Flow Stability and Flow Patterns of Gas-Liquid Flow in Vertical Rectified Inverse U Tube
Lu Yuanwei¹,Wang Yueshe¹,Qian Huanqun¹,Zhou Fangde¹,Wang Jian²
(1.School of Energy and Power Engineering,Xi'an Jiaotong Unviersity,Xi'an 710049,China;2.First Production Plant of Henan Oil Field)

Abstract：The fairing rings are built in the inlet and outlet of the vertical parts of inverse U bend respectively in order to restrain the effect of bend on the flow in it. By the numerical calculation of single-phase flow and the experimental results of two-phase flow it is found that the fairing rings can increase the flow stbility of gas-liquid flow. The same results are found by the flow pat-tern distributions of inverse U bend experimentally. It was found that the intermittent flow region (the region of slug flow and churn flow) of upward flow in vertical inverse U bend is smal-ler and the annular region is larger than that in long straight tube.
Keywords：inverse U tube;flow pattern;flow stability