- no frictional (viscous) force
- no loss of energy
Blood flows from the aorta at 100mmHg, around through arteries, cappillaries, veins, and up the right atrium of the heart, where its end pressure is 0. If the measured volume flow rate is 0.8 L/s what is the net flow resistance, in S.I. units?
What force F is required to keep the top plate moving at a constant speed(v)?
≡ coefficetn of viscosity
Units are [ Pa · s ]
Older unit is “poise”
1 Pa · s = 10 poise
It can be Shown
Our previous quations are only good for approximatly laminat flow. If
r = radius of pipe
= density of fluid
v = fluid of velocity
= fluid viscosity
< 3000 = unstable
3000 = turbulent
Experiments have shown that flow will be laminar if NR< 2000, and turbulent if NR < 3000. Between these two values, the flow is unstable, and may change from one type of flow to the other.
Blood flowing at 30cm/s through the aorta of a radius 1.0cm. Blood has a viscosity of 4mPars, and density 1060 kg/m^3 What type of flow