Journal
REVISTA BRASILEIRA DE FRUTICULTURA
Volume 30, Issue 2, Pages 385-389Publisher
SOC BRASILEIRA FRUTICULTURA
DOI: 10.1590/S0100-29452008000200020
Keywords
cupuassu; rheology; shear flow; Arrhenius
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The rheological behavior of the entire cupuassu pulp was determined in the temperature range 10-60 degrees C. The effects of temperature and deformation rate were evaluated by means of shear flow tests. Rheometry analyses were conducted with a Thermo Haake RheoStress 1 system. Rheograms were described by models by Ostwald-of-Waelle and Herschel-Bulkley. The Ostwald-of-Waelle model successfully represented pulp flow behavior. The product presented shear-thinning behavior and the flow behavior index (n) decreased with the increase of temperature. The effect of temperature on the apparent viscosity in cupuassu pulp was described by an Arrhenius equation and discussed in terms of activation energy. The increase in shear rate caused an energy increase, and values were obtained in the range of a line from 1 to 2 kcal/gmol.
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