Inscrição na biblioteca: Guest
TSFP DL Home Arquivos Comitê executivo

TURBULENT FLOW CHARACTERISTICS IN A STENOSED ARTERIAL MODEL WITH RELEVANCE TO ATHEROSCLEROSIS

Sean D. Peterson
School of Mechanical Engineering Maurice J. Zucrow Laboratories, Purdue University West Lafayette, Indiana 47907 USA; Department of Mechanical and Mechatronics Engineering University of Waterloo 200 University Avenue West, Waterloo, Ontario, Canada

Michael W. Plesniak
Maurice J. Zucrow Laboratories (formerly Thermal Sciences and Propulsion Center), School of Mechanical Engineering, Purdue University, West Lafayette, Indiana, USA; Department of Mechanical and Aerospace Engineering The George Washington University

Resumo

The flow field downstream of a nominally concentric 75% axisymmetric area reduction in a tube subjected to a sinusoidal pulsatile waveform is presented herein. The flow field is measured using phase-locked Particle Image Velocimetry at six phase angles. Steady vortical structures are observed in the shear layer from approximately 1.5 tube diameters to 3.7 tube diameters downstream of the stenosis throat. These stationary vortices induce a spatially varying core flow velocity. Additionally, the stenosis creates an annular vortex upstream of the occlusion near the velocity minimum of the pulsatile waveform. These regions of disturbed flow are known to be atherogenic, particularly when the wall shear stress is very low and/or oscillatory.