Sciencey odd question just occured in my daily musings...

[ecowarm]

It soooo simple

[h=3]Flow in Pipe[/h]For flow in a pipe or tube, the Reynolds number is generally defined as:[SUP][6[/SUP]

where:

• D[SUB]H[/SUB] is the hydraulic diameter of the pipe (m).
• Q is the volumetric flow rate (m[SUP]3[/SUP]/s)
• A is the pipe cross-sectional area (m²).
• 
  is the mean velocity of the object relative to the fluid (SI units: m/s)
• μ is the dynamic viscosity of the fluid (Pa·s or N·s/m² or kg/(m·s))
• ν is the kinematic viscosity (ν = μ / ρ) (m²/s)
• 
  is the density of the fluid (kg/m³)

 

[fuzzy]

are you really reynolds ecowarm?

 

[diamondgas]

Are we getting volume mixed up with pressure? It's a common one!!

If you had a 25 mile piece of pipe totally filled with water and you pushed your finger in one end I'd expect the same amount of water to be displaced at the other end! With minimal resistance yeh? It wouldn't be solid, it's a liquid, they act in different ways, it's mass isn't a factor if gravity is equal throughout it's length.... But like a syringe or piston.

A pump works on moving water using centrifugal force, it doesn't 'push' or 'pull' it spins and throws water about, sucks it up the middle and throws it out the ends of the impellar! There's a limit to how much mass it can move yeh?

 

[fuzzy]

Are we getting volume mixed up with pressure? It's a common one!!

If you had a 25 mile piece of pipe totally filled with water and you pushed your finder in one end I'd expect the same amount of water to be displaced at the other end! With minimal resistance yeh? It wouldn't be solid, it's a liquid, they act in different ways, it's mass isn't a factor if gravity is equal throughout it's length.... But like a syringe or piston.

A pump works on moving water using centrifugal force, it doesn't 'push' or 'pull' it spins and throws water about, sucks it up the middle and throws it out the ends of the impellar! There's a limit to how much mass it can move yeh?

that made my laugh very very much, the thought of one of us running 25 miles of pipe, leaving one of us at one end while the other went to the start and push the water with a finger, lol

we will have to do this or this thread will never come to a conclusion!

how much does 25 miles of 22mm water weigh?

 

[diamondgas]

Hey we're all scientists now!! :rofl:

 

[diamondgas]

that made my laugh very very much, the thought of one of us running 25 miles of pipe, leaving one of us at one end while the other went to the start and push the water with a finger, lol

we will have to do this or this thread will never come to a conclusion!

how much does 25 miles of 22mm water weigh?

I'm in Newcastle fuzzy, where you? I think we should use plastic mind, the copper'll be nicked!!

 

[fuzzy]

were do you live, im in merseyside, ill go to my tap now and push the water, let me know if it comes out, give me 1 minute

 

[fuzzy]

did it move lads???? i bet ive created loads of leaks, i gave it a firm push

 

[diamondgas]

:rofl: fuzzy ... I'm up hill so that'll have to make a difference :rofl:

 

[fuzzy]

my neighbors just been round with an unexplained water surge from all outlets, deny everything

 

[ecowarm]

Pressure Drop: Calculation of pressure drops in pipes look here save all the messing about

 

[fuzzy]

spoil sport

 

[stevetheplumber]

we once joined 5 long hose pipes together to refill a pond and it barely trickled out despite being on a main

 

[fuzzy]

over 50,000 meters it drops 58,000 bar!!!! yikes

 

[fuzzy]

we once joined 5 long hose pipes together to refill a pond and it barely trickled out despite being on a main

lies, pure utter lies

 

[fuzzy]

it was a swimming pool

 

[unguided1]

Ah so the water is not fully contained fully and subject to evaporation, expansion, contraction plus its not pure water as it has chemicles in it

 

[fuzzy]

i clicked 'like' unguided, im not sure why because i dont understand what you posted, im sure if i did understand i would have liked it

 

[unguided1]

If I knew what I was talking about half the time I would sound more intelligunt than I look!!!!!!!!!!!!

 

[unguided1]

Sorry but I have to say that chemicles in swimming pools are really interesting I recall back in 1990 I was learning to scuba dive with a local BSAC club and they used to use a girls school swimming pool, anyway after a rather energetic pool session doing diver rescues I commented to one of the caretakers that I had never been in a salt water pool before. whent back a week later and the pool had been drained and fresh chlorine put in !!!!!!!!!!!

 

[quality]

I could not be bothered to read all the other posts , But to the OP - pressure volume flow mass are all proportional
Pressure is force / area ie, pounds of weight over inch of area or metric equivalent.

1 pound of weight on 1 square inch is 1 psi

All you need is the mass (weight) and the pressure (force) and the density (volume) then its simples

 

[fuzzy]

your so last year quality, weve surpassed that, some bloke called reynolds got involved, it all went pear shaped then

are you up for our ukplumbingforum experiment?

 

[quality]

your so last year quality, weve surpassed that, some bloke called reynolds got involved, it all went pear shaped then

are you up for our ukplumbingforum experiment?

Its been a long day but yeh I am up for anything

 

[fuzzy]

do you have 25 mile of copper on the van?

diamondgas wants to do it in speedfit, but i think thats cheating, in fact ive decided hes a big wuss now and i o longer consider him a real plumber, psss, dont tell him

how about doing it in iron? ive got some hand dies

 

[quality]

Their big them dies then