Applied Rheology: Publications
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Diego B. Genovese, M.A. Rao
Apparent Viscosity and First Normal Stress of Starch Dispersions: Role of Continuous and Dispersed Phases, and Prediction with the Goddard-Miller Model

Appl. Rheol. 13:4 (2003) 183-190

Abstract: Apparent viscosity, ha, and first normal stress coefficient, y1, of six different concentrations of cross-linked waxy maize (CWM), 3.5-5 % w/w, and tapioca, 2.8-4 % w/w, starch dispersions (SDs) showed power law relationships with shear rate, g·, and increased with starch concentration. In both ha and y1, volume fraction of the granules, f, played a more important role than the amylose content of the continuous phase. Slope of ha - g· curves increased mildly with starch concentration, while slope of y1 - g· curves was almost the same for CWM at all concentrations and 4 % tapioca SDs. Values of ha and y1 predicted from dynamic rheological and apparent viscosity data based on the Goddard-Miller model were in reasonable agreement with experimental values. © 2003 Applied Rheology.

DOI 10.3933/ApplRheol-13-183

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Appl Rheol 13 (2003) issues:

           


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