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Thread: Calculating flow rate from air to water

  1. #1
    Associate Engineer
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    Calculating flow rate from air to water

    Hi,

    Im currently looking at a symstem where air is pumped down a pipe and up through a bigger pipe which lifts water from above. Just wondering if there is anyway of calculating what the flow rate would be through the water if i know what the air flow rate it.

    Any help would be appreciated.

    Cheers.

  2. #2
    Technical Fellow jboggs's Avatar
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    I've read your question four times and have no idea what you're asking. A diagram would help.
    The air is "lifting" the water? From above? Huh?

  3. #3
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    Oops I meant lifting water from below.

  4. #4
    Administrator Kelly Bramble's Avatar
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    Quote Originally Posted by miked_27 View Post
    Hi,

    Im currently looking at a symstem where air is pumped down a pipe and up through a bigger pipe which lifts water from above. Just wondering if there is anyway of calculating what the flow rate would be through the water if i know what the air flow rate it.

    Any help would be appreciated.

    Cheers.
    Flow rate will be derived from differential pressure, size of pipes, etc..

    And, yes there is a way to calculate flow in defined fluid systems - - but you have not provided any usable information on what that system is.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

  5. #5
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    Sorry it's a dredging system. Air is pumped down the annulus pipe and flows into the main bore at the bottom and this main bore is filled with water.

  6. #6
    Technical Fellow jboggs's Avatar
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    Upon encountering the water the air forms bubbles and rises to the top surface of the water. How is the air "pushing" the water anywhere? Unless there's enough airflow to overwhelm the water with unmanageable bubble sizes.

    "Just wondering if there is anyway of calculating what the flow rate would be through the water if i know what the air flow rate it." That makes no sense. First you ask us how to calculate the flow rate through the water, then you tell us you know what the air flow rate is. Sorry. Just confused.

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