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Effect of biofilm viscosity increase on biofilm–flow interaction at umax = 0.001 m s−1. Velocity profile and biofilm volumetric fraction Φn over time. (a) Case 1, ηn = 1 kg m−1 s−1. (b) Case 2, ηn = 10 kg m−1 s−1. (c) Case 3, ηn = 102 kg m−1 s−1.
