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- W4308597020 abstract "Abstract A comprehensive study of the rheological characterization of the aqueous solutions of polyethylene oxide (PEO) with molecular mass of 4 × 106, 5 × 106, and 8 × 106 g/mol, respectively, named (4 miDA), (5 miDA), and (8 miDA) was conducted. A large batch of samples of 4 miDA PEO with concentrations varying from 0.1% to 3%, representing the range of dilute solutions to very high viscous hydrated gels, were tested. Steady-state shear flow and oscillatory measurements are reported. Cross, Carreau, and Carreau–Yasuda models were used to describe the shear-thinning behavior within the shear rate range (0.001 ≤ γ˙ ≤ 3000 s−1). Experimental findings were validated with published results under the same operating conditions within specified shear rate ranges (0.1 ≤ γ˙ ≤ 100 s−1). We find that the behavior of PEO under shear is highly dependent on the rheometer, material, and operating procedures. Oscillatory measurements were carried out to determine the complex properties of the PEO solutions in the frequency ω and strain amplitude γ ranges of 0.01 ≤ ω ≤ 100 rad/s and 0.01 ≤ γ ≤ 1000%, respectively. Higher magnitudes of dynamic moduli (G/ and G//), zero (η0) and infinite (η∞) shear rate viscosities, resonant frequencies (ωres), linear viscoelastic regions (LVER), and higher relaxation time constants (λ) were observed with increasing concentration and molecular weight. The rheological response of the PEO polymeric solutions was further clarified via Lissajous curves. The aim of this work is to characterize the behavior of the 4 miDA PEO prior to its use in an experimental investigation of the secondary flows of viscoelastic fluids in noncircular channels." @default.
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- W4308597020 date "2022-11-23" @default.
- W4308597020 modified "2023-10-18" @default.
- W4308597020 title "Rheological Characterization of High-Molecular-Weight Polyethylene Oxide—An Extensive Parametric Experimental Study" @default.
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- W4308597020 doi "https://doi.org/10.1115/1.4056160" @default.
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