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mupwi
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Join Date: Oct 2008
Location: Durban; South Africa
Posts: 43
Good Answers: 1

Gas Flow Calc

10/06/2010 7:40 AM

I am trying to work out how much air l/min will flow out of an orifice of 1mm to the open air when the supply presure is 10 bar Im sure there must be a formula for this but even googeling I cant find it maby im asking the wrong question
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JohnDG
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United Kingdom - Member - Not a New Member Hobbies - Musician - New Member Hobbies - Fishing - New Member

Join Date: May 2006
Location: Reading, Berkshire, UK. Going under cover.
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#1

Re: Gas Flow Calc

10/06/2010 7:51 AM

Look here:

http://www.smc.eu/portal/WebContent/local/UK/Pneu_Book/pneubook.pdf

... pages 1A.7 et seq.

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woodygb
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Join Date: Mar 2009
Location: United Kingdom
Posts: 308
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#2

Re: Gas Flow Calc

10/06/2010 7:56 AM

The flow will be sonic and the edges of the hole have an infuence on the flow thru it.
It's possible to get a derived Cv coefficient from your hole dia and use this value in a std flow calc.


http://www.spiraxsarco.com/resources/calculators/orifice/orifice-diameter-to-flow-coefficient.asp

NOTE: Click on the ? for help http://www.spiraxsarco.com/esc/eng/help/miscellaneous_orificekv_eng.asp

http://www.google.co.uk/#hl=en&biw=1003&bih=587&rlz=1R2GGLL_en-GB&q=sonic+flow+through+an+orifice&aq=6&aqi=g10&aql=&oq=+SONIC+FLOW&gs_rfai=&fp=438020bd52aa0dd7
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mupwi
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Join Date: Oct 2008
Location: Durban; South Africa
Posts: 43
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#3

Re: Gas Flow Calc

10/06/2010 9:12 AM

ok this all seems way over my head I think ill just drill the 1mm hole and watch my presure gage with stopwatch in hand
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woodygb
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Join Date: Mar 2009
Location: United Kingdom
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#4
In reply to #3

Re: Gas Flow Calc

10/06/2010 9:58 AM

My estimate is around 65 l/min
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mupwi
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Join Date: Oct 2008
Location: Durban; South Africa
Posts: 43
Good Answers: 1
#5
In reply to #4

Re: Gas Flow Calc

10/06/2010 11:03 AM

thanks a milion woody these flow calculations just seem to way over my head maby thats why I did electrical :)
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