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Simultaneous Particle Image Velocimetry (PIV) measurements of stratifiedturbulent air/water flow in a horizontal pipe have been performed using waterdroplets as tracers in the gas-phase. The use of water droplets as tracersensures that the water surface tension remains unaffected and thus allowssmall-scale interfacial structures, such as capillary waves to occur naturally.Experiments have been conducted in a 31 m long, 100 mm diameter PVC pipe usingair and water as test fluids. For the purpose of validation of the experimentalset-up and the suggested seeding technique, single-phase measurements of bothair and water were compared to each other and to DNS results from literature,showing very good agreement. The two-phase measurements are presented in termsof mean- and rms-profiles. These measurements offer a qualitative demonstrationof the behavior of the interfacial turbulence and its correlation with thevarious interfacial flow patterns. The observations made in this paper are inagreement with the conclusions drawn from the DNS study of Lakehal et al.(2003). The present results may eventually provide a better explanation to manyimportant phenomena related to the physical characteristics of stratifiedtwo-phase flow such as scalar mixing between phases, and to challenges relatedto its modeling.

PIV in stratified gas-liquid flow in a horizontal pipe using water droplets as tracers in the gas-phase