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Contributor
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Registered: ‎07-19-2013
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Bulk planar volumetric flow rate

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01-31-2014 06:10 AM

Could someone explain to me what the planar volumetric flow rate is based on?

 

I'd assumed that it was the total flow passing through a region of a plane, but it appears that may not be the case.

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Registered: ‎10-02-2012

Re: Bulk planar volumetric flow rate

02-03-2014 06:48 AM in reply to: RobTipples

From what I understand, it is bulk (mass weighted) average.

 

More formally, it is area averaged.png

 

where phi is the parameter (flow, velocity, pressure etc) and rho, v, dA being local density, velocity vector and area vector of the local element. The integration done over the plane through which flow is happening.

So depending on the mesh distribution the results may be different. Hence you would want mesh sensitivity analysis be done.

 

Contributor
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Registered: ‎07-19-2013

Re: Bulk planar volumetric flow rate

02-03-2014 06:52 AM in reply to: RobTipples

Cheers for the reply. That explains why it is that the flow through a collection of coarsley meshed nozzles does not equal the total flow into the system.