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Offlinepetridish
gutted mycophile

Registered: 02/23/07
Posts: 47
Last seen: 11 years, 8 months
Testing laminar flow.
    #7744359 - 12/11/07 09:52 AM (16 years, 1 month ago)

How does one go about testing they're hood to see if the flow is indeed laminar?


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Invisibleohmatic
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Registered: 02/28/04
Posts: 6,742
Loc: europe
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Re: Testing laminar flow. [Re: petridish]
    #7744373 - 12/11/07 09:55 AM (16 years, 1 month ago)

Quote:

petridish said:
How does one go about testing they're hood to see if the flow is indeed laminar?




Quote:

candle will tell you if it pushes adequate air through the filter.
If it can bend the flame over, it's okay.
If not, it's bunko.
If it blows a candle out, wired direct.
Then, you will need a speed control, to slow it down.
As RR points out,
do not use a rheostat, in place of a motor speed control.






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Offlinepetridish
gutted mycophile

Registered: 02/23/07
Posts: 47
Last seen: 11 years, 8 months
Re: Testing laminar flow. [Re: ohmatic]
    #7744407 - 12/11/07 10:12 AM (16 years, 1 month ago)

I'm not so much asking how to test speed. I have a $40 fan speed control ala RR that allows me to dial in speed with the help of my bic.


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OfflineRogerRabbitM
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Registered: 03/26/03
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Re: Testing laminar flow. [Re: petridish]
    #7744863 - 12/11/07 12:37 PM (16 years, 1 month ago)

Start by holding a candle or lighter in front of the hood, and move it all through the workspace. It should stay bent the same amount, no matter where you put it. If it blows harder in the center than at the edges, the center air is moving faster, thus you wouldn't have laminar flow.

A more in depth test could be done by placing a bottle or other cylinder shaped object in the flow and then holding a stick of incense in front of it, and then watch the smoke as it curls around the bottle. If the smoke smoothly wraps around the bottle, it indicates laminar flow. If it swirls off and forms eddys or other turbulence, you don't.
RR


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Offlinepetridish
gutted mycophile

Registered: 02/23/07
Posts: 47
Last seen: 11 years, 8 months
Re: Testing laminar flow. [Re: RogerRabbit]
    #7744943 - 12/11/07 12:58 PM (16 years, 1 month ago)

Elegant in it's simplicity. The best answers usually are the simple ones. Thank you. I will test this with smoke the next time I get it out.


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