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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 46 for “"Viscous Fluids"”.
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High Pressure NMR Studies of Supercooled Viscous Fluids
… and densities of several supercooled viscous fluids have been previously measured as a function of temperature and pressure in order to investigate the adequacy of the modified Debye equation over a large range of viscosities. In this study, a more detailed look was taken at the …
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High Pressure Nuclear Magnetic Resonance Studies of Viscous Fluids
… study of molecular motions in a number of viscous liquids ((eta)(, )>(, )1 poise). Pressure studies are performed in order to examine explicitly the effect of volume on the motional characteristics. Where appropriate, ('13)C and ('2)D NMR are employed to obtain exclusively reorientational …
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Spreading of viscous fluids and granular materials on slopes
… lava flows is studied by considering the flow of viscous fluid released on sloping channels. A scaling analysis, in agreement with analog experiments and field data, offers a practical tool for predicting the advance of lava flows and conducting hazard analysis. A simple and powerful theory …
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n.m.r. Studies of Supercooled Viscous Fluids and Silica Gels (Nmr)
… are used to study the dynamic behavior of viscous fluids ((eta) > 1 Poise) in the supercooled state. The applicability of the hydrodynamic equations to high viscosity systems is investigated at a molecular level in a series of selectively deuterated compounds of varying molecular symmetry …
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Modulation Of Hydrodynamic Forces On Oscillating Submerged Structures In Viscous Fluids
… fabrication, and control of devices operating in viscous fluids. Modulation of the forces and dissipated power by manipulating the hydrodynamics in the vicinity of the structure can thus improve the performance of these devices. In this dissertation, we discuss several fluid-structure interaction …
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Nonlinear wave modulation in an inviscid and viscous fluids-filled thin viscoelastic tube
… blood as an incompressible inviscid fluid and viscous fluid, two mathematical models of nonlinear wave modulation in thin viscoelastic tube are formed through the use of the reductive perturbation method. The equation of fluids used in this research are exact equations where boundary condition …
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Transport and statistical mechanics of flexible chains and clusters of Brownian particles in quiescent viscous fluids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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Qualitative and Quantitative Study of the Flow Physics in the Vicinity of an Oscillating Plate in Viscous Fluids
… harmonic oscillations in a still, Newtonian, viscous fluid. We conduct a comprehensive qualitative and quantitative analysis of the problem for a broad range of values of the parameters of oscillation, including frequency and amplitude, to study the fluid-structure interaction mechanisms …
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The rotor-oscillator flow : searching for coherence amidst chaos
Chaotic mixing of highly viscous fluids is common in many biological and industrial processes. This study aims to gain insight about the properties of such common processes by examining one particular case of viscous, chaotic mixing: the rotor-oscillator flow. For some couplings of the rotor motion …
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Active lubricant-impregnated surfaces
… fields, yet moving highly conductive and viscous fluids remains a challenge. Magnetic fields have been used for droplet manipulation, however the fluid is usually functionalized to be magnetic, and requires enormous fields of superconducting magnets when transitioning to diamagnetic …
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Laminar heat transfer to Newtonian and Non-Newtonian fluids in tubes. Temperature and velocity profiles were determined experimentally for heating and cooling of Newtonian and non-Newtonian fluids in tubes and the results compared with theoretical predictions incorporating a temperature-dependent viscosity.
… and heat transfer characteristics of viscous fluids flowing in tubes under laminar conditions. Particular attention has been given to the effects of the rheological properties and their variation with temperature. A review of problems of this type showed that in spite of the many …
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Signatures of hydrodynamic transport in an electron system
… manner, in many ways resembling the movement of viscous fluids and leading to surprising collective behaviors. Here we explore how the hydrodynamic behavior manifests itself in the electron transport through nanoscale constrictions. Free electron flows through constrictions in metals are often …
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Self-Consistent Conversion of a Viscous Fluid to Particles and Heavy-Ion Applications
… the early stages of a heavy-ion collision is viscous hydrodynamics. Comparing hydrodynamic simulations to heavy-ion data inevitably requires the conversion of the fluid to particles. This conversion, typically done in the Cooper-Frye formalism, is ambiguous for viscous fluids. In this thesis …
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Designing a device to create a metered two-phase mixture
… use of pneumatic cylinders to accomodate more viscous fluids, or greater quantities. Based on mathematical modeling, the design can accommodate a maximum fluid viscosity exceeding 96.3 Pa-s (96,300 cps) through 1/8 NPT pipe with no restriction. A sintered metal filter was also modeled, …
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Modeling and characterization of a voice coil motor
… of a voice-coil motor that will allow viscous fluids to be delivered via a portable needle-free injection device. The chosen motor design features opposing magnets whose flux is channeled across the air gap by a center radial magnet, thus creating a higher flux density in the gap …
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Analysis of the swimming-to-crawling transition of Caenorhabditis elegans in viscous fluid
… by two distinct gaits - swimming when in fluids and crawling when on surfaces. Swimming is characterized by about a twice greater wavelength and about four time greater frequency of undulatory waves, compared with the crawling gait. These mechanisms which generate these gaits are not …
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CFD studies of complex fluid flows in pipes
The flow of rheologically complex fluids in industrial equipment poses a number of challenges, not least from a modelling point of view. Research is needed to further understand and be able to predict the flow behaviour of such materials and to investigate ways of improving their processing. This …
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Intelligent Non-Invasive Thermal Energy Flow Rate Sensor for Laminar and Turbulent Pipe Flows
… different pipe materials, and different viscous fluids. The transient measurements are made on the outer surface of a pipe by using a heat flux sensor and a thin-film thermocouple which are covered by a thin-film heater. A one-dimensional transient thermal model is applied before and …
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Reduced-basis output bound methods for parametrized partial differential equations
… the Stokes problem (e.g flow of highly viscous fluids), and certain nonlinear equations (e.g. eigenvalue problems).
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Optimizing Snake Locomotion on a Plane: A Variational and Analytical Framework for Friction and Normal Force Modulation
… including granular media and low-Reynolds-number viscous fluids, highlighting a universal tendency toward sawtooth-like kinematics in efficient undulatory locomotion. This work provides a unified theoretical foundation for understanding the biomechanics of limbless locomotion and offers guiding …
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