstream leading edge holes and the rate of diffusion imposed to the coolant from the different geometries. The fan-shaped geometries …
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Experimental Investigation of a Flush-Walled, Diamond-Shaped Fuel Injector for High Mach Number Scramjets
… radius of 3.54 mm and a jet-to-freestream momentum flux ratio of 1.04. Second, a lower mass flow rate of 1.5 g/s corresponding to an effective ratio of 2.35 mm and a jet-to-freestream momentum flux ratio of 0.49 was studied. The diamond injector was tested both aligned with the freestream …
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The Effect of Blade Row Interaction on Rotor Film Cooling
… by up to 31% with cylindrical holes at a low momentum flux ratio, because the response to perturbations is non-linear. Cylindrical holes at a high momentum flux ratio, and fan-shaped holes, are robust to unsteadiness because they respond linearly. Non-film-resolved computations are used to …
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Active control of tip clearance flow in axial compressors
… jet normal to the mean flow with zero net mass flux), Directed Synthetic Jet (DSJ; injection roughly aligned with the mean flow), and Steady Directed Jet (SDJ), mounted on the casing wall. The objective is to affect the following measures: (1) reduction of tip leakage flow rate, (2) mixing …
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The impact of wave-modified wind stress in an ocean circulation model
A wave-related momentum flux parametrization is introduced in the ocean circulation model HYCOM. The physical process driving this parametrization is the growing and dissipation of the surface wave field. Two numerical experiments are conducted for the South Atlantic: one with the new wave effect …
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An analysis of the flow disturbance due to gaseous secondary injection into a rocket nozzle
… analysis is based upon a consideration of the momentum flux of the primary and secondary flows and the under-expansion of the momentum flux of the secondary jet. The analysis results in two characteristic dimensions of the effective body for a particular flow condition. The two characteristic …
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Rates and patterns of temperature mixing at a small stream confluence under variable incoming flow conditions
… understood. This study examines the influence of momentum flux ratio, total discharge, and density differences between incoming flows on mixing at a small stream confluence. Temperature data reveal that rates and patterns of mixing depend on event-specific combinations of the three factors. The …
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Experimental Studies of Injector Array Configurations for Circular Scramjet Combustors
… freestream Mach number, and jet-to-freestream momentum flux ratio on the fuel-air mixing process. Helium, methane, and air injectants were studied to vary the injectant molecular weight over the range of 4-29. All of these experiments were performed to support the needs of an integrated …
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Velocity-ion temperature gradient driven modes and angular momentum transport in magnetically confined plasmas
… thesis, we consider the phenomenon of angular momentum transport in magnetically confined plasmas. Relevant experiments and theoretical developments are presented in order to motivate the derivation of a modified version of the three-field nonlinear Hamaguchi-Horton equations. The equations are …
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The fluvial dynamics of confluent meander bends
… environment that responds to changes in momentum-flux ratio. Flow from the tributary deflects high-velocity flow and helical motion in the curving main river toward the inside of the bend, inducing bed scour and inhibiting point-bar development. The high junction angle forces the …
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