Recognition of onset of slug using recurrence analysis of pressure signal

• Recurrence analysis of Pressure signals proposed for identification of the onset of slug. • Distinct recurrence plots are obtained for stratified-wavy flow and slug flow regime. • A dense homogeneous and a grainy homogeneous plot for stratified and wavy flow. • Slug flow regime develops a checkerboard-like recurrence structure. • Recurrence rate, determinism, and entropy show sharp jump in value at the onset of slug. Slug is produced when the...