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How to separate flow in two outputs as 70:30? |
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December 27, 2013, 19:48 |
How to separate flow in two outputs as 70:30?
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#1 |
New Member
Join Date: Dec 2013
Posts: 4
Rep Power: 12 |
Hi. I have a 2d tube. In this tube with diameter D0 i have as inlet a constant velocity U. I call this tube Mother tube.
Then this tube is separated in two smaller tubes (daughter tubes) of different sizes (say D1=D0/2 and D2=D0). Each output is= "Type:Pressure-outlet" with zero Gauge Pressure and the Backflow direction is set to default "Normal to Boundary". How can i have a constant flow ratio 70:30 in the outlets of the daughter tubes, of D2(70) and D1(30)?? I try to do it like that in the first daughter tube: I clicked the "Target Mass Flow Rate" and then in the "Target Mass Flow" box i input the number: 0.3*(A*U*m) where: A= area of mother tube U=Velocity of the fluid in the mother tube M=mass (Density) of the fluid in mother tube. And for the other daughter tube i did:0.7*(A*U*m) Is this the correct way to tell Fluent that i want a flow ration of 70:30 at the two outputs? Thank you |
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December 28, 2013, 13:30 |
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#2 |
Senior Member
François Grégoire
Join Date: Jan 2010
Location: Canada
Posts: 392
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Hi Spiros,
What are the results? Did you obtain the targeted mass flow rates? What pressures Fluent calculated at the outlets? I think your approach is ok, and depending on the shape of your geometry, Fluent will adjust the pressure at the outlets in order to obtain the targeted flow rates. |
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December 28, 2013, 14:10 |
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#3 |
New Member
mj
Join Date: Apr 2011
Posts: 24
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I think by using velocity outlet BC, you can separate them easily. just need to define two Velocity outlet BC with 0.7 and 0.3 outflow rate
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December 28, 2013, 14:34 |
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#4 | |
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Quote:
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December 28, 2013, 14:36 |
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#5 |
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December 29, 2013, 04:38 |
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#6 |
Senior Member
Join Date: Jan 2010
Location: Germany
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If you are sure that the flow is fully developed and you are working with incompressible fluid you may use outflow BC with mass weightening (without any pressure level specification at the Boundaries)
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flow ratio |
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