The Effect of Differential Pressure (DP) on Filter Flow Rate Flashcards
(16 cards)
What is the relationship between differential pressure (DP) and flow rate according to Darcy’s Law?
A higher differential pressure results in a higher flow rate
What type of bed is Darcy’s filter made of?
A bed of sand
What is the characteristic of a sand bed in relation to permeability?
It is non-compressible; its bed permeability does not change during use
What happens to the grain bed’s permeability as flow rate increases?
It decreases significantly due to compression
How do mash separation devices operate in relation to differential pressure?
They operate with a low differential pressure across the grain bed
What is the purpose of connecting clear piping to the underside of the false floor of a lauter tun?
To use it as a U tube manometer to indicate pressure change beneath the false floor
What occurs to the wort level in the manometer during a stationary no-flow situation?
It rises to be at the same level as the supernatant wort
What factors influence the free flow through the grain bed at a low flow rate?
- Wort viscosity
- Grain bed permeability
- Grain bed loading
What happens to the pressure under the false floor as wort collection flow rate increases beyond the bed capability?
The pressure under the false floor drops
What does a drop in the manometer tube level indicate during wort collection?
We are trying to collect wort faster than the bed can release it
What is the term used for the difference between the pressure below the false floor and above the grain bed?
Differential pressure
What could happen if the differential pressure limit of the wort separation device is exceeded?
The false floor could collapse
What should be done if the differential pressure limit is reached during wort collection?
Reduce the wort collection flow rate
What is a simple way to monitor differential pressure?
Using a manometer
How can differential pressure be measured in automatically operated wort collection systems?
By comparing readings from pressure transmitters located both above and below the false floor
What will be examined to predict the relative wort filtration flow rate of mash separation devices?
How all of Darcy’s Law variables combine together
