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Annular Two-Phase Flow in a C-Shaped Bend. Flow of Liquid Drop Entrained in Gas Core.

Following a study of liquid film flow, experimental results are presented on the variation of the liquid drop flow rate along the axis of a bend tube, the profile of the liquid drop flow rate at the bend exit, and the mean diameter and the distribution of liquid drops entrained in the gas core in an air-mixture flowing upward in an annular drop flow regime through a C-shaped bend of 144-mm radius of curvature with a 24-mm-inside-diameter tube lying in a vertical plane. In orer to study the effect of gravity on flow direction, some experiments are also carried out on downward and horizontal flows in the bend, and on a straight horizontal flow. The flow of liquid drops is greatly influenced by the secondary flow caused by centrifugal force within the gas core, and exhibits some notable features as well as liquid film flow.