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 30 for “"Dense gas"”.
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Dense gas effects in a converging-diverging nozzle
… so large that the fundamental derivative of gasdynamic is negative over a finite range of pressures and temperatures. Three general classes of flow are delineated which include two nonclassical types in addition to the usual classical flows; the latter are qualitatively similar to those of a …
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The dynamics of steady supersonic dense gas flows
A weak shock theory is developed which allows for dense gas effects when the fundamental derivative of gas dynarnics, Γ , becomes small and possibly negative. The nonclassical behavior in these negative Γ regions has potential applications in turbomachinery design. The weak shock development …
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Transport theory of dense gas systems with attractive forces.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1971
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Dynamics of dense gas-star systems : Black holes and their precursors
This thesis embraces several aspects of theoretical stellar dynamics in clusters, both analytically and numerically. We try to elucidate the phenomena currently observed in all types of galaxies, including AGNs and quasars, some of the most powerful objects in the universe. The interactions between …
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Transport property equations-of-state for reservior fluids and dense gas mixtures
… 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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Dynamic behavior of unsteady turbulent motion in pipe flows of dense gas-solid suspensions
Unsteady stratified motions in dense gas-solid suspension in horizontal pipe flows at low velocities have been observed, but the means for predicting these motions are lacking. For a dense suspension, the effects of particle-particle interaction, the damping of fluid motion by particles and the …
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High-Resolution Imaging of Dense Gas Structure and Kinematics in Nearby Molecular Clouds with the CARMA Large Area Star Formation Survey
This thesis utilizes new observations of dense gas in molecular clouds to develop an empirical framework for how clouds form structures which evolve into young cores and stars. Previous observations show the general turbulent and hierarchical nature of clouds. However, current understanding of the …
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Transonic aerodynamics of dense gases
Transonic flow of dense gases for two-dimensional, steady state, flow over a NACA 0012 airfoil was predicted analytically. The computer code used to model the dense gas behavior was a modified version of Jameson's FLOS2 airfoil code. The modifications to the code enabled modeling the dense gas …
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Data Analysis of the Cosmic Microwave Background
The early universe consisted of a dense, hot and ionised gas of electrons, protons, neutrons, some light atomic nuclei and photons. The universe at that time was optically thick as the photons could not travel very far before being scattered on electrons in the dense gas. The temperature was too …
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Understanding star formation at early stages in the filamentary era
… (CARMA) observatory, we have identified seven dense gas cores in this region and discussed the role of initial turbulence. The gas cores require an external pressure of 10^8 K cm^-3 to be bound to form possible seeds for future protostars. Furthermore, to understand massive star formation, we …
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Supersonic flows of Bethe-Zel'dovich-Thompson fluids in cascade configurations
We examine the dense gas behavior of Bethe-Zel'dovich-Thompson (BZT) fluids in two-dimensional, steady, inviscid, supersonic cascade configurations. Bethe-Zel'dovichThompson fluids are single-phase gases having specific heats so large that the fundamental derivative of gas dynamics, Γ, is negative …
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Compressible flows of dense gases in boundary layers
… and numerics necessary for the analysis of dense-gas boundary-layer flows over arbitrarily shaped two-dimensional bodies are developed. The governing equations are derived from the Navier-Stokes-Fourier equations for a general fluid. A numerical method based on the second-order Davis-coupled …
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Global existence in L1 for the square-well kinetic equation
… to model the kinetic theory of a moderately dense gas with intermolecular potential. The existence of solutions to the Cauchy problem in <i>L</i>¹. global in time and for arbitrary initial data. is proved. A simple derivation of the square-well kinetic equation is given. Lewis's method is …
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The Evolution of Massive Young Stellar Objects in the Large Magellanic Cloud
… Australia Telescope Compact Array, we imaged the dense gas around a subsample of our sources in the HII complexes N44, N105, N113, and N159 using HCO+ and HCN as dense gas tracers. We find that the molecular material in star forming environments is highly clumpy, with clumps that range from …
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Multiple Velocity Component Analysis of Ammonia Spectral Lines in High-Mass Star-Forming Regions
… to produce massive stars. Previous analyses of dense gas in nearby low-mass star-forming regions have identified the presence of multiple coherent velocity structures overlapping along the line of sight. We perform a multiple component analysis of ammonia (NH3) gas observations from a Green Bank …
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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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Aktyvaus branduolio tėkmės įtaka juodosios skylės maitinimui /
… conclusions were made: 1. As a molecular gas cloud falls into the black hole, elliptical gas disks are formed. Throughout the entire evolution period, the ellipticity is maintained. The dense gas ring prevents the newly formed stars from escaping the influence zone of the SMBH and has the …
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Models of Dust and Gas Tori in Active Galactic Nuclei
… understanding of the distribution of dust and gas in the innermost parsecs of Active Galactic Nuclei. Unified schemes demand a circum-nuclear disk or "torus" to geometrically unify two separate classes of observed objects (face-on and edge-on view onto the torus). In a multi-step approach, we …
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