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Author Physics question : pressure from flow rate
RichR
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Registered: 17th Oct 01
Location: Waterhouses, Staffordshire
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23rd Jul 09 at 15:45   View Garage View User's Profile U2U Member Reply With Quote
How do you convert flow rate (125 l/min) into pressure (bar) given the constants of a 38mm bore pipe; and 1025kg/m3 density of fluid.

I haven't done it in ages and can't remember!


[Edited on 23-07-2009 by LiVe LeE]
Ellis
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Registered: 11th Sep 07
Location: Aberdeenshire
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23rd Jul 09 at 16:04   View User's Profile U2U Member Reply With Quote
Reynolds number?

I can't remember either
Ellis
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Registered: 11th Sep 07
Location: Aberdeenshire
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23rd Jul 09 at 16:15   View User's Profile U2U Member Reply With Quote
Q = A x V for a start

Transpose for V...

Then I don't know yet

EDIT: If you do it, post it up as it's annoying me and I'm away out

[Edited on 23-07-2009 by Ellis]
Bart
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Registered: 19th Aug 02
Location: Midsomer Norton, Bristol Avon
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23rd Jul 09 at 16:36   View User's Profile U2U Member Reply With Quote
Reynolds number is re=Pud / n

P= fluid density,
U= average fluid velocity
d= pipe diammeter
n= absolute viscosity

And thats reading from my 3 year old college notes.. I will see if I have any similar questions.....
Bart
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Registered: 19th Aug 02
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23rd Jul 09 at 16:40   View User's Profile U2U Member Reply With Quote
Whats your entire question Lee? is it for college?
RichR
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Registered: 17th Oct 01
Location: Waterhouses, Staffordshire
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23rd Jul 09 at 20:42   View Garage View User's Profile U2U Member Reply With Quote
no not for college/uni - I'm specifying a coolant water hose for a twin 315hp installation on a new boat.

The Sea water pump has a capacity of 125litre/min and the hose bore is 38mm. I need to work out wether the one I'm specifying has a high enough suction rating and won't collapase underload.

We've never had a problem but this particular customer wants all the calcs showing. My notes are back at home so I'll look tomorrow night

 
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