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 23 for “"bulk viscosity"”.
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Determing the Properties of Dense Matter: Superconductivity, Bulk Viscosity, and Light Reflection in Compact Stars
… matter to vibrational modes by calculating the bulk viscosity from purely leptonic processes. We find that for hot neutron stars, the bulk viscosity due to leptons is very small compared to the bulk viscosity due to nucleons, but for cold neutron stars, the leptonic component is dominant. …
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Three Problems Involving Compressible Flow with Large Bulk Viscosity and Non-Convex Equations of State
… two problems, we consider fluids which have bulk viscosities which are much larger than their shear viscosities. In the last problem, we examine steady supersonic flows of a Bethe-Zel'dovich-Thompson (BZT) fluid over a thin airfoil or turbine blade. BZT fluids are fluids in which the …
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Probing the phases of cold ultra-dense matter using neutron star physics
… important because transport properties such as viscosity, in addition to depending on the equation of state of matter, also depend on the low-energy degrees of freedom and therefore can discriminate between different phases of dense matter more efficiently. In the first part of this thesis we …
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Local Viscosity and Environment on the Nanometer Scale
… and used to understand the local environment and viscosity. The rotational correlation time constants by the fluorescence anisotropy provide the information on the hydrodynamic volume and local viscosity near the probe. Instead, the fluorescence lifetime does the local environment near the probe …
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Quantum Transport and Scale Invariance in Expanding Fermi Gases
… of the energy and interaction dependent shear viscosity $\eta$ and bulk viscosity $\zeta$ in the hydrodynamic expansion of a two-component Fermi gas near a broad collisional (Feshbach) resonance. This expansion also provides a precise test of scale invariance and an examination of local thermal …
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Exact non-equilibrium solutions of the Einstein-Boltzmann equations
… tilted solutions and solutions with non-zero bulk viscosity. Exact entropy results are derived for the isotropic solution showing that the H-theorem is satisfied. The non-equilibrium isotropic solution has vanishing non-equilibrium pressures and fluxes. The FRW and Bianchi I solutions are used …
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Anwendung des Lattice-Boltzmann-Verfahrens zur Berechnung strömungsakustischer Probleme
… by calculation of phase velocity and effective viscosity for sound waves. Schemes with nine velocities in two dimensions and nineteen velocities in three dimensions are considered. For each of these a single relaxation time model (LBGK-model) and a multiple relaxation time model (MRT) is …
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Subcritical time-dependent response of Berea sandstone
… and undrained compression tests. Both shear and bulk viscosity are calculated to track changes across different loading stages. Additionally, acoustic emission is monitored throughout each experiment to observe the evolution of microcracks as the load increases. The evolution of permeability …
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Neuro-Fuzzy Classification of Submarine Lava Flow Morphology On the Galapagos Spreading Center, 92W
… petrography to determine the crystallinity and bulk viscosity of basaltic lava flow samples from the GSC. I show that bulk viscosity can vary significantly within lava flow fields and with relatively small variations in crystallinity. Using quantitative textural analysis techniques, I find …
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Kinetic algorithms for non-equilibrium gas dynamics
… Both a rotational relaxation model and a bulk-viscosity model have been considered for simulating rotational non-equilibrium. Results are presented for hypersonic normal shock calculations in argon and diatomic nitrogen and comparisons are made with Direct Simulation Monte Carlo (DSMC) …
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Structural Vulnerability of Coastal Bridges Under Hurricane Conditions
… displacement hourglass scaling factor, and bulk viscosity scaling factors) and configurations (mesh size) and to determine optimal filter designs. This work resulted in recommendations for conducting numerical analyses, summarizing best practices for modeling coastal bridges under wave …
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Universal quantum viscosity in a unitary Fermi gas.
… the first measurement of the quantum shear viscosity in a6Li unitary Fermi gas, which is also the first measurement of a transport coefficient for a unitary Fermi gas. While equilibrium thermodynamic quantities have been theoretically and experimentally studied for the past few year, the …
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Dynamics of primordial phase transitions, primordial magnetic fields, and Big Bang nucleosynthesis
… is studied. (5) I have examined the role of bulk viscosity in the inflationary universe during the GUT phase transition and its effects on cosmological inflation, density fluctuations, and entropy production. Finally, I have investigated the role of gravitation in an inflationary universe and …
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Primary photoprocesses of light-activated antiviral and antitumor agents, hypericin and hypocrellin
… a deuterium isotope effect and a strong solvent bulk viscosity dependence. Such behavior is rationalized by postulating that the excited-state tautomerization pathway, besides the proton stretch, involves at least one other reaction coordinate such as molecular skeletal motion or even …
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Dynamics of Nanoparticles in Complex Media
… but deviate from predictions made from the bulk viscosity of the polymer solutions. These results indicate that particle dynamics are coupled to the polymer dynamics and highlight the importance of segmental motion of polymer chains on the long-time diffusivity of nanoparticles whose size is …
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Understanding Structure-Property Relationships for Impact Polystyrene
… varied between 5-15 wt% of the polybutadiene. Bulk viscosity behavior was measured at 50 °C ranging in shear rate from 100 s-1 to 1000 s-1. The effect of block copolymer and random copolymer compatibilizers on controlling the structure and viscoelasticity of impact polystyrene was investigated …
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Impact of ingredient interactions on the physico-chemical stability of milk protein-stabilised oil-in-water emulsions
… and depletion interactions on the one hand, and bulk viscosity effects on the other hand. Anionic polysaccharides, such as pectins, were used to improve the stability of protein-stabilised emulsions around the protein’s iso-electric point by adsorption onto the interfacial protein layer, …
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Molecularly thin rheological and contact interfaces
… layer can provide depends on temperature, viscosity of the lubricant, sliding velocity and radius of gyration of the lubricant molecules. This study shows that viscosity has the greatest effect on the load bearing capacity of the molecularly thin lubricant. Thus, by controlling the flash …
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Diffusion Of Gold Nanoparticles In Synthetic And Biopolymer Solutions
… length scale for the NPs experiencing nanoviscosity or macroviscosity. </p> <p>In BSA-phosphate buffer solutions, we observed a monolayer formation at the NP surface with a thickness of 3.8 nm. The thickness of the adsorbed layer was independent of NP size. Best fit was obtained by the …
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The Effective Field Theory Approach to Fluid Dynamics
… via three parameters only, which correspond to bulk viscosity, shear viscosity, and---in the presence of a conserved charge---heat conduction. Using our methods we re-derive the Kubo relations for these transport coefficients.
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