October 23, 2018 at 6:41 amJamessmp23Subscriber
I tried to simulate the airlift bioreactor using euler-euler multiphase method with k-epsilon standard for study the flow patterns but got stuck at the sparger setup.
Does fluent can setup the desire bubble diameter and flow rate from the sparger (frame motion from the solid geometry) or do I have to draw a geometry with many small tube for the gas inlet.
Can anyone suggest sparger, airlift reactor on ANSYS fluent tutorials ? or any suggestion about the method that I used ?
October 23, 2018 at 7:05 amKeyur KanadeAnsys Employee
You can use eulerian multiphase model. Please define phases correctly.
Please check following video
October 23, 2018 at 7:51 amDrAmineAnsys Employee
The video shared by Keyur is good start for you. The bubble diameter is an input which needs to be provided by you. You can imagine that bubbles might grow, collapse and coalescence with other bubbles and this might require a dynamic bubble diameter definition. All this can be done in Fluent.
there is no explicit tutorial for Airlift reactor in Fluent but you can find several papers where Fluent or CFX has been used for for the simulation parts.
October 27, 2018 at 6:29 amJamessmp23Subscriber
October 27, 2018 at 9:56 amDrAmineAnsys Employee
If you initialize with zero volume fraction for air then the reactor is completely filled with the pimary phase: water.
October 29, 2018 at 6:00 amKeyur KanadeAnsys Employee
Yes, as Amine pointed out, you can patch vof of water with value 1 or vof of air with value zero.
October 29, 2018 at 8:40 amJamessmp23Subscriber
I had tried patched the volume of air = 0 or volume of water = 1, the result is air cannot flow into the reactor.
For now I patched the volume of air in the fluid domain as 0.2, the result is air can flow and circulated in the reactor but still have the problem on flow patterns from the draft tube, so now I comparing on the meshing step which are (1) set draft tube geometry as constructed geometry (2) set as default and mesh sizing (1e-2).
Thank you to all for replying back, I will check this topic as Is Solution.
August 6, 2019 at 3:22 pmgboshSubscriber
I am new to fluent and I am having a difficult time getting the right circulation for my airlift reactor simulation. I have used a 2D geometry, the Euler-Euler multi-phase method, k-epsilon for turbulence. I set the inlet boundary condition as air velocity = 0.25 m/s and zero for water, volume fraction for air as 1. But it seem not to recirculate and has a very funny flow pattern. it won't go through the riser. I was finally able to get it to go through the riser using the eulerian model and setting the outlet to degassing, but still no re-circulation.
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