# Fluid mixing problem in bubble column

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 April 16, 2013, 11:45 Fluid mixing problem in bubble column #1 New Member   Sithara Join Date: Apr 2013 Posts: 2 Rep Power: 0 Hi, I'm a beginner to fluent and currently working on a project to simulate flow patterns in a bio gas reactor. Mixing in the tank is achieved by bubbling of air through 10 pipes arranged in a circular pattern. My main problem was with the large dimensions of the tank (H = 20m, D = 9.5 m) and compared to the pipes ( D= 7.5 cm) which gave me around 1 million CVs. Here are some of the operating conditions. pressure at top of the liquid level = 40 m bar pipe introduces air at a pressure of 2 bar and air velocity around 2 m/s. I've used velocity inlet and pressure outlet BCs and bit confused about which values to be used at boundaries. I've used for operating pressure= 0, gauge pressure at pressure outlet = 1 atm+40 mbar and initial guage pressure at velocity inlet = 2 bar. But the static pressure profile i got was not seems OK...!!! And it take lot of iterations to converge at transient state..!!! Can anybody give me some feedback to get through with this problem?? Thanks in advance /SITD

 June 30, 2013, 18:44 #2 New Member   Hossein Join Date: Oct 2010 Location: Greensboro, NC, USA Posts: 29 Rep Power: 8 for gas, I suggest you use mass-flow-inlet and out flow when you have the pressure, the use pressure inlet for inlet, and pressure outlet for the top with this size of reactor, I'm not sure if 1 million meshes are enough! try to use a smaller one first __________________ Hossein Amini PhD student in Biochemical Engineering; Computational Science and Engineering department; North Carolina Agricultural and Technical State University

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