Fig. 8From: Light/dark cycle enhancement and energy consumption of tubular microalgal photobioreactors with discrete double inclined ribsThe efficiency of L/D cycle enhancement of three types of PBRs with different L*. The incident light intensities are a 375 μmol m−2 s−1, b 800 μmol m−2 s−1 and c 1200 μmol m−2 s−1Back to article page