The difference between pressure and flow
- Thread starter jacko
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Pressure diffrence is what causes flow to happen.
If you have a high pressure diffrence then a large flow will be the result, unless you have some sort of restiction like a small bore pipe in between the two. This will then reduce the flow. There is a formula to calculte flow rates but i dont know what it is. One thing for sure is that if you saw into a rising main there is a LOT of flow...........
If you have a high pressure diffrence then a large flow will be the result, unless you have some sort of restiction like a small bore pipe in between the two. This will then reduce the flow. There is a formula to calculte flow rates but i dont know what it is. One thing for sure is that if you saw into a rising main there is a LOT of flow...........
Pressure is force divided by area P=F/A. Flow is movement of a substance which will have a msaa (weight divided by acceleration due to gravity m = w/a) force makes a mass accelerate
The calculation is
P = Q2 f S L K / d5
where:—
P = pressure loss, bar.
Q = flow in litre/s for liquids m2/h at 20°C and 1016 mbar for gases.
L = length of pipe, metres.
d = dia. of pipe, mm.
f = coefficient of friction.
S = specific gravity, relative to water for liquids, and relative to air for gases.
K = a constant and is 3.25x l07 for liquids, 3.05 x103 for gases.
For the full version see here
Pressure is what keeps a balloon inflated, flow is what makes it fly round the room
The calculation is
P = Q2 f S L K / d5
where:—
P = pressure loss, bar.
Q = flow in litre/s for liquids m2/h at 20°C and 1016 mbar for gases.
L = length of pipe, metres.
d = dia. of pipe, mm.
f = coefficient of friction.
S = specific gravity, relative to water for liquids, and relative to air for gases.
K = a constant and is 3.25x l07 for liquids, 3.05 x103 for gases.
For the full version see here
Pressure is what keeps a balloon inflated, flow is what makes it fly round the room
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