fins Posted September 4, 2004 Report Share Posted September 4, 2004 By connecting a airpump that pumps 300 litres of air and hour, Am I correct by saying that 300 litres (roughly) of water will be driven through the filter making it a 300 litre per hour filter? thanks Quote Link to comment Share on other sites More sharing options...
Pegasus Posted September 4, 2004 Report Share Posted September 4, 2004 Am I correct by saying that 300 litres (roughly) of water will be driven through the filter making it a 300 litre per hour filter? Nope... you are not correct. Air will only lift a certain amount of water via an airlift tube, and a great percentage of the action in the tube is cavitation caused by the bubbles. The way to find out "roughly" how much water is being lifted is by connecting an elbow or something to the outlet so that a fixed size container can be filled.. like a one litre container. Taking a reading of the time this takes to fill will give you a "guesstimate" of the amount of water your air driven lift is capable of. The length of the tube, plus the diameter, and the amount it is clear of the surface will vary the results. HTH Quote Link to comment Share on other sites More sharing options...
petplanet Posted September 5, 2004 Report Share Posted September 5, 2004 cavitation...try using that word in everyday conversation.... Quote Link to comment Share on other sites More sharing options...
Ira Posted September 5, 2004 Report Share Posted September 5, 2004 I've used it several times in daily conversation. Though, I don't think cavitation is the right word in this case. In relation to pumps, it's pretty common. Quote Link to comment Share on other sites More sharing options...
chimera Posted September 5, 2004 Report Share Posted September 5, 2004 cavitation is a term used in liquids where tiny air bubbles will get trapped in the liquid which cause them to bounce about causing errosion on the pump they are passed through. its a term often used in boating when talking about outboard propellers - often requiring an anti-cavitation plate (i think thats what they're called?!) as cavitation can effect performance. Bill's theory is still correct though Quote Link to comment Share on other sites More sharing options...
Pegasus Posted September 6, 2004 Report Share Posted September 6, 2004 Thanks Chim,... a good explanation, and basically (in boating terms and pumps) it means lots of water disturbance with very little movement of the liquid... in our case.. water. Often with air driven uplifts you can get more water movement by "reducing" the air flow, rather than "increasing" it. Quote Link to comment Share on other sites More sharing options...
Alan Posted September 6, 2004 Report Share Posted September 6, 2004 Apparently you should be able to count the bubbles for maximum efficiency. Alan Quote Link to comment Share on other sites More sharing options...
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