Experimental studies were carried out to clarify the flow characteristics of liquid films of an annular two-phase flow in a curved double tube;visual observations of liquid film and measurements of film flow rate. Based on these experiments, mechanisms of the formation of annular liquid film in a curved double tube were discussed as follows. The liquid phase moves toward the outside region by the disturbance wave and returns toward the inside region by the base liquid film. The driving force of the former is the centrifugal force acting on the disturbance wave, while the driving force for the latter is the shear force caused by a secondary flow in the gas core.
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