The Planted Tank Forum - View Single Post - Simple DIY Drop Checker (V2 is Alive! 3/31)
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post #35 of (permalink) Old 04-08-2011, 07:59 PM
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Join Date: Dec 2005
Location: Sacramento, CA
Posts: 20,304
You can experiment with different geometries of drop checkers and if you do you quickly learn that the fastest response time comes from high area of tank water to air bubble surface, low air bubble volume, high area of air bubble to indicator fluid surface, and low volume of indicator fluid. A flared opening like a funnel, does reduce the response time considerably. The biggest effect is having a large surface area to volume ratio for the indicator fluid - a shallow dish of fluid as opposed to a tube of fluid. Reynold's number isn't involved at all. The speed of movement of the dissolved CO2 in water is very high in any case, so much so that it has little effect - you can assume that the CO2 concentration changes instantaneously at any local spot in the tank whenCO2 is added. (It doesn't, but compared to one hour response times, it might as well be instantaneously.)

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