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Development And Validation Of A Computational Model For Studying Secondary Droplet Breakup In Time-Varying Flows, Brandan A. West
Development And Validation Of A Computational Model For Studying Secondary Droplet Breakup In Time-Varying Flows, Brandan A. West
Honors Theses
Secondary droplet breakup is an important topic in fluid mechanics that has applications in many atomization processes. To date, the experimental and computational research of secondary droplet breakup has focused primarily on the breakup process in flows that have steady velocities. This study utilizes computational fluid dynamics software called Star-CCM+ Version 7.04.006 to study the effects of time-varying flows on the droplet breakup process. Time-varying flows are more representative than steady flows are of the flow situations in combustion chambers of high-level engines such as jet and rocket engines. Weber number is the ratio of the external flow’s inertial forces …
Secondary Droplet Breakup In Periodic Aerodynamic Flows Using Computational Fluid Dynamics, Krystle Gallo
Secondary Droplet Breakup In Periodic Aerodynamic Flows Using Computational Fluid Dynamics, Krystle Gallo
Honors Theses
Combustion instability is characterized by periodic fluctuations during the combustion process. Such instabilities can cause a reduction in engine performance and damage to engine components. In liquid fueled combustion, some types of combustion instability may be driven by changes in fuel droplet size distribution. The fuel droplet size distribution can be changed if the original or “primary” fuel droplets are broken apart by the flow. This is called secondary droplet breakup. The smaller drops that are created during breakup are consumed more rapidly and increase the energy release rate, which may act as a sustaining force of the instability. Currently, …
Micro-Piv Of Self-Propelling Bi-Slugs In A Micro Channel, Lilla M. Safford Smith
Micro-Piv Of Self-Propelling Bi-Slugs In A Micro Channel, Lilla M. Safford Smith
Honors Theses
Bi-slugs are fluid entities involving two dissimilar fluids that move “on their own” due to differences in surface tension. At the micro-fluidic scale this sort of motion may be useful to efficiently transport small quantities of fluid from place to place. This study uses Micro-Particle Image Velocimetry (µ-PIV) techniques to investigate self propelling bi-slug flows. The bi-slugs examined are made of ethylene glycol and Xiameter PMX-200 Silicone Fluid (5cst and 10cst) and placed in a glass micro-channel of approximately 1mm diameter. The Reynolds number (Re) range considered (based on ethylene glycol in the slug) is 2.54 - 1.07 and the …