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FLOW HEMODYNAMICS WITHIN A BENT ASYMMETRIC STENOSED ARTERY
Department of Mechanical Engineering, Indian Institute of Technology Kanpur,
Abdullah Y. Usmani
Department of Mechanical Engineering, ZH College of Engineering and Technology, AMU, Aligarh
Plaque deposition on the arterial wall narrows down the arterial lumen, thus restricting blood flow and altering hemodynamics around the constriction. The bends in the arteries are believed to be potential sites of such deposits. In the present study, pulsatile flow in asymmetrically stenosed arterial models has been simulated numerically. The straight stenosed model is considered and is compared with 20°, 40°, and 60° bend stenosed models. Physiologically relevant inlet pulsatile waveform of Repeak = 300-800 and Wo = 7.62-15.24 is considered. Limited particle image velocimetry (PIV) experiments have also been performed for a 60° bend stenosed artery model to validate numerical results. In comparison to the straight stenosed tube an arterial bend (on the medial plane) reveals larger vortex patterns, diminishes the size of the secondary vortex on the outer wall, disturbed flow patterns in the post-stenotic region, and increased vortex strength (d2 values). Cross plane shows a large vortex strength during the late diastolic portion of the cycle, being indicative of strong three-dimensionality within the flow. With an increased bend angle (θ = 20-60°), these trends intensify in conjunction with higher wall shear stress (WSS) values being experienced at the throat and oscillatory wall loading (OSI ~ 0.5) prevailing along the post-stenotic portion. Time-averaged WSS reveals a large recirculation zone, which in turn indicates that a 60° stenosed bend is the most critical from the biomedical point of view.
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