Pressure and Velocity Fluctuations Associated with the Flow Through a Stenosis with Upstream Roughness

The nature of steady flow of a blood-analog fluid distal to a stenosis was demonstrated in a model artery. The relationship was explored between such flow and the generation of velocity and pressure fluctuations that might lead to the production of sound in an artificially roughened, rigid tube. Attention was directed solely to the generation of pressure fluctuations within the fluid itself. No regard was paid to the possibility of structural vibration or resonance as a response to fluctuations generated in the fluid other than to eliminate the possibility for such effects in the model and test stand.