Learning Forum

[Anshul]

[Rob]

Particle surface reactions are for the DPM model, which you're not using. n

[Anshul]

Thanks nAlso, there is one more confusion regarding this packed bed catalytic porous model:nWhen I switch on porous tab in cell zone condition, then in reaction tab I need to enter surface to volume ratio. As in my case it is packed bed case having reaction volumetrically (Not surface reaction), so I am putting this value to 1. But I am not sure about this value.nPlease help me in clearing this doubt.nAttached are the things which I found on FLUENT user guide about this S/V ratio. nn

[Rob]

In a packed bed you react on the packing surface, ie the whole point of the packing is to increase surface area and/or contact time. For background reading the Coulson & Richardson Chemical Engineering books are very good, think it's Vol 1 and Vol 6 but as mine are in the office I can't check. n

[Anshul]

Hi,nThe paper which I am using for my model validation is simulated in self developed CFD code. The solution methodology for the same is given as:nIn FLUENT, all these methods are not available, so I am using following solution scheme:nPlease help me in this if I am doing it in right direction. Does this variation will affect the results when compared to the paper.n(P.S. PRESTO is used due to porous catalytic bed)nAnshuln

[Anshul]

nAbout the surface to volume ratio, I have gone through the book that you suggested, but I am not able to find what I need. In reaction tab of cell zone condition. I need to enter this numerical value. Till now I am using 1 for packed bed case. Although for surface it will not equal to 1.nPlease see if you can help me in taking this value or I am doing right by using 1 for packed bed case.nAnshuln

[Rob]

In your packed bed media you'll have a surface coefficient or the like. Ie for Raschig rings in a packed bed the available surface area is many m2 per m3 of packing. n