Interfacial wave characteristics have been studied experimentally in stratified-wavy configuration for air-oil two-phase flow at Tulsa University Fluid Flow Projects (TUFFP) 6-inch low pressure flow loop. Flow rates of each test fluid are adjusted such that the superficial gas and liquid velocities vary between 9.2 m/s ≤ V_(SG) ≤ 15 m/s and 0.01 m/s ≤ V_(SL) ≤ 0.02 m/s, respectively, in horizontal pipe configuration. The time-averaged values of the liquid holdup obtained with the wire-mesh sensor are, in overall, good agreement with the measurements via the quick closing valves. The mean value of the wetter pipe perimeter is found to decrease with increasing v_(SG) at a constant v_(SL). The wave celerity is observed to increase with V_(SG) and v_(SL). Pseudo 3-D visualization of the interface topology and the analyses on the signals reveal wetted pipe perimeter and liquid film height vary out-of-phase with each other. The wave frequency is found to be sensitive to the changes in v_(SG) for v_(SL) = 0.02 m/s.
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