In situ rheological characterisation of wastewater sludge: Comparison of stirred bioreactor and pipe flow configurations

The analysis of experimental data shows that measurements performed with the PF configuration have to be corrected in order to take into account a wall slip phenomenon. A correction model is proposed that shows that slip mechanism is mostly due to wall static depletion at low solid concentrations (12-17 g L−1), then turns to shear induced migration effect at higher solid concentrations (26-38 g L−1).