The main aim of this work is to investigate the effect of vertical to horizontal 90° bends on the structure and the frequency of the flow. The paper describes how the flow structures in the vertical section develop as it moves downstream the mixing section. It also highlights the effect of centrifugal force on slugs passing around the bend. Finally the flow development downstream the bend and how it alters as it goes around the bend predominantly forming stratified and slug flow is discussed.
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