Fig. 2From: Establishment of a simple method to evaluate mixing times in a plastic bag photobioreactor using image processing based on freeware toolsDetermination of mixing times in the 10 L bubble column at a gas flow rate of 10 L h−1. The mixing times have been evaluated between tracer additions until signal stability of ± 5.0% was reached (evaluated length of mixing time marked with red dots). A Reference method (pH probe). B Optical dye tracing methodBack to article page