Abstract
This study investigates the effects of oil viscosity, pipe diameter, and pipe inclination angle on drift velocity. Experiments were conducted for medium viscosity oils using a 0.0508-m ID pipe for inclination angles between 0° and 90°. In these experiments, it was observed that as the liquid viscosity increased, the drift velocity decreased. Drift velocity displayed a convex parabolic behavior with respect to the inclination angle. For all liquid viscosities, a maximum velocity value was observed between 30° and 50° inclinations from horizontal. A unified dimensionless closure relationship for drift velocity is proposed. It was developed using data acquired in this study and available data from literature with a pipe diameter range of 0.0373–0.178 m.
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