Controlled stress rheological measurement of blackgram flour dispersions

The controlled stress measurement of the rheology of blackgram flour dispersions at different solid concentrations (5-30%) was conducted employing a coaxial cylinder attachment. The dispersions behaved like shear-thinning fluids with flow behaviour indices (0.91-0.44) decreasing with an increase in solid concentration. The experimental yield stresses were between 115 and 2375 mPa and ;obeyed the Herschel-Bulkley model as judged by low values (less than or equal to 1.4%) of root mean square between the experimental and predicted values. An increase in solid concentration increased the yield stress, consistency index and apparent viscosity of these dispersions. Time-dependency was observed with these dispersions and showed thixotropic behaviour. (C) 2003 Elsevier Ltd. All rights reserved.