| Summary: | Oil enters a horizontal rotating tube through a radially-attached duct at one end. The tube
with the other end closed is attached with radial twin exit branches permitting oil to exit into
open air. Air begins to enter through one of the two branches into the tube when its rotational
speed reaches certain critical values. An experimental study is performed to investigate this
air-oil two-phase flow behavior. Both the tube and the branches are transparent to allow
illumination and flow visualization during spin-up and spin-down processes. The branch-totube
diameter ratio, rotational speed, and oil flow rate are varied. Changes in oil flow rates
are measured as a function of rotational speed. A comparison is made between cases of a
varying total oil flow rate due to rotation effects and a constant one under control. It is
disclosed that cavitation in oil flow is induced by air entering the branches opposite to the
ejecting oil flow. Subsequently air bubbles progress in the tube. The origin of this intrusion
depends on the hydraulic head loss of the piping system. This study can be applied to oil
lubrication analysis of rotating machinery, such as automotive transmission lines.
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