Viscosity modelling of dough in extrusion

Abstract
Effects of moisture level and shear rate on the rheoldgical properties of blends of corn gluten meal (CGM) and soy protein concentrate, were studied. A simple model was used to correlate extrusion dough viscosities as a function of moisture content and shear rate. The consistency index (m) and flow behaviour index (n) of the blends were determined. It is generally accepted that viscosity is a function of product composition. Our results indicated that individual constituent differences (e.g., protein type) also significantly affected viscosity. Pseudoplastic behaviour was observed during extrusion.

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