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Thread: DIY floating skimmer using airlift (help needed).

  1. #11
    Tategoi
    Join Date
    Feb 2010
    Location
    Georgia
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    321
    So how did this go?

  2. #12
    Nisai
    Join Date
    Aug 2010
    Location
    Finland
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    56
    Quote Originally Posted by chang26k View Post
    So how did this go?

    Not well so far.... Because of the air the entire thing has to be heavy but at the same time float without rising once the airlift starts. I will try again once the snow melts here.

  3. #13
    Tategoi
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    Jul 2005
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    Fremont, CA
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    367
    Quote Originally Posted by Razoola View Post
    Not well so far.... Because of the air the entire thing has to be heavy but at the same time float without rising once the airlift starts. I will try again once the snow melts here.
    The airstone was blocking the pipe, reducing the cross sectional area of the pipe. Size of bubbles or ring injection has nothing to do with lift and most just inject the air thru a barbed fitting or simply running the tubing down (or up) the pipe.

    You will get the best efficiency by injecting air in excess of 25% of the water’s volume in the lift. Around this point bubbles form that are large enough to near plug flow (still operating on ratio of weight differential of lifted water:supply water.) wall friction creates vortexes that pull off very small bubbles that reduce the friction of the pipe walls. Maximum efficiency will be at 80% submergence while maximum flow will be at 100% (at the water surface) submergence.

    If you’re into technical stuff, a great source of information is Recirculating Aquature by Timmons and Ebeling. The text is available from commercial sources for around $185Dr. At the time, Dr. Ebeling was selling them for $124 ea., but I picked a box of them up (5 or 6 volumes) for $75 each from Dr Ebeling (504) 837-5575 because they didn’t have to be repackaged and only required a single order to be generated, rather than 5 or 6.

    Rich

  4. #14
    Tategoi
    Join Date
    Feb 2010
    Location
    Georgia
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    If 100% gets you maximum water flow, why is 80% most efficient?

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