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Developing Dns Tools To Study Channel Flow Over Realistic Plaque Morphology, Ryan M. Beaumont
Developing Dns Tools To Study Channel Flow Over Realistic Plaque Morphology, Ryan M. Beaumont
Electronic Theses and Dissertations
In a normal coronary artery, the flow is laminar and the velocity is parabolic in nature. Over time, plaques deposit along the artery wall, narrowing the artery and creating an obstruction, a stenosis. As the stenosis grows, the characteristics of the flow change and transition occurs, resulting in turbulent flow distal to the stenosis. To date, direct numerical simulation (DNS) of turbulent flow has been performed in a number of studies to understand how stenosis modifies flow dynamics. However, the effect of the actual shape and size of the obstruction has been disregarded in these DNS studies. An ideal approach …
Viscoelastic Roll Coating Flows, Mitchell A. Johnson
Viscoelastic Roll Coating Flows, Mitchell A. Johnson
Electronic Theses and Dissertations
The physics of a fluid flow between two rotating cylinders is important in processes such as bearing lubrication, roll coating, and printing. A small amount of dissolved polymer in the fluid can have a large impact on the behavior of the process. Viscoelasticity affects the stability of application and metering processes, and reduces the maximum speed at which a uniform film can be coated onto a substrate. The goal of this work is to characterize the effect of viscoelasticity on the forward roll coating operation. A bench-top apparatus simulated the process. Measurements of the gap between the roll surfaces, pressure …