THE EFFECTS OF FORCED VIBRATION ON TWO-PHASE FLOW IN A SMALL DIAMETER TUBE

摘要

The effects of forced vibrations on the motion of air-water two-phase mixture were studied in 2.4mm I.D. horizontal tube over rather wide range of flow conditions (about 60 flows for lateral vibration, 4 flows and 1 stagnant mixture for longitudinal vibration). 13 different modes of sinusoidal vibration with l-8mm amplitude and 1-7.7 Hz frequency were exerted on the test tube. Pressure drop, void fraction and flow pattern of the two-phase flow were compared to those of the flow without forced vibration. It was made clear that the lateral vibration exerted on the tube induced a self exciting fluctuation of the pressure drop for a, specific flow condition and longitudinal vibration on the tube promoted the bubble coalescence.