Population Balance Modeling (DQMOM setup)
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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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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Regards. Eduardo |
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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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Are you using granular theory to characterize the bubbles? |
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in addition, do you think the initial moments i defined above on gas inlet are correct? |
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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) Attachment 34446 Attachment 34447 Attachment 34448 apparently, this is nonphysical, but still i can not find the solution. so do you have some suggestions? |
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Best regards. |
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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?? |
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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definition of DQMOM and QMOM
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 |
need help
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I need tutorial for step of config and solve Population Balance Model . Thanks for help email is: rahgoshafan@yahoo.com |
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