Abstract
A gas-liquid two-phase flow through vertical sudden contraction pipe is an area that still little is known and has been studied experimentally, visually and numerically. In this study, the flow characteristics of vertical upward gas-liquid two-phase flow through a sudden contraction pipe are examined experimentally and numerically, and a new simple method of flow control to reduce the flow fluctuation and resistance is shown. When mounting a ring-shaped step before the contraction, vortex formation at the contraction was reduced. That is, the flow is suggested by mounting a ring-shaped small obstacle before the contraction to lead to stabilized flow and drag reduction. The effects of Reynolds number, volumetric flow rate ratio of air to water and the ring position were examined. Numerical analysis using an incompressible tow-fluid model was conducted in order to understand the flow pattern well.
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