Study of the Influence of Horizontal Oil-Water Two-Phase Flow Pattern on the Impedance Moisture Meter
水平油水两相流流型对阻抗式含水率计的影响研究

The influence of horizontal oil-water two-phase flow pattern on the measurement of impedance moisture meter was exprementially studied in a 20mm diameter acrylic pipe. Resistivity of oil-water mixture was measured by impedance moisture meter first under condition of different moisture contents and flow rates, and the corresponding flow patterns were recorded by a high-speed camera to analyze the influence of flow patterns on the measurement. It is demonstrated that at low flow rate (stratified flow), the remarkable velocity slip between oil and water plays a dominant influence on mixture resistivity. This phenomenon can be explained by two-fluid dynamic model. While at the high flow rate (dispered flow), the slippage between oil and water can be ignored. The mixture resistivity mostly depends on the mixture spatial structure. Then Maxwell electric model was adopted to calcualte the water cut. Above result is approaching to the known results calculated by the single phase flow rate before mixed.