Fig. 7
a Average L/D cycle frequency fav of PBRs with radial height reduced from the inner side and outer side, b pressure drop, ∆P, of the six PBRs, c efficiency of L/D cycle enhancement, η, for the six PBRs. The values in the legends represent incident light intensity (for example, 375 is the case of I0 = 375 μmol m−2 s−1)