Chemistry 2 Diffusiom Osmosis

Question 1

Factors that effect flow rate (6)

Answer 1

Flow rate=volume of liquid passing set point
pressure drop in a flowing liquid
viscosity of liquid
length of vessel
diameter of vessel
type of flow
walls of vessel

Question 2

Pressure in flowing liquids

Answer 2

Aliquidwillflowbetweentwo regionsifapressuredifference existsbetweenthetworegions
high –low

Question 3

How does viscosity affect flow rate

Answer 3

The greater the thickness (viscosity) the greater the resistance, so increase in pressure required to move the liquid. (dehydration=increase blood pressure as body works harder to move blood round body.

Question 4

Explain Poiseuilles law and its affect on flow rate.

Answer 4

Volumeflowrateisproportional to:(tuberadius)4
The longer the tube the greater the resistance (so bigger people have vessels that are stretched and have to work harder to get blood flowing round body)

Question 5

How does type of flow affect flow rate?

Answer 5

Laminar flow is where the flow is streamlined and parallel to tube
Turbulent flow: recirculation, eddies, tube has constrictions and roughened surfaces.
Atherosclerosis: fat is deposited on tube walls, scar tissue builds up, can lead to clot forming (as continuous blood flow causes more damage to scar tissue.
This raises blood pressure, as heart has to work harder.