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Oxygen mass transfer calculations in large arteries
1Department of Mechanical Engineering, University of Toronto, Ontario, Canada.
Journal of Biomechanical Engineering
|January 4, 1998
Summary
Oxygen transport in arteries is mainly driven by wall tissue consumption and resistance, not blood flow. Accurate modeling requires coupling blood and wall transport, considering hemoglobin
Area of Science:
- Biomedical Engineering
- Physiology
- Computational Fluid Dynamics
Background:
- Oxygen transport in large arteries is crucial for tissue viability.
- Hemoglobin's role in oxygen carriage and wall tissue metabolism are key factors.
- Stenosis can alter local oxygen dynamics.
Purpose of the Study:
- To model oxygen transport in stenosed large arteries.
- To investigate the influence of hemoglobin, blood-wall coupling, and wall metabolism.
- To evaluate computational simplifications for oxygen transport modeling.
Main Methods:
- Numerical simulations of oxygen transport in an axisymmetric stenosis model.
- Analysis of various boundary conditions, linearization schemes, and Schmidt numbers.
- Comparison against a full nonlinear governing equations solution.
Main Results:
- Wall-side effects (consumption, mass transfer resistance) dominate oxygen transport.
- Hemodynamic factors have a minor impact on intimal oxygen tension.
- Linearized models are accurate for blood-side transport within physiologic ranges.
- Neglecting hemoglobin binding causes significant errors.
Conclusions:
- Oxygen transport modeling in arteries must integrate blood and wall compartments.
- Accurate representation of wall oxygen consumption is essential.
- Hemoglobin's role is critical and cannot be ignored in modeling.