Determination of the Most Appropriate Rheological Model for Polyethylene Glycols and Fumed Silica Particle Mixtures

Abstract

Shear thickening fluids are smart materials that show a sudden increase in viscosity when exceeding critical shear rates. Different theories have been proposed to explain these properties of shear thickening. The most used of these theories are Order-Disorder Transition and Hydro-Cluster Theory. Due to their reversible properties, shear thickening fluids have been used in many areas. High molecular weight polyethylene glycols showed faster shear thickening fluids behavior. The molecular weight of polyethylene glycol affects many parameters. These parameters are physical bonds, aggregations of molecular, solid particle interactions, and functional groups in the chain. Due to their effect, rheological behaviors of low and high molecular weight polyethylene glycols differ. The mixtures of polyethylene glycols and fumed silica particles show a colloidal distribution. The distribution of fumed silica particle molecules in polyethylene glycol, interaction with each other restriction, and movement of the bulks have affected rheological properties. Physical interactions are manifested in the structure. The mixture showed non-Newtonian behavior in the first and second regions as well. Rheological behaviors of mixtures were compared with experimental data using non-Newtonian models. Power Law, Bingham, Casson, Herschel-Bulkley, and Sisko model equations were used. Silica particle-PEGs mixtures show pseudo plastic in the first region and dilatant fluid behavior in the second region. In the first region, the Power Law model was determined as the most suitable model for experimental data. In the second region, the Herschel-Bulkley model was found to be the most suitable model that was determined by statistical analysis.

A Research on Rheological Behavior of Aqueous Solutions of Pomegranate Peel Powder

“…Since the particles in heterogeneous systems are weakly connected, when subjected to shear stress, the interparticle bonds are broken and less resistance to flow is applied during shear [20]. Non-Newtonian fluids exhibit viscosity that is dependent on the applied shear rate or shear stress [24][25][26][27]. A few common rheological models used to describe non-Newtonian fluids are given in Table 1.…”

Production and characterization of gum exudate from apricot tree: modeling the rheology of the obtained extract

“…Where n is the fluid flow behavior index; μ is the consistency index; and τ 0 is the Bingham and Casson model parameters. The most appropriate model is selected by determining the error functions and correlation coefficients (Yanen et al , 2020a, 2020b; Yanen et al , 2021).…”

“…The most appropriate model is selected by determining the error functions and correlation coefficients (Yanen et al, 2020a(Yanen et al, , 2020bYanen et al, 2021).…”