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 48 for “"droplet evaporation"”.
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Mathematical modelling of droplet evaporation
… theoretical modelling and analysis of sessile droplets of liquids as they evaporate in different modes of evaporation. The thesis focuses on diffusion limited evaporation in which the diffusion of vapour in the surrounding atmosphere governs the evaporation rate of the droplet.;First, we …
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Droplet evaporation dynamics on surfaces
Droplet evaporation governs many man-made and natural processes. Hence, it has been widely studied by many scientists over the past century. With the recent advancements in nanotechnology, many surfaces for two phase heat transfer have been developed including hydrophobic, biphilic and …
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Influence of forced convection on sessile droplet evaporation
Evaporation is a phase change process with potential for achieving large heat transfer rates under high air temperatures due to the latent heat of vaporization. Bioin-spired artificial perspiration systems can leverage the evaporation of sessile droplets to implement this effect for different …
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A Molecular Dynamics Study of Sessile Droplet Evaporation
… dynamics simulations to investigate the evaporation process of nanosized droplets adsorbed on a substrate. Beads interacting with each other via Lennard-Jones (LJ) potentials are used to construct the simulation systems. The solid substrate contains 6 layers of beads forming a …
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The Effects of Surface Topography on Droplet Evaporation and Condensation
Droplet evaporation and condensation are two important topics of interest, since these two phase-change phenomena not only occur in the cycle of global water, e.g., the formation of rain, fog, dew, and snow in nature, but also play a critical role in a variety of applications including phase-change …
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The separation of two different sized particles via droplet evaporation
An evaporating droplet with different sized particles was examined both computationally and experimentally. During evaporation, particles can naturally separate into concentric rings by size with one ring per particle size. The objective of this investigation was to determine factors that …
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A droplet evaporation model for high temperature and pressure spray applications
A zero-dimensional single droplet evaporation model, suitable for the high temperatures and high pressures encountered in diesel engines, has been developed, based on an extensive review of previous work on droplet evaporation. The new model includes the dependence of gas and liquid thermodynamic …
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Modeling of droplet evaporation, flash-boiling, and mixture preparation in internal combustion engines
… In this study, a modular multi-component droplet evaporation model is developed based on the existing model by the author’s lab. The updated model is capable of estimating the thermal and transport properties of real mixture of known compositions. Also added is a vapor-liquid equilibrium …
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A theoretical investigation of liquid droplet evaporation in a high velocity gas stream
Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1951
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Analysis and feasibility of an evaporative cooling system with sessile droplet evaporation to provide cooling for microprocessors
… Core i7-900 Processor using diffusion based evaporation of sessile droplets. An analytical model is developed to determine the capacity of a single layer of droplets to provide sufficient cooling. It is found that a single layer can provide sufficient cooling for the processors with tiny …
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Numerical investigation of the combustion of liquid oxygen droplets in an environment of hydrogen under microgravity conditions
… the configuration of a single liquid oxygen droplet surrounded by gaseous hydrogen diluted with helium. A numerical model using OpenFOAM as well as a coupled droplet evaporation model based on combining OpenFOAM results with the existing theoretical models have been developed to understand …
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Aerosol transport by coughing in a depressurized and air-conditioned chamber
Expiratory droplets from human coughing in an air-conditioned environment have always been considered to be potential carriers of pathogens, responsible for respiratory disease transmission. The air movement/circulation and ambient conditions such as pressure and temperature are all key factors of …
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An investigation of transcritical effects for fuel injection and mixing applications
… for characterizing transcritical effects on droplet evaporation at ambient conditions typical of modern combustors. The approach combines scaling analysis with a first-principles model to describe droplet evaporation behavior in fluid-independent, non-dimensional terms. The developed model is …
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Effects of trans / supercritical behavior of carbon dioxide on power and propulsion applications
… framework was developed to assess the impact of droplet evaporation time on the combustion dynamics under sub-, trans- and supercritical conditions. This framework combines an analytical one-dimensional acoustic solver with a previously developed droplet evaporation model and a heat release …
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Enhanced Heat Transfer Performance by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar
… by Shape Optimization of a Non-axisymmetric Droplet Evaporating on a Heated Micropillar</p> <p>By</p> <p>Haotian Wu</p> <p>Department of Mechanical Engineering and Materials Science</p> <p>Washington University in St. Louis, 2019</p> <p>Research Advisor: Professor Damena Agonafer</p> <p>The …
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Droplet-based Two-phase Thermal Management
… new advanced thermal management methods. Droplet-based two-phase thermal management technologies are considered promising solutions to conquer the cooling challenges in the electronic industries. The heat transfer behavior of droplets is based on several important fundamental processes, …
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Raman and Surface-Enhanced Raman Spectroscopy Imaging of Droplets: Characterization and Environmental Implications
Droplets are ubiquitous microscopic systems - ranging in size from several nanometers to ~100 micrometers – that undergo abundant environmental interactions. Researchers have shown that droplets can impact both earth climate and air quality through physical and chemical processes. Droplets released …
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Surface Coatings for Antimicrobial Activity and Fast Evaporation
… in two areas: antimicrobial activity and fast evaporation. The COVID-19 pandemic underscored the necessity for coatings that mitigate microbial transmission through surfaces, alleviating both contagion and personal fears. The first part of this study presents the design, development, and …
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Molecular and active interfaces : controlling the adhesion of low surface tension fluids and solid microparticles
… deposition patterns during colloidal droplet evaporation. Acoustic waves are utilized to enhance the condensation of ultra-low surface tension liquids, and electric fields are used to suppress the coffee-ring effect and ultimately control the uniformity of microparticle deposition …
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Numerical Modelling of LOX Droplet Combustion in Hydrogen under Micro-gravity Conditions
… cooling in the rocket nozzle. When the LOX droplets ignite, combustion happens between them and the surrounding hydrogen fuel environment. The essential building block of this process is considered for this study, which is a single LOX droplet with a surrounding hydrogen environment, in …
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