Table 2: Range of experimental conditions investigated.

Superficial gas velocity0.0025–0.020ms−1
SDS concentration0–50ppm
Equilibrium surface tension72.0–44.1mN/m
Temperature25 ± 2 °C
Gas holdup in the riser (±4%)0.007–0.14
Gas holdup in the downcomer (±4%)0–0.11
Liquid circulation velocity (±4%)0.57–1.3ms−1
Mixing time (±7%)18–40s
Pressure drop across sparger70–350kPa
Mass Flow rate of water through the sparger0.06kg/s
Gas to liquid mass flow ratio in the sparger0.0021–0.017