bubble breakup and coalescenc

March 18, 2006, 08:45

Can we implement bubble breakup and coalescence using fluent?

March 18, 2006, 09:06

yes with the help of udf..

March 18, 2006, 09:31

Hello Guys, With Regards to PBE in FLUENT following are my pointers; 1. Yes it could be done with a UDF, 2. BUT now in upcoming versions of FLUENT 6.3 it is ported in built and can be obtained via a special license; it is like a add on, 3. The new version has three approaches to solve or to be specific to integrate PBE they are; DPB, QMOM, Standard method of moments, 4. It has inbuilt breakage and coalescence models. For breakage it carries Luo and Svendsen (1996) and for coalescence it carries Luo (1993) model. It has been well validated for bubble columns and crystallization. you can check on these listed references for the theory of model in FLUENT. Let me know you coordintes and I will be happy to answer your querries in these regards! Following are the references you may like to consider: Chen, P., J. Sanyal and M. P. Dudkuvoic, 2005. "Numerical Simulation of Bubble Columns: Effect of Different Break up and Coalescence Closures", Chem. Eng. Sci., 60, 1085-1101. There are few more from the same gropu which I leave for you to figure out. With all that I should add few caution notes: 1. PBE is a fine tuning to the problem, 2. In order to have a good estimate of the results one must look into interphase closure techniques and schemes. For instance bubble columns, pipe require accurate description of them. 3. Computational requirements are high in this problem hence acess to clusters or supercomputers may seem to be desirable. Few books which you can begin with are; Ramkrishna D. (2000) Population Balances: Theory and Applications to Particulate Systems in Engineering. Academic Press: New York.

KP

March 18, 2006, 10:44

Thanks for the information.But i am using FLUENT 6.1 version.so, i have to write UDF.can u give me some guidelines in writing UDF.

March 18, 2006, 10:48

What kind of guideline you want. Be more specific so that I can "think" of sharing the knowledge! As I said its not stright forward. May be you should upgrade your FLUENT. The implementation was a Ph. D topic at Wash. U so...Let me know what you feel!

March 18, 2006, 11:18

Is it tough to write a UDF?

March 18, 2006, 11:23

No it is not. But time consuming. Instead up grade FLUENT its already done.

March 18, 2006, 12:00

Thanks.let's see what can i do.

March 18, 2006, 08:45	bubble breakup and coalescenc	#1
ab Guest Posts: n/a	Can we implement bubble breakup and coalescence using fluent?

March 18, 2006, 09:06	Re: bubble breakup and coalescenc	#2
shanu Guest Posts: n/a	yes with the help of udf..

March 18, 2006, 09:31	Re: bubble breakup and coalescenc	#3
KP Guest Posts: n/a	Hello Guys, With Regards to PBE in FLUENT following are my pointers; 1. Yes it could be done with a UDF, 2. BUT now in upcoming versions of FLUENT 6.3 it is ported in built and can be obtained via a special license; it is like a add on, 3. The new version has three approaches to solve or to be specific to integrate PBE they are; DPB, QMOM, Standard method of moments, 4. It has inbuilt breakage and coalescence models. For breakage it carries Luo and Svendsen (1996) and for coalescence it carries Luo (1993) model. It has been well validated for bubble columns and crystallization. you can check on these listed references for the theory of model in FLUENT. Let me know you coordintes and I will be happy to answer your querries in these regards! Following are the references you may like to consider: Chen, P., J. Sanyal and M. P. Dudkuvoic, 2005. "Numerical Simulation of Bubble Columns: Effect of Different Break up and Coalescence Closures", Chem. Eng. Sci., 60, 1085-1101. There are few more from the same gropu which I leave for you to figure out. With all that I should add few caution notes: 1. PBE is a fine tuning to the problem, 2. In order to have a good estimate of the results one must look into interphase closure techniques and schemes. For instance bubble columns, pipe require accurate description of them. 3. Computational requirements are high in this problem hence acess to clusters or supercomputers may seem to be desirable. Few books which you can begin with are; Ramkrishna D. (2000) Population Balances: Theory and Applications to Particulate Systems in Engineering. Academic Press: New York. KP

March 18, 2006, 10:44	Re: bubble breakup and coalescenc	#4
ab Guest Posts: n/a	Thanks for the information.But i am using FLUENT 6.1 version.so, i have to write UDF.can u give me some guidelines in writing UDF.

March 18, 2006, 10:48	Re: bubble breakup and coalescenc	#5
KP Guest Posts: n/a	What kind of guideline you want. Be more specific so that I can "think" of sharing the knowledge! As I said its not stright forward. May be you should upgrade your FLUENT. The implementation was a Ph. D topic at Wash. U so...Let me know what you feel!

March 18, 2006, 11:18	Re: bubble breakup and coalescenc	#6
ab Guest Posts: n/a	Is it tough to write a UDF?

March 18, 2006, 11:23	Re: bubble breakup and coalescenc	#7
KP Guest Posts: n/a	No it is not. But time consuming. Instead up grade FLUENT its already done.

March 18, 2006, 12:00	Re: bubble breakup and coalescenc	#8
ab Guest Posts: n/a	Thanks.let's see what can i do.