Measurement of the Component Flows in a Vertical Two-Phase Flow by Making Use of the Pressure Fluctuation : Part 1, Proposal of a Characteristic Number

Abstract

In contrast to the single-phase flow, the gas-liquid two-phase flow is generally accompanied by violent pressure fluctuations. If the fluctuation is found to follow a certain law, the law may be useful in measuring the component flow in the two-phase mixture. From this view point, the pressure fluctuation was analyzed. This paper is the first report on the result of this analysis. A JIS orifice was fitted at the outlet of a vertical 1 inch bore pipe through which the airwater mixture flowed upward. The pressure at a point immediately before the orifice was recorded and analyzed. It was found that the pressure was either larger or smaller than the time-average pressure, and never stayed at the average amount. Therefore the time rate during which the pressure was larger than the average was definitely measurable. This quantity was named the liquid-phase time ratio, and its properties were examined. If the flow rate of each component of the gas-liquid mixture was given, the new quantity was found to have a definite amount.