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Old   July 26, 2003, 03:39
Default Perforated plate
  #1
Alex K.
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Hi everybody, I define a perforated plate as porous-jump. 20% of the area of the plate is perforated. What value should i put for the permeability (in the boundary conditions)? CAn i find this value if i know that there are 20% perforations in the plate? Thank you.
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Old   July 26, 2003, 11:32
Default Re: Perforated plate
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Guess
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You may refer to Perry - Chemical engineering Hand Book or You can do series of simulations to find the resistance of the perforated plate!
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Old   July 28, 2003, 08:03
Default Re: Perforated plate
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Erwin
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The permeability factor should be used only whenever the viscous resistance is important (i.e. laminar flow), so forget about using if for a perforated plate. The Fluent help file (6.19.6) shows you how to set the inertial factor for perforated plate, with an example for 25% opena area. Based on this method your value would be 12.5.
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Old   July 28, 2003, 09:34
Default Re: Perforated plate
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Alex K.
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thank you Erwin, this indormation was very important for me. Thnx again.
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Old   July 29, 2003, 05:55
Default Re: Perforated plate
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Erwin
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You're welcome. Don't forget that the value I gave you applies for a perforated plate of 1 mm thickness.
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Old   August 2, 2003, 07:01
Default Re: Perforated plate
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Frank
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Porous jump instead of perforated plate is ok, if the flow comes normal to the plate. If it is under an angle, we found the results look not realistic.
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Old   August 2, 2003, 09:06
Default Re: Perforated plate
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Kostas
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Thank you Frank for sharing your experience with me. I tried to use the perforated plate (as porous jump) and i noticed a small deflection of the direction of the flow. According to my supervisor the result was satisfactory but not very realistic. Thank you very much.
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