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| Building a Fume Hood |
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| S. Heslop:
I got a little too excited with the last post. I was thrilled I'd gotten something to work. Made some other programs for bounding boxes and the like and spent most of today trying to get to grips with After Effects. Still haven't got an effect i'm too happy with. I also spent a bit of time thinking about the hood proper. I'm wondering how well this sort of arrangement would work as a venturi. I believe for a venturi to work well there needs to be a bit of a restriction and then the inlet just ahead of it. If I get some time i'll have a go at building it tomorrow, but i'd appreciate any opinions on if this'll work or not. |
| Manxmodder:
Simon, that probably will give you the negative pressure you need for the extraction to take place,however you will probably need a bit of experimentation with the leading ramp and certainly watch out for vortices caused by sharp edges causing abrupt changes of airflow. The sharp corner you show on your lead ramp may actually cause some downdraught on the reverse side thus reducing your extraction flow rate. Maybe a slower and longer rate of ramp angle on the leading face will also help improve the efficiency.......OZ |
| Will_D:
When checking a fume hood a cigarette is your only friend! Just don't smoke it!! |
| S. Heslop:
I built it and gave it a test but the results are pretty disappointing. I played around with it for a bit trying to get a better airflow but didn't get anything too impressive. So in all honesty I feel like the blower by itself produces about the airflow that I want. I really wasn't sure what sort of performance i'd get out of this venturi but I think even under ideal circumstances it won't ever be enough. So my options are to either mount this blower directly in the fume path or go to back to the bouncy castle blower. I think the blower Rob gave me is really nice though, and I might have a use for it elsewhere. So it'd be a shame to potentially wreck it with a bunch of corrosive fumes. |
| S. Heslop:
Still fussing with this corny slideshow effect. Not 100% on it but it's starting to look more like what i'm after. Each new effect layer really messes with the brightness and colours and it's a juggling act with various level adjustment layers to try keep the colours sane. There's more tweaking to go. It's tempting to add other stuff like the image warping, but it's already headache inducing enough. The nice part though is that it's fairly quick to make the animation underneath it all, and once the effect is final I won't ever have to make it again. |
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