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March 3, 2012, 09:57 |
Preventing backflow from occuring
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#1 |
New Member
BButler
Join Date: Jan 2012
Posts: 3
Rep Power: 14 |
Im am working on a horizontal pipe resembling part of the lungs bronchioles. Instead of working with a pressure difference (between the inlet and outlet) I am focusing on volumetric flow rates therefore I am using a velocity inlet and a flow split outlet.
I am entering velocities using a time table as it is time dependent, air is entering the tube at a certain velocity for a certain time period. Then when the time is reached the velocity drops to 0 m/s and air no longer enters the tube. The problem is that when the velocity drops to zero m/s the air starts to flow backwards, this does not occur in the body. Is there anyway of entering a function or table to ensure the air flows out the tube once the velocity drops to 0m/s I want to work like an on/off switch Any help would be greatly appreciated |
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March 3, 2012, 10:19 |
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#2 |
New Member
Thomas Ziegenhein
Join Date: Feb 2012
Posts: 8
Rep Power: 14 |
you don't give the pressure difference at the pressure outlet, the pressure is depending on the wall shear stress (in a pipe). So use pressure outlet and you don't have problems with backflow. Because of continuity i think you can not deactivate the backflow.
Greetings Thomas |
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