A study on over-reading model for gas-liquid flow based on vertical Venturi

Abstract

The accurate measurement of gas-liquid flow has great significance in industrial production, especially for natural gas. Venturi is a kind of differential pressure flowmeter which is widely used in gas-liquid flow measurement and the differential pressure would be higher in the gas-liquid flow than the gas alone due to the existence of the liquid. This phenomenon is termed as overreading(OR). In this paper, a modified model based on De Leeuw OR model has been proposed. Most studies of OR (including De Leeuw’s) were based on the horizontally mounted flowmeters, however this model was modified for the vertically mounted Venturi. The experiment was carried out with a low range of pressure (0.6-1.2 MPa)and relatively wider range of liquid content (compared to wet gas XLM < 0.3, this experiment XLM = 0.04 − 1.14). The relative error of OR predicted by the modified model was within 5% at the confidence level of 90%. According to the data analysis, this modified model could be a better choice for vertically mounted Venturi than the existing OR models.