Flashcards in Bruce's Fluid Dynamics Final Prep Deck (52)
honey is "thick", having a
the less viscous the ﬂuid is, the . . . .
greater its ease of movement (ﬂuidity).
State the units of viscosity
Viscosity centipoise (cP)
Sheer stress is directly proportional to . . .
Sheer stress is inversely proportional to . . ..
the distance from the wall
Newtonian ﬂuids have
a constant viscosity
Thixotropic ﬂuids become
less viscus as the sheer force increases
property of certain gels or ﬂuids that are thick (viscous) under normal conditions, but ﬂow (become thin, less viscous) over time when shaken, agitated, or otherwise stressed.
A thixotropic ﬂuid displays a decrease in viscosity
over time at a constant shear rate.
A shear thinning ﬂuid displays decreasing viscosity with
increasing shear rate.
causes an increase in viscosity or even solidiﬁcation when exposed to constant shear stress for a period of time.
This property is called = rheopectic
Blood is often referred to as Non-Newtonian but the most appropriate term would be ?
Smaller capillaires have greater sheer forces, what happens to the blood?
becomes less viscous
Roller pumps have what 3 qualities ?
-predictable flow output
1/4" tubing =
3/8" tubing =
1/2" tubing =
Centrifugal pumps =
Preload and afterload dependent
The Afterload of the centrifugal pump is determined by
everything down stream from it in the circuit:
-size / length of the arterial line
During Vacuum Assisted Venous Drainage (VAVD) the preload is determined by
the amount of suction in the venous reservoir
greater negative pressures reducing preload to the pump and thereby
reducing blood ﬂow.