Characteristics of Flow Fluctuation in Natural Circulation Air-Lift Pump : 1st Report, Relation between Characteristics of Flow Fluctuation and Flow Rate of Circulating Water

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An experimental investigation was made on the pumping characteristics of an air lift system consisting of an air-water separator and a constant head tank which are connected by a 25.9 mm I.D. U-tube and a water-return tube. This type of natural circulation system presents a signifacant fluctuation of flow; especially in some flow conditions with reduced pressure, there occurs a self-excited flow oscillation. This is attributed to the compressibility of gas in a gas-liquid two-phase mixture and reversion of water flow from the two-phase mixing section to the head tank. Time-averaged flow rate of water increases with the intensity of flow oscillation. The gas flow rate corresponding to the initiation of lifting water is reduced due to the flow oscillation.
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