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Tomparis 10
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Join Date: Oct 2008
Posts: 1

Volume flow rate

10/19/2008 5:54 PM

Is there a way to calculate the volume flow rate of a duct from reading the flow rate and measuring the duct outlet size?

Meters per second to meters per second cubed?
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osborne83
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Join Date: Sep 2008
Posts: 141
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#1

Re: Volume flow rate

10/19/2008 6:12 PM

Just multply the velocity by the flow area. Meters/second x square meters.

This only works for low veloicity flow (no compressibility effects)and discounts boundary layer effects. It is, however, probably good enough for flow velocities of less than 100 meters/second.
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Anonymous Poster
#6
In reply to #1

Re: Volume flow rate

10/20/2008 3:44 PM

Cheers osbourne.That will do nicely!

Using calculation for checking if mechanical ventilation to boiler room is suffcient.Present aneometer only measures in m/s.

Thanks again.
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osborne83
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Join Date: Sep 2008
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#7
In reply to #6

Re: Volume flow rate

10/21/2008 12:04 AM

Then I'd guess that you are not running choked flow in that application....
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DVader1000
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#2

Re: Volume flow rate

10/19/2008 8:43 PM

Actually, that should be meters cubed per second.

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ducon
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Join Date: Dec 2006
Location: Hop around Toronto, New York & Karachi
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#3

Re: Volume flow rate

10/19/2008 11:54 PM

Refer site " the engineeringtools.com" they refer you formulas and graphs for this purpose.

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amiruddin
Member

Join Date: Oct 2008
Location: Melbourne, Australia
Posts: 7
#4

Re: Volume flow rate

10/20/2008 1:05 AM

Hi

Yes there are so many way to calculate volume flow rate.

volume flow rate cubic meter per hour = velocity (speed) meter per hour multiply by Area of duct (opening) in square meter.

now a days there are so many instrument which give directly flow rate, you no need to do any calculation.
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Anonymous Poster
#5
In reply to #4

Re: Volume flow rate

10/20/2008 11:40 AM

The Basics are here.

Q=AV

Q=Flow rate In m3/sec

A= cross sectional areaOf conduict in m2

V= Velocity in m/sec.
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amiruddin (1); Anonymous Poster (2); ducon (1); DVader1000 (1); osborne83 (2)

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