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Showing 1 to 20 of 20 for “"dilute gas"”.
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Concurrent evaporating spray jets in dilute gas-solid pipe flows
Evaporating spray jets into gas-solids suspensions are encountered in many industrial applications. The rapid evaporation of spray jets has significant effects on the gas-solids mixing near the jet nozzle regions, including non-uniform solids concentration dilution, gas/solids temperature …
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The effects of instantons in a finite temperature quantum field theory
… zero temperature. We perform calculations in a dilute instanton gas approximation. We show that in this approximation, instantons increase coupling between the quarks. We then show that the dilute gas approximation is suspect in the zero temperature formalism because divergences occur when …
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Some Problems Connected with the Boltzmann Equation
<p>Consider a dilute gas composed of a very large number of molecules moving in space according to the laws of classical mechanics, and colliding in pairs from time to time. Assume that we can disregard all external effects, such as gravity, so that the motion is completely specified by giving the …
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Efficient numerical methods for solving the Boltzmann equation for low-speed flows
… path to the characteristic length scale of a dilute gas flow, is larger than approximately 0.1, the Navier-Stokes equations are no longer valid. In this case, which is frequently encountered in small-scale flows, one must solve the more general Boltzmann equation. The objective of this work is …
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Aspects of Non-Perturbative Renormalization
… approaches. For the two-dimensional Coulomb gas (which is investigated by a real-space renormalization group method using the dilute-gas approximation), we provide a systematic method for obtaining higher-order corrections to the dilute gas result.
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Nonlocal correlations between freely propagating pairs of atoms
… apparatus to more stably produce ultracold gases of metastable helium. Massive particles such as atoms exhibit a wave-like behaviour at ultracold temperatures, typically requiring micro-Kelvin temperatures for a dilute gas. Laser cooling and trapping techniques in ultrahigh vacuum chambers …
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Nonlocal correlations between freely propagating pairs of atoms
… apparatus to more stably produce ultracold gases of metastable helium. Massive particles such as atoms exhibit a wave-like behaviour at ultracold temperatures, typically requiring micro-Kelvin temperatures for a dilute gas. Laser cooling and trapping techniques in ultrahigh vacuum chambers …
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Semiclassical Methods in Field Theories: The Use of Soliton and Instanton
… the interaction among instantons, examine the dilute gas limit assumption, and compute the vacuum state wave functionals and eigen-energies. We also study the method to generate envelope solutions out of a family of existing instanton solutions.
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Phonon-quasiparticle interactions in dilute solutions of He3 in superfluid He4
… nature of phonon-quasiparticle interactions in dilute solutions of He3 in superfluid He4 and the role they play in determining the linear response prQperties of such solutions are examined. The vertices for phonon scattering and absorption by He3 quasiparticles as well as the effective …
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⁸⁷Rubidium Bose-Einstein condensates in optical lattices
… momentum due to the index of refraction of a dilute gas of atoms has been observed. The recoil frequency was measured interferometrically using a two-pulse Ramsey interferometer. The two pulses were created using a one dimensional optical lattice. By measuring the resulting frequency as a …
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Transport property equations-of-state for reservior fluids and dense gas mixtures
… properties over the entire PVT states, including dilute-gas viscosity, coexistence gas-liquid viscosities and high-pressure-dense fluid viscosity of pure substances, range from hydrocarbons (methane through n-octane), non-hydrocarbon (carbon dioxide, nitrogen), polar fluids (water, alcohols) and …
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Efficient numerical methods for solving the Boltzmann equation for small scale flows
… fluid mechanics fail to accurately describe dilute gas flows when the characteristic lengthscale of the system is on the order of (or smaller than) the molecular mean free path. At these lengthscales, gaseous hydrodynamics may be described by a kinetic description, namely the Boltzmann …
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Manipulating Bose-Einstein condensates with laser light
A dilute gas Bose-Einstein condensate was probed and manipulated by off-resonant laser beams. Spontaneous and stimulated off-resonant light scatterings were studied experimentally. Stimulated, two-photon Bragg scattering was used for spectroscopic measurement of the mean-field energy and of the …
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Discontinuous Galerkin solution of the Boltzmann equation in multiple spatial dimensions
… solution of a kinetic description of small scale dilute gas flows when the Navier-Stokes description breaks down. In particular, it investigates alternative solution techniques for the Boltzmann equation typically used when the Knudsen number (ratio of molecular mean free path to characteristic …
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Fast Sound Propagation in Binary Fluid Mixtures
… binary mixtures). I have studied both dilute (gaseous) mixtures and dense mixtures. In the description of the dynamics of the fluid through the density-density correlation functions, one can introduce modes, which can be thought of as the different channels by which the correlations …
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Feedback Control Theory in Stochastic Dynamical Systems
… that the low density limit can be described as a dilute gas of vehicles with a repulsive core. At the transition to jamming, I observe finite-size effects in a variety of quantities describing the flow and the density correlations, but only if the maximum speed Vmax is larger than a certain value. …
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Contributions Toward Understanding the Effects of Rotor and Airframe Configurations On Brownout Dust Clouds
… Basset-Boussinesq-Oseen equations appropriate to dilute gas particle suspensions of low Reynolds number Stokes flow. Important aspects of particle mobility and uplift in such vortically driven dust flows were modeled, which included a threshold-based model for sediment mobility and bombardment …
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Metalorganic chemical vapor deposition of metal oxides
… process parameters such as bubbler temperature, dilute gas flow rates, deposition temperature, and total pressure. Either pure RuO₂, pure Ru, or a RuO₂ + Ru mixture was obtained under different deposition conditions. As-deposited pure RuO₂ films were specular, crack-free, and adhered well on the …