Fluid velocity

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levrusgk
Posts: 3
Joined: Wed Jun 02, 2010 3:18 pm

Fluid velocity

Post by levrusgk » Wed Jun 02, 2010 3:30 pm

I was using the AIR FLOW calculator, and I think there is a BUG in the way it calculates linear velocity.

EXAMPLE:
Q=0.01 m3/s
D=0.01m
Area=pi*D/4 = pi*0.01/4 = 0.00785m2

Velocity (v1) = Q/area = 0.01/0.00785 = 1.273m/s
**********************************************************************
The calculator, however, reports a Velocity value of 21.45m/s..

Pls SHOW ME THE LIGHT, thanks

Lev

admin
Site Admin
Posts: 361
Joined: Mon Feb 08, 2010 7:47 pm

Re: Fluid velocity

Post by admin » Wed Jun 02, 2010 7:02 pm

you should use D^2 in area formula, and I get 127 m/s with calculator, for Q=0.01 m3/s and D=0.01 m
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levrusgk
Posts: 3
Joined: Wed Jun 02, 2010 3:18 pm

Re: Fluid velocity

Post by levrusgk » Thu Jun 03, 2010 8:11 am

Completely agree, stupid mistake, but thanks a lot for your help and the great website!

Lev

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