Abstract
Simultaneous applications of particle image velocimetry and planar laser-induced fluorescence in a refractive index matched facility are used to visualize the phase distribution and measure velocity in an immiscible low Reynolds number buoyant oil jet injected into water. Initially, mixing involves entrainment of water ligaments inward and oil ligaments outward, followed by phase fragmentation into blobs and then droplets. Phase-based conditioning reveals spatially varying discrepancies between the velocity and all Reynolds stress components in the oil and water phases. Trends are attributed to intermittency and differences in turbulence production rate.
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