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-   -   Packed Bed Reactor (http://www.cfd-online.com/Forums/fluent/44321-packed-bed-reactor.html)

 shankar reddy April 2, 2007 08:30

Packed Bed Reactor

Hi all, I am doing a project regading Packed Bed Reactor. And i have done 2d case very easily now the problem with 3d case. I am not getting how to create a geometry and meshing for packed bed reactor in GAMBIT.I need to insert solid spheres in cylinder. And i need to specify two phases like solid as well as liquid. if any one know about this pls help me. with advance, Thank you very much

 margaret mkhosi April 6, 2007 15:23

Re: Packed Bed Reactor

Can you explain more on the actual problem you are solving, maybe I can help. I have modeled a pebble bed in Gambit even though it was not in a cylinder.

 shankar April 7, 2007 15:37

Re: Packed Bed Reactor

Thank u for your response Margaret, my packed bed contain the following specifications. length of the column-1m and diameter of the column-5.5cm packings diameter -16cm(sphere) here i finished my geometry with like an structured packing.. like i arranged the down rows with 4 spheres in square format arrangement, and then i arranged next row of spheres at center of the squares of the below row... while i was going to this packing one of my friend suggested me to give the orientation of 6 or 7 degrees to spheres like tat.. how to do that? And then which type of meshing will be preferable for packings (spheres) and cylinder for getting fine grid. thank u sir,for taking interest to clarify my doubts and spending your valuable time to me. shankar

 margaret mkhosi April 8, 2007 11:47

Re: Packed Bed Reactor

Shankar, I have found out from my case that unstructured mesh works best. Also, are the spheres in contact with each other, if so, you may need to separate them a little bit. One approach that I found helpful was to determine symmetry of the model and maybe just model a small portion of the bed, like one-fourth or even one-eighth of the model, that way you will deal with smaller mesh that Gambit can handle. You may also want to use size-functions in order to handle the gaps between the pebbles as well as to have very fine mesh near the walls. I hope this helps.

 amitkumar June 30, 2012 03:01

Quote:
 Originally Posted by shankar reddy ;140569 Hi all, I am doing a project regading Packed Bed Reactor. And i have done 2d case very easily now the problem with 3d case. I am not getting how to create a geometry and meshing for packed bed reactor in GAMBIT.I need to insert solid spheres in cylinder. And i need to specify two phases like solid as well as liquid. if any one know about this pls help me. with advance, Thank you very much
shankar reddy i am doing project in packed bed reactor (gas phase on catlyst) in 2d.please tell me the step how to make geometry in ansys12. it is necessary to make catlyst in ractangle in 2d. please tell me the complete step of modeling

 bhavinshah36 October 14, 2013 05:39

Can anybody tell me how can i create a random packed bed with spheres inserted in the cylinder using Gambit ????? My D/dp ratio is 5.
This thing can be done in STAR-CCM+ but I don't have an access. So if somebody can tell me where can I download it ?

bhavinshah36@gmail.com