I need to know how much water can flow through the flow and return pipes on my mid-engined car and wondered if anyone has a formula for the calculation.

Any help would be gratefully received,

Thank you.

Won't it depend on how much pressure the water pump is making?

All depends on you pump rate, temp and pressure.

Best way is to have a look on the donor and wee what it uses IMO.

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Originally posted by coozer

Best way is to have a look on the donor and wee what it uses IMO.

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http://www.copper.org/publications/pub_list/pdf/copper_tube_handbook.pdf will give pressure losses over lengths of pipes of various sizes but that would be water.

Add coolant and temperature and it'll all go a bit wonky.
28mm pipe flows a lot, I doubt it'd be a problem really

Here's the formula Bernoulli's

Here's the formula Bernoulli's

I don't think it gives flow.

Ben, Pressure after a certain point will make no difference to the flow which will be dependant on the tube diameter and length.

Coozer My donor was FWD. My car is a Midi.

Thank you for your replies

Not really.

Sure the laminar flow will have a terminal flow rate but for turbulent flow there is not the same ceiling and we want turbulent flow 'cos it scours and increases heat transfer. OK the backpressure increases but are we worried?

I would consider 32mm ally tube as a unofficial standard cheaply available, as pointed out by - damn just had a senior moment- from B&Q tv ariel pipe.

Will transfer more heat than your heart could desire - around 50kw laminar and oodles more turbulent

http://www.plumbingsupply.com/flow_charts_for_pipes.html

this should give you an idea.

if you know the flow rate of your current 15mm setup its around 50% more at best.

if its for a shower which is the normal reason people are upgrading pipe then just calculate on the 15mm pipe.

use a 10 ltr bucket to calculate litres per min. gets you flow rate. x 50% gives you a rough idea.

if i got wrong end of stick sorry.

it does state on the site that it can take nearly double but thats if the pressure is super high.



dave

[Edited on 2/7/10 by jossey]