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 27 for “"Thermocapillary"”.
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Investigation of Thermocapillary Flows Around Hemispherical Bubbles
Transient thermocapillary induced flows around a hemispherical bubble on a heated wall have been studied using numerical solutions for a wide range of Marangoni numbers (up to 10('6)). Natural convection effects and mass transfer at the bubble interface were included. Two distinct boundary …
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Thermocapillary Convection During Laser Surface Heating (Surface Tension)
… consideration. Mathematical models for the thermocapillary convection within the molten pool are thus formulated. The models are solved numerically. A transient two-dimensional model, which gives a qualitative understanding of the flow field and the heat transfer in the spanwise direction, …
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Thermocapillary convection in laser melted pools during materials processing
… is induced by buoyancy and surface tension (thermocapillary) forces. This motion of the liquid metal causes heat to be redistributed (convective heat transfer) which in turn effects the melt pool shape (solid/liquid interace), local temperature gradients, and ultimately, the microstructure of …
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Buoyancy-thermocapillary convection of volatile fluids in confined and sealed geometries
… with a free surface due to a combination of thermocapillary stresses and buoyancy is a classic problem of fluid mechanics. It has attracted increasing attentions recently due to its relevance for two-phase cooling. Many of the modern thermal management technologies exploit the large latent …
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Numerical Simulation And Control Of Thermocapillary Convection In Cavities And Liquid Layers
The problem of steady thermocapillary convection in cavities and liquid layers in the absence of gravity is studied. The flow is driven by a temperature gradient parallel to the interface.;An effective algorithm for analysis of the above problem has been developed. The algorithm is based on a …
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Thermoelectric Magnetohydrodynamic and Thermocapillary Driven Flows of Liquid Conductors in Magnetic Fields
Experiments show that TEMHD dominates the flow in SLiDE, consistent with the theory governing these flows. This is verified by series of qualitative experiments, as well as quantitative comparison with theoretical flow predictions. This constitutes the first direct observation of TEMHD driven flow …
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Magnetic Damping of Thermocapillary Convection in the Floating-Zone Growth of Semiconductor Crystals
… conducted in the area of the magnetic damping of thermocapillary convection in floating zones. Both steady and unsteady flows have been investigated. Due to the added complexities in solving Maxwells equations in these magnetohydrodynamic problems and due to the thin boundary layers in these …
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Optimization of purely semiconducting carbon nanotube complementary field effect transistors
… removal process with joule heating induced thermocapillary flow in thin organic layers. Detailed experimental studies reveal the selective removal of metallic SWNTs. We provide statistically significant demonstrations to prove the effectiveness and selectivity of this approach and to study …
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Advanced purification of aligned arrays of single-walled carbon nanotubes
… strategies to address this issue. Nanoscale thermocapillary flows and subsequent etching serve as an effective way to remove the metallic impurities in perfectly aligned arrays of SWNTs grown on quartz substrates. We develop a nanoscale thermometry-scanning Joule expansion microscopy (SJEM) …
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Piezoelectric flexing and output voltage of a microchannel heat engine
… model includes friction, pressure, viscous and thermocapillary forces on the droplet. This thesis examines the concept of a piezoelectric device at one end of the channel to generate electricity from thermocapillary pumping of the droplet within the microchannel. The slug flow model is used to …
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Multi-Scale Model of the Stability of a Laterally Heated Liquid Bridge Under the Influence of an Axial Magnetic Field
Thermocapillary flows, occurring in floating-zone semiconductor crystal growth, are studied using numerical and analytical linear stability analyses. In this process, a polycrystalline feed rod is passed through an optical heating source, where it melts and then re-solidifies into a single crystal. …
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Modeling and Scaling Electrostatic Effects in Dilute Solid-Gas Suspensions
An experimental and theoretical investigation of thermocapillary convection in liquid drops is presented. The experiments were conducted on a pendant drop (approximately 1 mm in height) suspended from a thermocouple junction and heated from above. A theoretical model was developed to assist in the …
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Approaches for alignment and purification of single walled carbon nanotube thin films and their application in device electronics
… arrays based on selective, joule heating induced thermocapillary flow in thin organic layers deposited on the array that is localized to the metallic SWNTs and subsequent etching to yield their removal. We provide statistically significant demonstrations to prove the effectiveness and selectivity …
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Laser weld pool optical diagnostics: Topography and visualization used for surface contour analysis and process monitoring
… the surface contour: density change, porosity, thermocapillary flow, radiation pressure, cover gas flow, recoil pressure, and mass loss. Analysis shows the volume change associated with density change, the volume change associated with mass loss, and recoil pressure are the most important …
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A moving mesh method for non-isothermal multiphase flows
… examples: natural convection in a cavity, thermocapillary convection of two layers, and droplet migration subject to a temperature gradient. Our method is then applied to investigate the liquid bridge breakup with thermocapillary effect. The non-isothermal liquid bridge breakup in the …
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Fluid transport and entropy production in electrochemical and microchannel droplet flows
… produced by industrial or other sources. The thermocapillary motion of fluid droplet in a closed rectangular microchannel is used to generate electrical energy from waste heat in a piezoelectric membrane by inducing mechanical deformation as a result of the droplet motion. Modeling, …
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Computer aided floating zone growth of Germanium-Silicon crystals in a resistance heated multi-zone furnace
… explained. The instability mechanism <br>of thermocapillary convection in a low Pr floating zone could be <br>attributed to the interaction of buoyancy convection and surface <br>flows. The direct numerical simulations were based on a full zone <br>model.
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Mechanisms of focused ion beam (FIB) material removal and rearrangement at high beam flux
… under these extreme conditions suggest that thermocapillary effects are important. A flow model with a Marangoni forcing term, based upon the temperature gradient from the atomistic simulation, confirms the presence of thermocapillary effect by reproducing the flow.
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Direct computations of marangoni driven flows using a volume of fluid method
… geometries, and for a classical problem of the thermocapillary migration of bubbles. The study of several applications of variable surface tension flows is presented, such as the breakup of liquid metal films and filaments, and the coalescence of drops characterized by different surface tension.
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Interfacial Dynamics and Applications in Optofluidics
… induced by the radiation pressure, thermocapillary effect, light scattering and Kerr effect are compared. We show that the radiation pressure due to the WGM produces the strongest nonlinear optofluidic effect.
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