Rheology of peach dietary fibre suspensions

The flow behaviour of peach (var. Sudanell) dietary fibre (DF) suspensions was determined with a concentric cylinder viscometer at a temperature range of 15-65 degrees C. The behaviour of peach DF suspensions was pseudoplastic and fitted well to the power-law model. The Arrhenius model described the effect of temperature on the apparent viscosity (eta(app)) and the activation energy of flow (E-a) was in the range 5.2-14.3 kJ/mol, depending on the concentration. Changes of eta(app) with concentration in pseudoplastic suspensions fitted well to a power-law model at the used temperature range. In all the cases, the effect of concentration on eta(app) was more pronounced than the effect of temperature; an exponential expression for the combined effect of temperature and concentration on the eta(app) was given. (C) 1999 Elsevier Science Ltd. All rights reserved.