Creating multiple pulsed jet gas positions in the fluidized bed

[hontranhpq]

Hello everyone,
I am a beginner to use Mfix for fluid bed simulation. I use pulsating_fluid_bed_2D TFM in Mfix and here allows to generate pulsed gas through 1 jet position. If I want to add more positions that also supply pulsed gas, what should I do?

Many thanks!
Phu Pham Quang

[jack7z]

Not exactly sure what you are asking (I’m also a beginner), but maybe add more inlets in BC?

[hontranhpq]

Yes, I want to put in many variables and I use keyframe data to add more inlets in BCs but the result can only run 01 first variable. Similar to this document:

rotating_drum.pdf

and I want to generate many variables in BC, could you help me?

[jack7z]

I see. I’ve never used keyframe before. Sorry can’t really help you…

But would it be possible to add inlets in GUI? Or maybe you have a lot of inlets and want to avoid GUI?

[gaoxi]

Please check previous similar topic:

How to simulate a bed with a perforated distributor plate

Dear MFiX help, I am planning to simulate a fluidized bed with a perforated distributor plate. I do appreciate if you can advise me what steps I have to follow to define the right geometry, region, and boundary condition for this purpose. Enclosed you can find an example file that I was working on that to make such a simulation. I used Union Boolean operation to attach some orifices to the bottom of the main cylinder. I was not able to place “Cylinder4” and “Cylinder 5” at Z center = 0.025 m a…

You can try point source inlet or create multiple regular gas mass inlet boundaries. UDF should be similar to the pulsating fluid bed tutorial.

[hontranhpq]

Thank you Gaoxi and jack7z
I tried it again and the model has worked well with multi pulsed gas jets.
Thanks again for your concern and help.
In addition, if I want the velocity of inflow gas to change according to the equation: bc_v_g = A * (B + sin (2 * pi * f * t)), where A, B = const, t = time, f = frequency
How do I correct the code in the mfix?
Thanks very much!
Phu Pham Quang

[Qianbinhui]

Hello, I recently had the same problem as you. Pulsating gas can only be applied to one inlet, and it is desired that multiple spouts use pulsating gas . How did you solve this problem? Looking forward to your reply! Best regards!