Publisher : The Korean Society of Mechanical Engineers
DOI : 10.3795/KSME-B.2016.40.8.511
Title & Authors
PIV Measurement of Pulsatile Flows in 3D Curved Tubes Using Refractive Index Matching Method Hong, Hyeon Ji; Ji, Ho Seong; Kim, Kyung Chun;
Three-dimensional models of stenosis blood vessels were prepared using a 3D printer. The models included a straight pipe with axisymmetric stenosis and a pipe that was bent from the center of stenosis. A refractive index matching method was utilized to measure accurate velocity fields inside the 3D tubes. Three different pulsatile flows were generated and controlled by changing the rotational speed frequency of the peristaltic pump. Unsteady velocity fields were measured by a time-resolved particle image velocimetry method. Periodic shedding of vortices occurred and moves depended on the maximum velocity region. The sizes and the positions of the vortices and symmetry are influenced by mean Reynolds number and tube geometry. In the case of the bent pipe, a recirculation zone observed at the post-stenosis could explain the possibility of blood clot formation and blood clot adhesion in view of hemodynamics.
Pulsatile Flow;PIV Measurement;Refractive Index Matching;Vortex Motion;Stenosis Model;
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