This is the introduction of Orkiszewski Correlation used to predict pressure transverse curve in the pipe. The most important thing about using correlation is good information. The Orskizewski correlation has several steps to determine a lot of figures in multiphase flow calculation. The lack of reliable pressure drop data and experimental flow apparatus for correlation data gathering represent the inherent problems of obtaining a general multiphase flow model.
During multiphase flow in vertical pipe, at least four distinct regimes of flow are identifiable. These are usually described as the bubble, slug, transition, and mist flow regions. The image below demonstrates the geometrical configuration of the four regions of flow. These four flow regimes are important to the Orkiszewski Correlation which will be in details later on.
Bubble flow consists of a continuous liquid phase with little free gas in the liquid medium. When greater amount of gas evolve from the liquid phase, the gas bubbles agglomerate, and form slug-like gas pockets. This characteristic is called the slug flow region. If the greater amounts of gas are released, the transition flow region is formed in which droplets of liquid become entrained in the gas pockets. The gas pockets become distorted and approach a continuous gas form. Greater gas throughput restricts the continuous liquid phase to the well walls with a continuous gas phase flowing within the annular liquid phase. This represents the mist flow region in which the continuous gas phase is saturated with a fine mist of entrained liquid particles. Due to a lot of flow region, it will cause a complexity of the flow the Orkiszewski Correlation which we will fully discuss later.
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