Modeling a Diaphragm Pump

TiagoFC · February 24, 2016, 21:03

Hello, guys,

I'm having a problem modeling the boundary conditions of a diaphragm pump. I already have the dynamic mesh of the moving diaphragm and the two check valves modeled, but I don't know what boundary conditions to set at the inlet and outlet. I have the mass flow/velocity for the inlet (and also can know the pressure), but I don't have any information about the outlet (and I want to know the pressure of the fluid coming out of the pump). Do you guys have any suggestions? Thank you very much!

Gourav · April 16, 2016, 19:41

Did you figure it out?

TiagoFC · May 16, 2016, 17:49

Yes. I was understanding the membrane (or diaphragm) pump wrong. By definition, both inlet and outlet pressure are specified, they are design characteristics.

Isuart · February 7, 2019, 18:29

Hi, I don't have a exactly answer for you but you need to do your model a have a single unique solution for the equations that you need to solve.

So you can put the velocity in the inlet and the pressure in the outlet. The atmosferic or gaue pressure is good.

February 24, 2016, 21:03	Modeling a Diaphragm Pump	#1
TiagoFC New Member Tiago Fonseca Costa Join Date: Jun 2015 Posts: 9 Rep Power: 11	Hello, guys, I'm having a problem modeling the boundary conditions of a diaphragm pump. I already have the dynamic mesh of the moving diaphragm and the two check valves modeled, but I don't know what boundary conditions to set at the inlet and outlet. I have the mass flow/velocity for the inlet (and also can know the pressure), but I don't have any information about the outlet (and I want to know the pressure of the fluid coming out of the pump). Do you guys have any suggestions? Thank you very much! Gourav and navid.a like this.

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April 16, 2016, 19:41		#2
Gourav New Member Gourav Join Date: Jun 2014 Posts: 6 Rep Power: 12	Did you figure it out?

May 16, 2016, 17:49		#3
TiagoFC New Member Tiago Fonseca Costa Join Date: Jun 2015 Posts: 9 Rep Power: 11	Yes. I was understanding the membrane (or diaphragm) pump wrong. By definition, both inlet and outlet pressure are specified, they are design characteristics.

February 7, 2019, 18:29		#4
Isuart New Member Pablo Isuart Join Date: Nov 2017 Posts: 1 Rep Power: 0	Hi, I don't have a exactly answer for you but you need to do your model a have a single unique solution for the equations that you need to solve. So you can put the velocity in the inlet and the pressure in the outlet. The atmosferic or gaue pressure is good.