Effect of temperature and shear rate in the properties of whole flow cupuassu pulp (Theobroma grandiflorum)

被引：11
|
作者：
Ferreira, Gizvanete Maria [1 ]
De Oliveira Cavalcanti Guimaraes, Maria Jose [2 ]
Antun Maia, Maria Cristina [3 ]
机构：
[1] UFRJ, Escola Quim, Programa Posgrad Tecnol Proc Quim & Bioquim, Rio De Janeiro, Brazil
[2] UFRJ, Escola Quim, Dept Proc Organ, Rio De Janeiro, Brazil
[3] UFRJ, Escola Quim, Dept Engn Bioquim, Rio De Janeiro, Brazil
来源：
REVISTA BRASILEIRA DE FRUTICULTURA | 2008年 / 30卷 / 02期
关键词：
cupuassu; rheology; shear flow; Arrhenius;
D O I：
10.1590/S0100-29452008000200020
中图分类号：
S6 [园艺];
学科分类号：
0902 ;
摘要：
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.
引用
收藏
页码：385 / 389
页数：5
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