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 43 for “"Viscous dissipation"”.
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Effects of viscous dissipation on hydrodynamic stability of viscoelastic fluids
… stability analysis for the effects of viscous dissipation, in plane Couette flow heated from below. All physical properties are assumed constant except the density in the body-force term of the momentum equation. Critical and marginal Rayleigh numbers are demonstrated for a variety of …
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Graetz problem for slip flow in a channel in the presence of axial conduction, viscous dissipation and flow work
… 0.1. Our analysis includes the effects of viscous dissipation, flow work, and axial heat conduction. A series solution is used to solve for the temperature distribution and provide predictions for the Nusselt number. It is found that inclusion of axial conduction increases both the …
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Efecto de la disipacion viscosa en la condensacion de vapor sobrecalentado
Studies viscous dissipation effects in the condensation heat transfer. Laminar film condensation of a superheated vapour, in the presence of a non-condensable gas, for forced flow over an horizontal, isothermal flat plate ata constant temperature, is analyzed. Condensation of pure vapour is treated …
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Thermally Developing Electro-Osmotic Convection in Circular Microchannels
… addition to Joule heating as an energy source, viscous dissipation is also considered. The results predict that for decreasing a/lambda_d, the local Nusselt number decreases for all axial positions and the thermal development shortens for both wall boundary conditions. Viscous dissipation has …
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Entropy generation in fluid mixing
This thesis describes the processes of viscous dissipation in two generic situations for mixing flows. The objective is to illustrate, with simple examples, details of the entropy generation processes that are captured in an overall manner by a control volume analysis. The two situations are …
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Pattern formation in fluid injection into dense granular media
… grain displacement-dominated regime, and (iv) a viscous fingering-dominated regime. These distinct failure/flow regimes emerge as a result of competition among various energy dissipation mechanisms, namely, viscous dissipation through infiltration, dissipation due to grain displacements, and …
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Nonlinear dynamics of three-dimensional solitary waves
… = 27r/kmin = 1.71 cm. In this instance, ignoring viscous dissipation, cmin is known to be the bifurcation point of two-dimensional (plane) and three-dimensional (fully localized) solitary waves, often referred to as "lumps"; these are nonlinear disturbances that propagate at speeds below cmin …
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Performance investigation of various cold thermal energy storages
… generation accompanying phase change, although viscous dissipation losses were included. Energy efficiencies were well over 99% for all cases, while exergy efficiencies ranged from 70% to 92%. By far, the most influential variable was the inlet HTF temperature; higher efficiencies resulted from …
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Hydromagnetic radiative effect on water, kerosene based on single walled carbon nanotubes induced by a stretching/shrinking sheet with viscous-ohmic dissipation
… stretching/shrinking sheet in the presence of viscous dissipation, thermal radiation and Ohmic heating is investigated numerically.The similarity transformation reduces the time-independent boundary layer equations for continuity, momentum and energy into a set of coupled ordinary differential …
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A miniature, broadband acoustic spectrometer : design of a unified attenuation model, device development, and experimental performance
… physics. Classical attenuation is dominated by viscous dissipation and irreversible heat conduction. Nonclassical attenuation arises from the thermal relaxation between internal and external degrees of freedom for each constituent molecule. Currently, we are not aware of any commercial gas …
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The Development of a Fluid Consistency Transducer
… sensor: (a) inertial or stiffness loading (b) viscous dissipation of energy stored (c) acoustic radiation of energy stored. Of these, acoustic radiation has undesired interactions due to back reflections and gas bubbles. It must therefore be minimised. By using low frequencies, the radiation …
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Adjoint-based optimization for inkjet printing
… no acoustic oscillations and equations for thermoviscous acoustic oscillations with no mean flow. This thesis concerns two types of optimal control problems. The optimal control problem of the first type is finding a velocity profile of the piezo-electric actuator that eliminates residual …
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Penetration of Surfactant Solutions into Capillaries
… the processes by which penetration occurs. Dissipation in the wedge was investigated as a source of deviation from Lucas-Washburn behaviour. Three theoretical models were compared to the experimental data: (I) The Lucas-Washburn model, (II) A “Young” model and (III) Overflowing cylinder …
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Field and theoretical investigations of strain localization: Effects of mineralogy, shear heating and grain size evolution on deformation in the Earth
Viscous and viscoelastic deformation strongly affects the mechanical behavior of the Earth. This style of deformation has consequences for a wide range of geodynamic processes from large scale processes like the formation and maintenance of plate boundaries, to smaller scale processes like …
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Softmatter tribology: Understanding the microstructure to property relationships of hydrogel-like materials
… relating the dynamic and static frictional dissipation to the microstructure of these materials. Conversely, this fundamental gap in knowledge also limits progress in the design of functional replacements, based on hydrogel-like materials. Our aim was to not only advance the existing …
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Analysis of civil aircraft propulsors with boundary layer ingestion
… the power savings due to BLI (from reduction of viscous dissipation both in the aircraft wake and the propulsor jet) leads to scaling choices for the sizing of propulsor simulators for wind tunnel experiments to assess BLI benefit. Fan stage distortion response is assessed computationally for a …
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The stability of viscoelastic fluids in complex flows : the role of shear and extensional rheology
… with closed streamlines can accumulate heat from viscous dissipation resulting in spatial nonuniformities in the temperature profile and viscometric properties. In this thesis, a detailed study of the effect of viscous heating on the steady shearing of elastic fluids between a rotating …
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Laminar heat transfer to non-Newtonian fluids in pipes with abrupt changes in diameter
… A theoretical assessment of the influence of viscous dissipation on a non-Newtonian pseudoplastic fluid of' arbitrary index "n" was carried out. The effects of other secondary factors such as free convection and temperature-dependent consistency were evaluated empirically. In the present …
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Performance limits of axial turbomachine stages
… the losses which cannot be eliminated (such as viscous dissipation within the boundary layer on wetted surface area), (2) selecting stage design variables for minimum loss, and (3) assessing performance in the incompressible limit, an upper bound on stage efficiency can be determined as a …
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Mechanics of elastomeric copolymers
… are addressed in terms of their resilience and dissipation involving elastomeric "segmented" copolymers and elastomeric "ionic" copolymers. The presence of hard and soft domains yields to multiple molecular relaxations and hence multiple viscous dissipation mechanisms in elastomeric copolymers. …
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