Blood as a Fluid 2

Question 1

What is mass flow rate?

Answer 1

Mass of fluid that passes per unit of time (density * area *velocity)

Question 2

What is volume flow rate?

Answer 2

Volume of fluid that passes per unit of time (area * velocity)

Question 3

What is the equation of continuity?

Answer 3

Flow rate must stay the same when velocity or area changes
for mass flow: density * A1 *v1 = density * A2 * v2
for volume flow: A1 * v1 = A2 * v2

Question 4

What is fluid viscosity?

Answer 4

The resistance between adjacent layers of fluid as they pass each other
Characterised by coefficient of viscosity (η)

Question 5

What is laminar flow?

Answer 5

Laminar flow is when adjacent layers of fluid move past one another

Question 6

What is turbulent flow?

Answer 6

Turbulent flow is a flow type which occurs when fluids are moving at high speeds with low viscosities, and causes the fluid layers to mix

Question 7

What is Reynolds Number and how do you calculate it?

Answer 7

Reynolds Number is a constant which can determine which type of flow a fluid is undergoing. (low number -> laminar, high number -> turbulent)
Re = (density * velocity * length)/η

Question 8

What is Bernoulli’s Principle?

Answer 8

As speed of a fluid increases, its pressure decreases due to conservation of energy (for constant height)

Question 9

How can blood flow through arteries be modelled

Answer 9

Poiseulle’s Equation
Q = (delta P * pi * r^4)/(8 * η * L)