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.
Results
Showing 1 to 20 of 35 for “"fluid density"”.
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Vibrational methods applied to NDT testing and fluid density measurement
… found to be applicable to the development of fluid measuring transducers. The vibrational spectra of thin rectangular bars were used for the NDT work. A machined cut in a bar had a significant effect on the spectrum but a genuine crack gave an unambiguous response at high amplitudes. This was …
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Development and Application of a Drilling Hydraulics Simulator Including Pressure and Temperature Dependent Fluid Density and Rheology Behavior
… the desired flow rate. In the annular space, the fluid pressure must be kept in the planned range to avoid a kick or damaging the formation. This thesis describes the creation and theory of a drilling hydraulics simulator to calculate pressure using standard drilling engineering inputs, …
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Predicting the anomalous density of a dense fluid confined within a carbon nanotube
The equilibrium density of fluids under nanoconfinement can differ substantially from their bulk density. Using a mean-field approach to describe the energetic landscape near the carbon nanotube (CNT) wall, we obtain analytical results describing the lengthscales associated with the layering …
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Meshless Local Petrov-Galerkin method with Rankine source solution for two-dimensional two-phase flow modelling
… proposed to simulate 2D flows of two immiscible fluids. The model is applicable to fluids with a wide range of density ratio from 1.01 to 1000, capable of dealing with violent flow situations (e.g. breaking waves) and maintaining the sharp discontinuity of properties of the fluids at the …
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Electromechanical resonators as measuring transducers
… applications. Designs for the measurement of fluid density and tension have been produced. The principle of the design of the resonator for fluid density measurement is a thin gap (trapping a lamina of fluid) between its two members which vibrate in antiphase.An analysis of the inter action …
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Monte Carlo computer simulation of the Lennard-Jones and Stockmayer fluid phase diagrams
The isotherms of the Lennard-Jones fluid and the Stockmayer fluid are calculated by Monte Carlo computer simulation using the constant NpT ensemble. Empirical coefficients are determined for a truncated virial equation of state fitted to our data. Spinodal points are located for each temperature …
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Existence and Uniqueness of a solution to a flow problem about a Rotating Obstacle at low Reynolds number
… impermeable cylindrical rigid body in the fluid is studied. The model is constructed in a manner that the equations describe a system in a frame attached to the obstacle.The system of the governing equations is constructed on the basis of conservation of angular momentum of the rigid body …
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Wetting Phenomena Near the Melting Curve
… study of the location of the hard sphere crystal-fluid phase transition and equilibrium wetting states for systems in contact with various hard substrates was undertaken using Monte Carlo (MC) and molecular dynamics (MD) techniques. Through the use of MD the phase transition was found to occur at …
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Biomass reforming processes in hydrothermal media
… the strongly attenuating 1H2O form of water, fluid density changes resulting from flow pattern changes were also apparent.
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Molecular Dynamics Study of Nano-confinement Effect on Hydrocarbons Fluid Phase Behavior and Composition in Organic Shale
… a complex nanopore structure, in which reservoir fluids are now encountered, instigate further investigation of fluid phase behavior and composition, and challenge conventional macroscale reservoir simulation predictions. Moreover, the unusual high temperatures and pressures have increased the …
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Modeling of mechanical energy dissipation of low-dimensional resonators
… or phonons and extrinsic dissipation due to a fluid environment. In this context, low-dimensional resonators need special attention because the dissipation cannot be explained using the existing continuum theories. Due to atomic thickness, sub-micron dimension, and mega- to gigahertz …
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The effect of testing conditions on lost circulation materials' performance in simulated fractures
… It is not only the cost of the drilling fluid that is lost into the formation but also the costs of subsequent problems that can be higher than the cost of the drilling fluids. LOC also possibly leads to a serious risk of blowout incident.</p><p>Lost circulation materials (LCM) are …
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Dynamic modeling and control strategies for a micro-CSP plant with thermal storage powered by the Organic Rankine cycle
… with the discontinuities in the working fluid density derivative present during such rapid phase changes. To the author's knowledge, this is the first model capable of continuously simulating through startup and shutdown in addition to coupling a dynamic thermo-dynamic model of the power …
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A continental shelf bottom boundary layer model : the effects of waves, currents, and a movable bed
… resulting unsteady conservation equations for fluid momentum, fluid mass, and suspended sediment mass. The wave velocity, current velocity, and suspended sediment concentration profiles predicted by the simultaneous solution of the conservation equations require the physical bottom roughness …
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Time-Lapse Variations of Multi-Component Electrical Resistivity Measurements Acquired in High-Angle Wells
… permeable formations and large contrasts of fluid density and viscosity. Some efforts have been made to study these effects, but the actual spatial distribution of fluid saturation due to invasion has not been considered in previous works. We use a commercial multi-phase fluid-flow simulator …
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Numerical solutions of the general relativistic equations for black hole fluid dynamics
… and allowing for the perturbation of the fluid density upstream of the black hole. We will then analyze the results of the study, and present the complete set of results on a DVD accompanying this thesis.
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Numerical analysis of a shear ram and experimental determination of fracture parameters
… depths in combination with the high drilling fluid density affect the BOP's ability to shear. This study investigates all stages of the shearing process and attempts to optimize the geometry of the shear blades. In order to do that, simulations are conducted with Finite Element Models (FEM) by …
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Krylov Subspace Methods with Fixed Memory Requirements: Nearly Hermitian Linear Systems and Subspace Recycling
… arising in a Newton iteration applied to fluid density functional theory and present some numerical experiments. In the second project, we extend the methods of subspace recycling to a family of linear systems differing only by multiples of the identity. These problems arise in the theory …
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The Viscosity and Thermal Conductivity of Heavy Oils and Solvents
… cuts and pure hydrocarbons. The Expanded Fluid (EF) and the Generalized Walther (GW) viscosity models were updated to predict the viscosity of whole and diluted crude oils and their fractions (such as deasphalted oils). The EF model is suitable for process simulation and is applicable …
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A molecular theory of the Stokes-Einstein relationship
… of interaction between the particle and the fluid particles, we recover exactly the hydrodynamic results for the VACF and the AVACF for both slip and stick boundary conditions in compressible and incompressible fluids. Furthermore, in the case of continuous potentials, we obtain the correct …
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