Sand velocity and hold-up characteristics are very important in the design and operation of oil-gas-sand multiphase production and pipeline transportation systems, since they have a strong influence on their hydrodynamics. Previous studies typically use time-averaged values to describe sand velocity and holdup in gas-liquid-solid slug flow through pipes. This work investigates the actual dynamic behaviour of the sand in a continuously operating air-watersand slug flow using digital image analysis technique. Our experiments, while confirming that the behaviour of sand particles in gas-liquid-solid three phase intermittent flows is far from being well understood, provide a more detailed and comprehensive database on sand behaviour, which is essential for a better understanding of gas-liquid-solid slug flow during multiphase production and pipeline transportation.

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