The Application of Digital Image Processing to Study Slug Flow Characteristics in A Horizontal Pipe

摘要

Several flow measurement methods have been developed to get more in depth information oftwo-phase flow. Digital image processing technique is one of the methods which provide manyadvantages. It is classified as non-intrusive methods and able to process a large number of images.Furthermore, this technique is also supported by the flexible algorithm and advanced technology in highspeed camera. In slug flow, the presence of small bubble become one of the biggest challenges since it candistract slug interface. This work explains image processing procedures to get clear interface between thegas and liquid phase on horizontal slug flow. Then the image processing technique was applied to a set ofslug flow data. The experiment was conducted in a horizontal pipeline with 50 mm inner diameter usingthe combination of superficial liquid velocity 0.2- 0.77 m/s and superficial gas velocity 0.7 – 1.88 m/s. Theflow was recorded using high speed video camera and extracted into images sequence. Next, appliedalgorithm is well explained and the example of image processing result is presented. When the interface isclear, some slug flow parameter can be calculated like its velocity, length, and frequency. This method isable to reveal the effect of liquid superficial velocity and gas superficial velocity on slug flow parameter.Moreover, present data is also compared with previous research and shows good agreement.