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-   -   gas-liquid system modeling? (http://www.cfd-online.com/Forums/fluent/31475-gas-liquid-system-modeling.html)

x.p.lee May 14, 2003 21:33

gas-liquid system modeling?
 
Hello to all How to model the flow field induced by bubbles produced in fluid? Bubbles distribute evenly beneath the bottom of the reactor with a diameter of about 1 centimeter,show in Fig.. Because of the buoyancy bubbles will be discharged from the bottom edge then drag the liquid to form a flow field.

| | bottom of reactor | |

|----|________________________|------|

| O O O O O O !!!-|!!bubbles

| liquid |

|____________________________________| I don't know how to use Fluent to model this system,and especially how to define the boundary conditions. If the bottom of the reactor is sloped, the bubbles will move in one direction along the bottom, maybe it will be easier to simulate, please tell me how to. I would appreciate any help from you, thanks!

Alex Munoz May 15, 2003 00:18

Re: gas-liquid system modeling?
 
Hi

Talk to winnie, he is working in a simmilar problem, you can find his e-mail address in this forum

Regards

Alex Munoz

winnie May 15, 2003 09:50

Re: gas-liquid system modeling?
 
Hi

I am simulating a similar case, the difference is that my continuous has an initial laminar flow field.

I think your case can be simulated using Discrete phase model or Eulerian model in fluent. It depends on the result you want to get. In my opinion, DPM can give me more information about forces on the bubble and bubble trajectory, but it has volume limitation.

You can read the fluent document first to decide which one you choose, and if you begin your simulation, keep in touch with and maybe we can help each other!

Regards

winnie

rookie June 12, 2003 20:54

Re: gas-liquid system modeling?
 
Hello Winnie,

Could you model vaporization and condensation? I knew it is ok to model vaporization in DPM, but I am not so sure about the condensation. Any idea?

Thanks

Rookie

winnie June 12, 2003 21:24

Re: gas-liquid system modeling?
 
Hi, rookie

In my case, there is no mass transfer between bubble and fluid, so I am not familiar with vaporization or condensation. But I noticed that in DPM DEFINE Macros, you can use the DEFINE_DPM_LAW macro when you want to customize laws for particles. Maybe you can try it. Just a suggestion.

Regards

winnie



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