Flow disturbances induced by an orifice plate in a horizontal air-water flow in the slug regime

Horizontal air-water slug flow disturbed by an orifice plate. Air and water superficial velocities of 0.50 m/s and 0.30 m/s. Orifice’s pressure difference disclosing the pressure fluctuation (at left) and flow visualization of an elongated gas bubble going through the orifice (at right).