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An LDA and flow visualization study of pulsatile flow in an aortic bifurcation model
T Naiki1, K Hayashi, S Takemura
1Research Institute for Electronic Science, Hokkaido University, Sapporo, Japan.
Biorheology
|January 1, 1995
Summary
Pulsatile flow in a human aortic bifurcation model shows flow separation and disturbed near-wall velocities. These abnormal flow patterns may contribute to the development of atherosclerosis.
Area of Science:
- Fluid dynamics
- Biomedical engineering
- Cardiovascular research
Background:
- The human aorta experiences pulsatile blood flow, with bifurcations presenting complex flow dynamics.
- Understanding flow patterns at the aortic bifurcation is crucial for studying cardiovascular diseases like atherosclerosis.
Purpose of the Study:
- To investigate the detailed structure of pulsatile flow within a rigid model of a human aortic bifurcation.
- To analyze near-wall velocity patterns and their potential link to atherogenesis.
Main Methods:
- Utilized flow visualization techniques and three-dimensional laser-Doppler anemometry.
- Employed a glass model replicating average human aortic bifurcation geometry.
- Integrated the model into a mock circulatory loop generating physiological pulsatile flow.
Main Results:
- Observed flow separation during accelerated and decelerated flow phases.
- Identified double helical flow within separation zones during early acceleration.
- Noted disturbed flow post-separation and significant near-wall velocity alterations, including abnormal phasic changes.
Conclusions:
- Flow separation and associated disturbances significantly impact near-wall velocities at the aortic bifurcation.
- Abnormal near-wall velocity patterns observed in the study may be implicated in the initiation of atherosclerosis.
- 3D velocity measurements are valuable for detailed analysis of near-wall flow dynamics.