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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v3.i2-3.80
pages 207-223

STUDY OF PULSATILE FLOWS IN LATERAL ANEURYSM MODELS ON A STRAIGHT PARENT VESSEL USING PARTICLE TRACKING VELOCIMETRY

Tong-Miin Liou
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 407, ROC
Chin-Chun Liao
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30043, Republic of China

ABSTRACT

Particle tracking velocimetry (PTV) measurements are presented of transient flow fields in the lateral aneurysm model arising from a straight parent vessel at a 90° angle. The flow considered was pulsatile with a Womersley number of 3.9 and the aneurysm was rigid. The Reynolds number based on the bulk average velocity and diameter of the parent vessel was 600. Four consecutive flow-rate phases were selected to characterize the pulsatile flow fields in the aneurysm sac. It is found that there exist two opposite vortices in the upper half and lower half of the aneurysm sac. The fluids near the dome region, when compared with the main stream in the parent vessel, undergo a phase lag leading to the distribution of wall shear stress along the dome wall at the minimal phase that is larger than that at the other investigated phases. Variations of the velocity distribution, vorticity, and wall shear stress through four consecutive phases are also discussed.