Fig. 5.

Volume-specific mass transfer coefficient ka for oxygen as a function of the equivalent floc diameter d_ef as a measure of shear stress for DMA in the 100 and 200 L scale compared with a conventional membrane stator. Large floc diameters correspond to low shear stress and small floc diameters to high shear stress. For the DMA, the following configurations are plotted: First, membrane tubing resulting in a surface area of 30 m²/m³ reactor capacity (100 L scale). Second, more membrane tubing wrapped onto bifurcated rotor arms resulting in a volume-specific mass transfer area of 68 m²/m³ (100 L scale) and 60 m²/m³ (200 L scale), respectively. A comprehensive legend of all Figs. 3, 4, 5, and 6 can be found below Fig. 6