Two-Phase Flow Characteristics in the Disturbed Flow Region after Mixing Air and Water

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The research presented in this paper concerns the experimental studies of two-phase air-water flow phenomena in the disturbed flow region that exists downstream from an air-water mixer. Experiments were carried out using a horizontal acrylic resin tube of 26.0 mm I.D. and 7.0 m long. The results obtained are summarized as follows : 1. Within the disturbed flow region, there occur drastic changes in the flow configuration and the pressure gradient along the tube. A transition point exists at which the flow pattern at the downstream section is quite different from that at the upstream. 2. The change of pressure gradient mainly results from the momentum change of two-phase mixtures, and so it is closely related to the change of flow configuration. 3. To establish a fully developed flow, a distance equal to 40 to 200 times the diameter from the mixing point may be required. This distance is nearly proportional to the superficial velocity of two-phase mixtures.
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