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Autores
Orientador(es)
Resumo(s)
A semi-empirical model to predict the apparent viscosity function of high moisture rice starch melt was developed. The model
coupled the influence of extruder operating parameters on characteristics of the fluid and on conditions of rheological
measurements. The model for apparent viscosity considered power law dependency of shear rate, and exponential dependency of
temperature, moisture content, and screw speed. A MPC/V-30 co-rotating twin-screw extruder and a slit die/torque rheometer
combination were used. Operating parameters varied between 175 and 275 rpm for the screw speed, 80 to 100 °C for extruder
and slit die temperatures, 570 to 650 g/kg solution for moisture content, and 2 to 7 kg/h for the mass flow rate. The fit between
the experimental results and model was good. Die temperature was the most important parameter influencing the viscosity of rice
starch during extrusion.
Descrição
Palavras-chave
Starch Viscosity Twin-screw extrusion Temperature Moisture content Screw speed Mass Flow rate
Contexto Educativo
Citação
AKDOGAN, Hulya ; TOMÁS, Rui L. ; OLIVEIRA, Jorge C. - Rheological Properties of Rice Starch at High Moisture Contents during Twin-screw Extrusion. Lebensmittel-Wissenschaft und-Technologie. ISSN 0023-6438. 30:5 (1997) 488-496
Editora
Academic Press Limited