BME 409 EXAM 3 QUESTIONS AND
ANSWERS
Shear Stress and Atherosclerosis relationship - Answer-Correlation because of
statistics, but not cause-effect
Stokes flow, Low Reynold's number flow - Answer-Other names for creeping flow
Reynold's number <<1 - Answer-Creeping flow
Microorganisms - Answer-Creeping flow is often associated with...
Negligible - Answer-Creeping flow gravity assumption
approximately 1 - Answer-strouhal number for creeping flow, assume steady flow or if
there is some oscillation, Strouhal number is...
Density - Answer-Which parameter does not scale pressure?
Viscosity - Answer-Pressure scales with ... in creeping flow
Creeping flow - Answer-Drag force on a sphere is associated with which type of flow?
1. High Re # flow (inviscid regions)
2. Vorticity is negligibly small (irrotational) - Answer-2 flow situations where viscous
navier stokes can be neglected
High free stream velocity = thinner boundary layer - Answer-How does free stream
velocity relate to boundary layer thickness?
1 x 10^5 - Answer-critical Reynold's number for a smooth flat plate with uniform free
stream flow
3 x 10^6 - Answer-transition reynold's number for fully turbulent boundary layer
Displacement thickness - Answer-distance that streamline just outside boundary layer is
deflected away from wall due to effect of a boundary layer
Q(t) = Q0, 0<=t<=ts
Q(t) = 0, ts<t<=T
ts = time at end of systole
T = rest of cardiac cycle - Answer-Boundary conditions for Windkessel model
ANSWERS
Shear Stress and Atherosclerosis relationship - Answer-Correlation because of
statistics, but not cause-effect
Stokes flow, Low Reynold's number flow - Answer-Other names for creeping flow
Reynold's number <<1 - Answer-Creeping flow
Microorganisms - Answer-Creeping flow is often associated with...
Negligible - Answer-Creeping flow gravity assumption
approximately 1 - Answer-strouhal number for creeping flow, assume steady flow or if
there is some oscillation, Strouhal number is...
Density - Answer-Which parameter does not scale pressure?
Viscosity - Answer-Pressure scales with ... in creeping flow
Creeping flow - Answer-Drag force on a sphere is associated with which type of flow?
1. High Re # flow (inviscid regions)
2. Vorticity is negligibly small (irrotational) - Answer-2 flow situations where viscous
navier stokes can be neglected
High free stream velocity = thinner boundary layer - Answer-How does free stream
velocity relate to boundary layer thickness?
1 x 10^5 - Answer-critical Reynold's number for a smooth flat plate with uniform free
stream flow
3 x 10^6 - Answer-transition reynold's number for fully turbulent boundary layer
Displacement thickness - Answer-distance that streamline just outside boundary layer is
deflected away from wall due to effect of a boundary layer
Q(t) = Q0, 0<=t<=ts
Q(t) = 0, ts<t<=T
ts = time at end of systole
T = rest of cardiac cycle - Answer-Boundary conditions for Windkessel model
