Biomedical Engineering Reference
In-Depth Information
4.9
Review Questions
1. Describe the constituents of blood.
2. What is the haematocrit of blood?
3. Describe the main factors that influence the viscosity of blood.
4. What happens to blood viscosity as a blood vessel decreases in diameter?
5. Under what circumstances could blood be assumed to behave as a Newtonian
fluid?
6. How do the changes in blood viscosity and its hematocrit levels affect an ath-
lete's sports performance?
7. What is the primary cause for shear forces in blood flow?
8. How does the pressure force acting on blood differ from shear forces?
9. What does the Reynolds number describe in terms of blood flowing through an
artery vessel?
10. What factors would contribute to a laminar blood flow? What would cause the
flow to change to a turbulent flow?
11. What does a developing region refer to for internal pipe flows, and what is the
entrance length?
12. As the Reynolds number increases is the entrance length longer or shorter?
Explain why?
13. Describe the difference between a laminar, and a turbulent velocity profile.
14. What does Poiseuilles's Law describe? If a vessel's diameter is reduced by half,
how much of an influence does it have on the pressure?
15. What does Bernoulli's equation describe? How does the equation help describe
the flow through a constricted vessel such as a stenosis?
16. What are Dean vortices?
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