Flashcards in Lesson 20 (Part 1) Deck (29)

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1

## What are 2 types of flow?

###
1. Laminar

2. Turbulent

- non laminar

2

## What are 3 types of laminar flow?

###
1. Plug flow

2. Parabolic

3. Disturbed flow

3

## Where is plug flow?

### At the entrance to tubes

4

## How does blood move in plug flow?

### As a unit

5

## What is the speed in plug flow?

### The same speed across the vessel

6

## Where is parabolic flow?

### After entering the straight tube

7

## What is an example of parabolic flow?

### Common carotid artery

8

## Where is the speed the fastest in parabolic flow?

### In the center of the tube

9

## Where is the speed the slowest in parabolic flow?

### At the tube walls

10

## What is the average flow speed in the parabolic flow?

### 1/2 the fastest speed

11

## Laminar

### Layers

12

## When do you get disturbed flow? (2)

###
1. At a stenosis

2. At bifurcation

13

## What is disturbed flow still considered?

###
Laminar flow, but the streamlines are not straight

- non-parabolic

14

## When does turbulent flow occur?

### Usually after a significant stenosis

15

## Turbulent flow

###
Chaotic, multidirectional, multispeed flow

- non-laminar

16

## What does turbulent flow have?

### Eddies

17

## Eddies

### Flowing circles

18

## What is the overall flow in turbulent?

### Forwards

19

## What kind of noise could you hear with turbulent flow?

###
Bruit

- main reason to get an ultrasound

20

## What does turbulent flow depend on?

### Reynolds number

21

## What is the critical reynolds number for blood?

### 2000

22

## What can be produce with critical reynolds?

###
Turbulent flow

- flow must surpass a critical Reynolds number to cause turbulent flow

23

## What is the formula for Reynolds number?

###
Re = pvd/n

Re = renolds number

p = density of fluid

v = velocity of fluid

d - diameter of pipe

n = viscosity

24

## What happens to Re if velocity goes up?

### It increases

25

## What happens to Re if the diameter of the vessel increases?

### It increases

26

## What happens to Re if viscosity goes up?

### It decreases

27

## Re

### Reynolds number = turbulence

28

## Stenosis

### Partial blockage

29