Influence of temperature on the rheological behavior of whole araca pulp (Psidium cattleianum sabine)

The temperature effect on rheological behavior of whole araca pulp was investigated in this work. The pulp was processed in a depulper with a 1.5 mm screen to obtain a uniform consistency. The rheological measurements were carried out in a concentric cylinder Brookfield rheometer, with a small sample adapter and spindle SC4-27, in a shear rate range of 2.80-70 s(-1). The whole pulp was properly described by the power law model and exhibited a shear thinning behavior. The viscosity decreased with an increase in temperature; however, the viscosity showed a tendency to increase at 60 degrees C. The Arrhenius model gave a good description of temperature effect on apparent viscosity of the pulp, where the activation energy (E-a) determined at a shear rate of 50 s(-1) was 11.03 kJ mol(-1). (C) 2005 Swiss Society of Food Science and Technology. Published by Elsevier Ltd. All rights reserved.