Rheological Modeling and Mechanisms of Structure Formation in Disperse Systems Based on Organic Binders

Investigating the rheological behavior and mechanisms of structure formation in disperse systems based on organic binders is a critical task for optimizing energy consumption during the production and operation of viscoplastic petroleum products. The objective of this study is to improve the methodology for evaluating the rheological properties of such systems, accounting for their complex internal structure. Based on an extensive dataset obtained from rotational viscometry, a comparative analysis of flow curve approximation accuracy was performed using the Ostwald – de Waele, Shvedov – Bingham, Casson, and Herschel – Bulkley models. It is shown that the application of simplified power-law relationships leads to a substantial overestimation of the yield stress (up to 1000 %) and a misinterpretation of viscous resistance as static structural strength. The effectiveness of the three-parameter Herschel – Bulkley model is substantiated as the most reliable tool for describing the behavior of viscoplastic media (coefficient of determination > 0.99). It is established that the mineral filler acts as a thickening agent without forming a coherent load-bearing framework, even at high concentrations. The percolation mechanism of system reinforcement by cellulose fibers is confirmed, whereby a spatial reinforcing cluster is formed at fiber contents above 2.5 %. The developed empirical model, which describes the yield stress as a cubic function of fiber content and a linear function of polymer content, is recommended for the targeted regulation of the rheological properties of disperse systems. The obtained results ensure the rational use of expensive components and enhance the energy efficiency of production processes and the operational reliability of materials based on organic binders.

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