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nozzle-diffuser 2-D vs peristaltic pump

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Hi, I now currently on the simulation track at nozzle-diffuser design.
I refer to the peristaltic pump model which gain from the model library.

However, I face some problem with the volumetric flow rate and net flow rate.

For inflow, the boundary integration is Vin=2*pi*r*v, does any one have idea why 2*pi*r is used instead of pi*r*r, since, volume is the integration of area.

Regarding the netflow,I observe there is an equation:
netflow=netflowt-(inflow +outflow)/(2*Ttot)

but I cannot find any netflowt value inside.

Appreciate for expert help and advise.

Thanks.

0 Replies Last Post 1 mar 2011, 03:40 GMT-5
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