Flow characteristics in symmetrically branched tubes simulating the human aortic bifurcation

Area of Science:

• Biomedical Engineering
• Fluid Dynamics
• Cardiovascular Science

Background:

• The human aorta experiences complex blood flow patterns, particularly at bifurcations.
• Understanding flow characteristics is crucial for diagnosing and treating cardiovascular diseases.

Purpose of the Study:

• To investigate flow dynamics in a symmetrically branched tube simulating the human descending aorta.
• To analyze velocity profiles and shear rates under steady and pulsatile flow conditions.

Main Methods:

• Utilized a laser Doppler anemometer to measure velocity profiles.
• Simulated steady and pulsatile blood flow in a branched tube model.
• Employed specific area ratio (0.8) and branching angle (70 degrees) for aortic relevance.

Main Results:

• Observed transient flow reversal along the outer wall during the minimal flow phase of the pulsatile cycle.
• Confirmed that flow separation did not occur under the tested conditions.
• Determined higher shear rates on the inner wall and lower shear rates on the outer wall at the bifurcation vertex for both flow types.

Conclusions:

• The study provides insights into the hemodynamics of aortic bifurcations.
• Flow patterns, including transient reversal and wall shear stress distribution, are critical factors in vascular health.
• Findings contribute to a better understanding of blood flow mechanics in the aorta.