Effect of Contaminants on the Gas Holdup and Mixing in Internal Airlift Reactors Equipped with Microbubble Generator

Table 2

Range of experimental conditions investigated.

Superficial gas velocity	0.0025–0.020	ms^−1
SDS concentration	0–50	ppm
Equilibrium surface tension	72.0–44.1	mN/m
Temperature	25 ± 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%)	0.57–1.3	ms^−1
Mixing time (±7%)	18–40	s
Pressure drop across sparger	70–350	kPa
Mass Flow rate of water through the sparger	0.06	kg/s
Gas to liquid mass flow ratio in the sparger	0.0021–0.017	—