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Determination of fluid viscosities from biconical annular geometries: Experimental and modeling studiesRondon, Nolys Javier 15 May 2009 (has links)
Knowledge of viscosity of flow streams is essential for the design and operation of
production facilities, drilling operations and reservoir engineering calculations. The
determination of the viscosity of a reservoir fluid at downhole conditions still remains a
complex task due to the difficulty of designing a tool capable of measuring accurate
rheological information under harsh operational conditions. This dissertation presents
the evaluation of the performance of a novel device designed to measure the viscosity of
a fluid at downhole conditions.
The design investigated in this study addresses several limitations encountered in
previous designs. The prototype was calibrated and tested with fluids with viscosities
ranging from 1 to 28 cp under temperatures ranging from 100 to 160oF. Viscosity
measurements were validated with independent measurements using a Brookfield
viscometer. We proposed a mathematical model to describe the performance of the
device for Power-law fluids. This model describes the response of the device as a function of the rheology of the fluid and the physical dimensions of the device.
Experimental data suggests the validity of the model to predict the response of the
device under expected operating conditions. This model can be used to calculate optimal
dimensions of the device for customized target applications.
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Viscosities of natural gases at high pressures and high temperaturesViswanathan, Anup 17 September 2007 (has links)
Estimation of viscosities of naturally occurring petroleum gases provides the information
needed to accurately work out reservoir-engineering problems. Existing models for
viscosity prediction are limited by data, especially at high pressures and high
temperatures. Studies show that the predicted viscosities of natural gases using the
current correlation equations are about 15 % higher than the corresponding measured
viscosities at high pressures and high temperatures.
This project proposes to develop a viscosity prediction model for natural gases at high
pressures and high temperatures.
The project shows that commercial gas viscosity measurement devices currently
available suffer from a variety of problems and do not give reliable or repeatable results.
However, at the extremely high pressures encountered in high pressure and high
temperature reservoirs, the natural gases consist mainly of methane as the hydrocarbon
constituent and some non-hydrocarbon impurities. Available viscosity values of methane were used in the development of a correlation for predicting the viscosities of naturally
occurring petroleum gases at high pressures and high temperatures. In the absence of
measurements, this correlation can be used with some confidence.
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Piston-driven flow of highly concentrated suspensions /Lukner, Ralf Bernhard, January 1999 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 228-233). Available also in a digital version from Dissertation Abstracts.
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Uniqueness and existence results on viscosity solutions of some free boundary problemsKim, Christina. January 2002 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2002. / Vita. Includes bibliographical references. Available also from UMI Company.
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Polymerization and characterization of poly(ethyl methacrylate)Bakioğlu, Levent. January 2003 (has links) (PDF)
Thesis (M.S.)--Middle East Technical University, 2003. / Keywords: Ethyl methacrylate, atom transfer radical polymerization, gamma irradiation, free radical polymerization, viscosity.
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Singular limits of reaction diffusion equations of KPP type in an infinite cylinderCarreón, Fernando 28 August 2008 (has links)
In this thesis, we establish the asymptotic analysis of the singularly perturbed reaction diffusion equation [cataloger unable to transcribe mathematical equations].... Our results establish the specific dependency on the coefficients of this equation and the size of the parameter [delta] with respect to [epsilon]. The analyses include equation subject to Dirichlet and Neumann boundary conditions. In both cases, the solutions u[superscript epsilon] converge locally uniformally to the equilibria of the reaction term f. We characterize the limiting behavior of the solutions through the viscosity solution of a variational inequality. To construct the coefficients defining the variational inequality, we apply concepts developed for the homogenization of elliptic operators. In chapter two, we derive the convergence results in the Neumann case. The third chapter is dedicated to the analysis of the Dirichlet case. / text
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Uniqueness and existence results on viscosity solutions of some free boundary problemsKim, Christina 16 May 2011 (has links)
Not available / text
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An investigation of the rheological behaviour of lubricants using the optical impact viscometry technique黃柏林, Wong, Pat-lam, Patrick. January 1990 (has links)
published_or_final_version / Mechanical Engineering / Doctoral / Doctor of Philosophy
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Design and construction of a computerized die swell apparatusSamara, Mazen Kamil. January 1985 (has links)
No description available.
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The role of functional properties of dietary fiber in the control of nutrient flow and intestinal health in pigsHooda, Seema Unknown Date
No description available.
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