Domo_Kun
Harmless
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Registered: 25-9-2011
Location: Canada
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Fume hood flow model
I am designing a new fume hood and I would like to run virtual tests to get an idea of the flow before actually building it. I would like to use a
finite element modeling software to simulate the flow of air in the hood. I have a CAD model of the hood already, I would just need suggestions of
software with good documentation or tutorials to get me started. I'm a mechanical engineer and I have used Ansys to model heat transfer through solids
before but I never dealt with fluid finite elements.
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Endimion17
International Hazard
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Mood: speeding through time at the rate of 1 second per second
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 Hello, Random.
Would you like to be my friend, too?
Domo_Kun, what level of details are you looking for? 
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Magpie
lab constructor
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Mood: Chemistry: the subtle science.
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This document shows some CFD modeling of a fume hood (p.24). Perhaps if you contacted the authors they could steer you to the proper simulation
package:
http://ateam.lbl.gov/PUBS/cec/Appendix/doc/EE_FumeHoods.pdf
If you do get some nice graphics please post them on this forum. Good luck.
[Edited on 20-11-2011 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
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Domo_Kun
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Thanks for that paper Magpie!
Sure Endimion17, I'll be your friend haha
I'am mostly looking for the ratios of the airflow between the baffles. I have three slots at different heights in my design and I would just like to
know if the flow is distributed efficiently or if all of the air will go through one of the slots. Does this make sense?
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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Yes, I know what you're saying. I built a 4' fume hood and had to guess at that spacing based on designs shown on the Kewaunee website, IIRC.
Quote: Originally posted by Magpie  |
I studied the shapes of several hoods on the internet to learn the salient features. Directing flow seemed most important. The baffles do this via 3
gaps. At the bottom is a 2" gap, in the middle a 1" gap, and at the top the baffle is bent inward at a 70 degree angle. There is a 1.5" gap at the
top that doesn't show in the picture. This bent end extends out past the 8" duct outlet.
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You can see pictures and find other details of my design here:
http://www.sciencemadness.org/talk/viewthread.php?tid=4777
The single most important condition for a successful synthesis is good mixing - Nicodem
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