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February 13, 2014, 23:08 |
Population Balance Modeling (DQMOM setup)
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#1 |
New Member
Manjunath
Join Date: Dec 2012
Location: Salt Lake City, Utah, USA
Posts: 14
Rep Power: 14 |
Hello Fluent users,
My problem has gas and liquid phases with gas as my secondary phase in a stirred tank and I am using PBM to investigate the size distribution. What the three DQMOM phases to be used in the DQMOM and how are they defined? Does the three phase have to do with the initial particle or bubble size distribution? Is it necessary to define three phases? (Fluent throws a pop up window saying three DQMOM phases must be selected). I could not find much information on model setup in the theory and user guide. Thanking for the help in advance. Regards, Manjunath |
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August 25, 2014, 05:15 |
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#2 | |
New Member
Ouyang Zailong
Join Date: Apr 2014
Posts: 5
Rep Power: 12 |
Quote:
I intend to use eulerian approach coupling with PBM model to obtain local BSD in a tank, but i am running into issues on QMOM/DQMOM setup in fluent too. Could you tell me the specific mean on setting three DQMOM phases and how to initial the moments on inlet boundary if you have solved your problems. Best regards. waouyouy |
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September 29, 2014, 21:10 |
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#3 | |
New Member
Eduardo da Rosa
Join Date: Jul 2014
Location: Rio Grande, Brazil
Posts: 8
Rep Power: 12 |
Quote:
Regards. Eduardo |
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October 16, 2014, 06:38 |
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#4 | |
New Member
Ouyang Zailong
Join Date: Apr 2014
Posts: 5
Rep Power: 12 |
Quote:
I have adopted QMOM method for PBM solution, and from the postprocessing, some unexpected results were acquired. Reasons account for that situation i guess show as follows: first, values of the gas inlet boundary initial moments may set incorrectly(i set these values based on the volume fraction(0.03) of gas phase and bubble mean size(0.003m), such as, m3 = 0.03, m2 = 10, m1= 3333, ... ); secondly, the sequence of caculation: 1, single phase flow field; 2, coupling PBM. however, i am not sure it is correct or not. thirdly, models for breakage and aggregation are crucial for the results. -------------------------------------------------------------------- i hope we can discuss and learn about PBM together! Best regards. waouyouy |
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October 16, 2014, 14:35 |
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#5 | |
New Member
Eduardo da Rosa
Join Date: Jul 2014
Location: Rio Grande, Brazil
Posts: 8
Rep Power: 12 |
Quote:
Are you using granular theory to characterize the bubbles? |
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October 17, 2014, 10:03 |
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#6 | |
New Member
Ouyang Zailong
Join Date: Apr 2014
Posts: 5
Rep Power: 12 |
Quote:
in addition, do you think the initial moments i defined above on gas inlet are correct? |
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October 17, 2014, 10:35 |
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#7 |
New Member
Eduardo da Rosa
Join Date: Jul 2014
Location: Rio Grande, Brazil
Posts: 8
Rep Power: 12 |
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October 18, 2014, 08:02 |
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#8 | |
New Member
Ouyang Zailong
Join Date: Apr 2014
Posts: 5
Rep Power: 12 |
Quote:
i use the steady state for simulation, and with the calculation going on, more and more bubbles are reach the max size which set in the pop model; at last, this situation will be spread to the whole tank.(see the pictures attached) 100_steps.png 300_steps.jpg 900_steps.png apparently, this is nonphysical, but still i can not find the solution. so do you have some suggestions? |
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October 23, 2014, 14:13 |
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#9 | |
New Member
Eduardo da Rosa
Join Date: Jul 2014
Location: Rio Grande, Brazil
Posts: 8
Rep Power: 12 |
Quote:
Best regards. |
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October 25, 2014, 03:19 |
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#10 | |
New Member
Ouyang Zailong
Join Date: Apr 2014
Posts: 5
Rep Power: 12 |
Quote:
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February 23, 2015, 03:09 |
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#11 |
New Member
hyunkwonlee
Join Date: Feb 2015
Posts: 3
Rep Power: 11 |
Hi, waouyouy.
Did you use 4 moments instead of 6 moments? Can you explain why do you use it? and the values,(m3,.....m0), are initial conditions or boundary condition value?? |
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September 17, 2015, 23:05 |
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#12 | |
New Member
Meng Liu
Join Date: Sep 2015
Posts: 14
Rep Power: 11 |
hi, waouyouy:
I am new to DQMOM. And I don't know how to set this model in fluent. Could you send you case to me? my email: nel86@qq.com. Best regards. Quote:
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February 23, 2016, 05:41 |
definition of DQMOM and QMOM
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#13 |
New Member
khaled oualha
Join Date: Feb 2016
Posts: 2
Rep Power: 0 |
Hello everyone, I have a problem with the definition of DQMOM and QMOM. Could you please send me the different step to define this model. thank you.
my email : khaled87walha@gmail.com |
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June 21, 2016, 14:52 |
need help
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#14 | |
New Member
rahgoshafan
Join Date: Jul 2009
Posts: 9
Rep Power: 17 |
Quote:
I need tutorial for step of config and solve Population Balance Model . Thanks for help email is: rahgoshafan@yahoo.com |
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