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 20 for “"transition regime"”.
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Heterogeneous combustion of condensed particles in transition regime
… particle is developed accounting for the transition regime of heat and mass transfer. The model assumes formation of condensed products and reaction rate controlled by the transport of oxidizer to the particle surface. The model is based on the Fuchs' limiting sphere approach. Calculations …
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Heat transfers and density distribution measurements between parallel plates in the transition regime, by William P. Teagan.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1967.
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Valence transition and superconductivity in the extended periodic Anderson model
… that the model in one dimension shows a valence transition, which becomes sharper, when the energy of the f level approaches the Fermi level. The transition becomes also enhanced, when the hybridization V between the localized and conduction electrons decreases, for the case that the total number …
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NUMERICAL ANALYSIS OF CO-FLOWING IMMISCIBLE LIQUIDS IN CO-AXIAL MICROTUBES
… for the boundaries between the dripping, transition and jetting regimes. Additional correlations are also developed for the radius and formation frequency of disperse droplet in the dripping regime and the transition regime, when the total volume of the satellite droplets is less than 1% …
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The Effects of Rarefaction and Thermal Non-Equilibrium on a Blunt Body and a Bicone in Hypersonic Flow and Their Shape Optimization for Reducing Both Drag and Heat Transfer
… since they need to travel through different flow regimes due to changes in the density of the atmosphere with altitude. Some of the key characteristics associated with hypersonic flow are extremely high temperatures and heat transfer to the wall of the spacecraft. At these temperatures, the …
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Experimental analysis of flow and turbulence characteristics in oscillatory boundary layers from LDV measurements
… Unlike steady boundary layer flows, the flow regime and bed roughness character of oscillatory flows change in time during the oscillation, a characteristic that introduces a high degree of complexity in the analysis. Experimental work in this topic started in the 1960s followed by numerical …
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A Microstructural Model for a Proton Exchange Membrane Fuel Cell Catalyst Layer
… diffusion within the catalyst layers lies in the transition regime between bulk and Knudsen diffusion. Calculated effective diffusivities within the pore space of the model were shown to be relatively insensitive to changes in the catalyst layer composition and construction rule set other then …
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Efficient simulation of molecular gas transport for micro- and nanoscale applications
… simulating the Boltzmann transport equation in regimes typically encountered in nanotechnology applications. These transport regimes are characterized by non-vanishing Knudsen numbers, preventing simple analyses based on the Navier-Stokes equations; and also by small departures from equilibrium …
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Flexigami : folded polygonal unit cells for deployable metamaterials and mechanisms
… than 10% of their deployed volume. Within this transition regime, the force-displacement curve of each cell can be tuned to exhibit a smooth compression behavior or an instability followed by a self-reinforcing response. We use finite-element models complemented by analytical and computational …
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Paths to peace: conflict management trajectories in militarized interstate disputes
… a random model. After using a series of Markov transition (regime-switching) models to evaluate conflict management behavior within militarized interstate disputes in the 1946-2001 period, this study concludes that third-party intervention efforts inform one another. More specifically, …
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Desalination of water by vapor transport through hydrophobic nanopores
… interfaces. We then expand the model to transition regime where molecular diffusion coexists with the rarified gas transport. Effect of nanopore geometry, salinity, temperature, applied pressure, and interfacial reflection probability on the transport of water molecules through the …
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Determining the Reaction Zone Length in Shock Initiated PETN
… work has been on steady state behaviour, so the transition regime before steady state is particularly poorly understood. The research described in this thesis was undertaken in order to characterise the reaction zone length and wave curvature during the evolution from initiation to steady state. …
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Fracture characterization from seismic measurements in a borehole
… show that the tubewave measurements made in the transition regime from low to high frequency can constrain fracture compliance, aperture and length, while measurements made in the high-frequency regime can place a lower bound on fracture compliance. Analysis of field data suggest a large …
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Quasi-particle Breakdown and Heat Transport in a Homogeneous Strongly-interacting Fermi Gas
… of transport, critical phenomena near phase transitions, and novel states of matter predicted in a narrow range of densities. Radio-frequency (rf) spectroscopy provides a powerful tool for probing singleparticle excitations in quantum gases. In particular, we employ it to study the thermal …
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Technology Demonstration of a Megawatt-Class Integrated Motor Drive for Aircraft Propulsion
… flow limits constrain its operation to the flow transition regime. Synchronous excitation of the spindle modes via the destabilizing electromagnetic rotor-stator forces is a key challenge for the overhung rotor architecture due to the absence of an effective source of damping. The spindle root …
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Experiment and modeling : ignition of aluminum particles with a CO2 laser
… of a micron sized metal particle involves the transition regime heat transfer. A modified Fuchs model was used to describe the heat transfer in this study. In addition to dry air environment, the experimental technique was also used with other oxidizing environments, including O_2, H_2O, CO_2 …
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Experimental study and characterization of bubble behaviors in the orifice-induced hydrodynamic cavitation
… process of orifice-induced cavitation and transitional bubble behaviors. The transition from non-cavitation to fully developed cavitation was carefully studied. Cavitation bubble clouds were observed at orifice, indicating the inception of cavitation. The number of bubbles produced were …
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Kinetic algorithms for non-equilibrium gas dynamics
… gas-dynamic simulations in the continuum transition regime are considered. In particular, large departures from translational equilibrium are modeled using algorithms based on the Burnett equations instead of the Navier-Stokes equations. Here, the same continuum formulation of the …
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High temperature spectroscopic measurements of aluminum combustion in a heterogeneous shock tube
… low as, or lower than 0.3, in conditions in the transition regime between kinetic and diffusion limited particles. This anomalous result, as well as observed increases of burn time with pressure when using water vapor as an oxidizer had been attributed to a pressure dependence on ignition of …
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Multiscale modeling of moisture transport coupled with quality changes in selected foods
… moisture sorption, swelling/shrinkage, and glass transition were incorporated using hybrid mixture theory (HMT)-based multiscale modeling approach (Chapter 2). It is important to understand the viscoelastic properties of cereals since they affect product texture as a result of moisture transport. …