Fundamental Principles of Fluid Properties (Lesson 1a)

Question 1

What happens to the flow rate when the pressure difference is higher/greater?

Answer 1

The flow rate increases (also greater)

Question 2

What is the equation for volumetric flow rate?

Answer 2

Q (mL) = pressure difference (dyne/cm^2)
____________
resistance to flow (poise)

Question 3

What happens if flow resistance increases?

Answer 3

Volumetric flow rate decreases

Question 4

What happens if pressure difference increases?

Answer 4

Volumetric flow rate increases

Question 5

What is poise?

Answer 5

Viscosity

Question 6

If a tube length increases, what happens to flow resistnace?

Answer 6

Increases

Question 7

If a tube raidus increases, what happens to flow resistance?

Answer 7

Decreases

Question 8

If viscosity increases, waht happens to flow resistance?

Answer 8

Increases

Question 9

What is plug flow?

Answer 9

A form of laminar flow, speed of fluid is essentially constant across the tube, occurs at the entrance to a tube or a vessel

Question 10

What is laminar flow?

Answer 10

Streamlines are straight and parallel to each other, flow speed is max at the center of the tube and minimum or zero at the tube walls

Question 11

What is parabolic flow?

Answer 11

A form of laminar flow, and the average flow speed across the vessel is equal to one half the maximum flow speed

Question 12

Where does disturbed flow commonly occur?

Answer 12

At region of stenosis or bifurcation

Question 13

What is turbulent flow?

Answer 13

Nonlaminar flow with random and chaotic speeds and directions; lanes no longer organized but a forward net flow is still maintained

Question 14

What is the continuity rule?

Answer 14

As diameter of the stenosis increases, flow speed increases to maintain flow (pressure drops)

Question 15

What is the equation for the continuity rule?

Answer 15

Q (Flow) = V (mean velocity) x area (cross sectional area of vessel)