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August 6, 2012, 03:33 
Help needed in modelling a liquidsolid fluidized bed

#1 
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Jovan
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Hi all,
I am currently working on a University project which requires me to model a liquidsolid fluidized bed, 0.5m in diameter and 3m tall. I have no problems with geometry or meshing but am struggling with the addition of the solid phase. My major problem is how to define the solid phase, i.e. initial bed height and packing. If there is some one to guide me through the process involved in designing this system, it would be greatly appreciated. If anymore information is required, please don't hesitate to ask me. Cheers Last edited by Jovan10; August 6, 2012 at 03:37. Reason: Addition of information 

August 6, 2012, 10:40 

#2  
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Quote:
what kind of code do you use for that ? 

August 6, 2012, 11:03 

#3 
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Jovan
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I am using Ansys CFX for modelling purposes. I have defined volume fractions for the solid and liquid phases. But being a complete novice at CFD modelling, I'm unsure of how to proceed from there.
The main issue is that I haven't been able to model the initial bed height etc. 

August 6, 2012, 12:55 

#4  
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Quote:
You just have to set the initial conditions for these variables. After the program should compute the time and spatial evolution of the volume fractions Quote:
(number of particles,diameter of these particles, geometry of your column... ) 

August 6, 2012, 21:47 

#5 
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Jovan
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Hi leflix,
Thanks for your help. This is how I have defined the volume fractions for the problem: Solid: IniVoFSES = 0.35 #initial volume fraction# SESVoF = IniVoFSES*step((yinitialy)/1[m]) yinitial = 0.25 #initial bed height# Liquid WaterVoF = 1VoFSES Is this the way I am meant to go about defining the initial height of the bed? As I want it to be at 0.25m, also I do not know the number of particles, but the mean diameter of the particles is roughly 100microns. Thanks again. 

August 7, 2012, 06:20 

#6 
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I do not know the specifications of CFX but I guess yes. Apparently it uses a EulerEuler method. You just have to set the height of the bed you want.


August 14, 2012, 12:22 
CFD MODELING IN LS FLUIDIZED BED PROJECT ,particularly in sof

#7  
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kavitha
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Quote:
Thank you 

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fluidised beds, fluidized bed 
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