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Old   October 17, 2000, 23:01
Default Semi-batch process
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Jonac
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CFX Users

A semi-batch system is of continuous input but no output. Say a gas liquid/solid system with weakly compressible flow specified to the gaseous fluid, then how to set up the no output of the system without upsetting the mass balance in CFX?

Any comment is welcome and much appreciated.

Jonac

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Old   October 18, 2000, 06:51
Default Re: Semi-batch process
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Gert-Jan van der Gulik
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I am not sure if you can solve such a problem without making simplifications or using some Fortran-tricks.

Therefore: What is of interest in your simulation i.e. what is the problem you want to solve? Are you interested in the flow of the liquid or feed mixing? Or are you interested in the flow of the gas? Or perhaps both?

Regards, Gert-Jan
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Old   October 22, 2000, 19:56
Default Re: Semi-batch process
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Jonac
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Gert-Jan

The problem will be focussed on inter-phase mass transfer between gas and liquid followed by chemical reaction in an agitated vessel.

Could you elaborate the possible simplification can be carried out, please?

Thanks
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Old   October 23, 2000, 03:22
Default Re: Semi-batch process
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Gert-Jan van der Gulik
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Jonac,

I guess you have a vertical vessel to which gas is fed at the bottom through some gas inlet. Then why do you want to leave out the gasoutlet (i.e. leaving out the degassing boundary in CFX 4.3). Is the obtained pressure increase really that important for the process under study?

Gert-Jan
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Old   November 8, 2000, 21:06
Default Re: Semi-batch process
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Jonac
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Gert-Jan

We have solved the problem for now by specifying inlet as pressure boundary condition and no outlet in the system physically. The reason for preserving the semi-batch feature is because the gradual accumulation of the gas pressure in the head space of a vessel directly influences the solubility of the gas reactant in the reaction mixture and hence the reaction rate.

Cheers
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Old   November 10, 2000, 05:23
Default Re: Semi-batch process
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Gert-Jan van der Gulik
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Jonac,

Such a problem is hard to simplify and this looks a good approach. Good luck.

Gert-Jan
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