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 16 of 16 for “"droplet impingement"”.
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Spray and Single Droplet Impingement on a Wall
… the major characteristics of spray and single droplet impingement are modeled. First a stochastic model based on the sampling of velocity and size distributions of secondary droplets is used to simulate impingement breakup. The numerical predictions are compared to experimental results yielding …
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Modeling Droplet Impingement Dynamics on Micropillar-Arrayed Viscoelastic Substrates Through Microgeometry-Free and Multiscale Methods
The droplet impact dynamics on micropillar-arrayed viscoelastic substrates has been thoroughly investigated by two distinct modeling methods, i.e., microgeometry-free and multiscale modeling methods. The viscoelasticity of the micropillar-arrayed substrate is characterized by a five-parameter …
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Hybrid Airfoil Design Methods for Full-Scale Ice Accretion Simulation
… could be designed to simulate full-scale airfoil droplet-impingement characteristics and, therefore, ice accretion. The study showed that the primary objective in such a design should be to determine the aft section profile that provides the circulation necessary for simulating full-scale airfoil …
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Liquid Atomization by an Electrostatic Rotating Bell Atomizer and Spray Deposition on Solid Surfaces
… After the fluid is ejected, it breaks up into droplets. Images of these spray droplets were captured using a DropSizer while operating the bell-cup at various angular frequencies (ω). After processing the images to obtain the droplet sizes, the Sauter mean diameter (SMD) was found to decrease …
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An Eulerian 3D analysis of water droplets impingement on a Convair-580 nose and cockpit geometry
… of the first 3-D application of an Eulerian droplet impingement code. The code, DROP3D, was developed at the CFD Laboratory at Concordia University by Professor Yves Bourgault. DROP3D is part of an integrated in-flight icing package, FENSAP-ICE, under constant development at the CFD …
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Analysis of droplet behavior on a rotating surface in atomization-based cutting fluid systems for micro-machining
… for varying cutting fluids and at different droplet speeds. Micro-turning experiments indicate that a cutting fluid with low surface tension and low viscosity generates lower cutting temperatures whereas a fluid with low surface tension and high viscosity generates lower cutting forces. Since …
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Lattice Boltzmann simulations of multiphase flows
… a number of fundamental flow problems including droplet impingement on solid and liquid surfaces as well as multiphase flow in complex micro-channels. In addition, we examine in great detail the problem of axial droplet migration and deformation in a square-duct at moderate Reynolds number. Our …
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Use of hybrid airfoil design in icing wind tunnel tests of large scale swept wings
… effects due to the wind tunnel walls, but the droplet impingement remained similar, implying that the hybrid design is not highly dependent on tunnel walls for wind tunnel height to airfoil chord (h/c) ratios greater than two.
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Electric field based fabrication methods for multi-scale structured surfaces
… critical to understand how moving liquid water droplets will behave when they encounter these modified surfaces. We investigate drop impingement on porous thin films produced by BDA and EPD in order to understand the effects of surface structure and chemical properties on droplet dynamics. Using …
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Understanding the Formation Mechanism of Plasma-sprayed Ni and Ni20Cr Splats through Experimental and Numerical Study
… coatings, the molten (or semi-molten) droplets impact on the substrate surface, spread and solidify to form splats with various morphologies. Splats serve as the basic building blocks of the bulk coating where their morphology changes and splat-substrate interactions are critical for …
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Droplet behavior on superhydrophobic surfaces: Interfaces, interactions, and transport
… objective of the present work is to study droplet dynamics on smooth hydrophobic and textured superhydrophobic surfaces, and to understand the dependence of interfacial interaction mechanisms on surface morphology. ^ A detailed understanding of the dynamics of droplet response to an applied …
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Fabrication and robustness testing of superhydrophobic nanostructured surfaces for enhanced jumping condensation
… nano-structured surfaces which promote a jumping droplet mode of condensation have been shown to enhance heat transfer over conventional film wise condensation surfaces, but limited robustness testing has been reported validating feasibility of industrial implementation. This thesis seeks to …
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Evaluation of the atomization-based cutting fluid spray system in milling of titanium alloy
… are different from turning, like milling. The droplet impingement dynamics in milling are different than that in turning because of the presence of a rotating cutting tool as opposed to a stationary single point cutting tool in turning. Also, milling is an intermittent cutting process that gets …
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A study on the fluid film of an atomization-based cutting fluid (ACF) spray system during titanium machining
… ACF spray experiments are performed by varying impingement angle in order to observe the nature of the spreading film and to determine the film thickness at different locations after impingement of the droplets. It is observed that the film spreads radially outward producing three fluid film …
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Development and application of Lattice Boltzmann and accurate volume of fluid numerical techniques on graphics processing units
… applied them to study various flows including droplet impingement on solid and liquid surfaces, head-on and oblique droplet collisions, droplet deformation in a square duct, and displacement flow in complex micro-channels. Both SC and HC methods were able to model liquid-liquid flow, whose …
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Large-scale swept-wing ice accretion modeling in the NASA Glenn Icing Research Tunnel using LEWICE3D
… of the research. LEWICE3D was used to simulate droplet impingement and ice accretion on the swept model in the IRT test section. Attachment line location is shown to be the primary driver of icing similarity. It is shown that on the flapped-hybrid model, the attachment line can be uniformly …