Experimental Investigation on Effects of Flow Orientation on Interfacial Structure of Air–Water Two-Phase Flow

This study focusses on investigating the effect of flow orientation global and local two-phase parameters under conditions. Flow visualization, pressure measurement, conductivity probe measurements are performed in a test facility made 50.8 mm inner diameter acrylic pipes with measurement. Characteristics regimes interfacial structures, frictional drop prediction vertical upward downward flows compared analyzed. The results show that unique coring phenomenon slug bubbles off-centered noses appear flow. regime transition boundaries shift to lower gas superficial velocities Furthermore, distribution one-dimensional transport void fraction, area concentration, bubble velocity, Sauter-mean diameter, frequency acquired structures. structure its development found be mainly affected by lift force turbulence related interactions. is modeled Lockhart–Martinelli correlation. larger than recommended C value for both proposed.