Year: 2026 | Month: June | Volume 16 | Issue 1
Rheological Characterization and Comparative Evaluation of Herschel Bulkley model, Power law model, and Bingham plastic model for Arrowroot Starch Dispersions
Akshada Shivaji Vekhande and Shrikant Baslingappa Swami*
DOI:June
Abstract:
Rheological Characterization and Comparative Evaluation of different rheological models in describing the flow Properties of gelatinized arrowroot (Maranta arundinacea L.) starch dispersions prepared at concentrations of 5%, 10%, 15%, 20% and 25% (w/v). Flow measurements were conducted over a shear rate range of 0.08, 0.16, 0.4, 0.66, 1.06, 1.6, 2.66, 3.2, 5.33, 8, 13.33, 16, 26.66 and the experimental data were fitted to the Herschel Bulkley model, Power law model, and Bingham plastic model to evaluate their predictive performance. All dispersions exhibited non-Newtonian, shear-thinning nature, with flow behaviour index (n) values ranging from approximately 0.41 to 0.946, depending on concentration. A progressive increase in consistency coefficient (K) (0.156 to 8.3 Pa·sⁿ) and yield stress (τ₀) (1.278 to 5.357 Pa) was observed with increasing starch concentration, indicating enhanced structural interactions within the system. Comparative model analysis showed that the Herschel Bulkley model provided the best fit, with higher coefficients of determination (R²) (0.98-1.00) and lower error values (MSE) (0.09-1.48), along with more uniform residual distribution. The Power law model demonstrated acceptable fitting at intermediate shear rates (R²) (0.96-0.998) but failed to capture low-shear deviations, while the Bingham plastic model showed comparatively poorer performance with higher error values (MSE up to ~20). However, the Herschel Bulkley model is the most appropriate for representing the complex rheological behaviour of arrowroot starch dispersions, particularly in systems exhibiting yield stress and concentration dependent structural characteristics.
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