Effect of temperature on the rheology of concentrated fiber suspensions
| Autor: | Daniel J. Klingenberg, Shalaka Burlawar, Thatcher W. Root, C. Tim Scott, Kyle Schlafmann |
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| Rok vydání: | 2019 |
| Předmět: |
Arrhenius equation
Materials science 010304 chemical physics Mechanical Engineering Apparent viscosity Condensed Matter Physics 01 natural sciences Shear rate symbols.namesake Synthetic fiber Rheology Mechanics of Materials 0103 physical sciences symbols General Materials Science Viscose Fiber Composite material 010306 general physics Bingham plastic |
| Zdroj: | Journal of Rheology. 63:677-691 |
| ISSN: | 1520-8516 0148-6055 |
| DOI: | 10.1122/1.5086815 |
| Popis: | The effect of temperature on the apparent rheological properties of concentrated synthetic fiber suspensions was investigated experimentally. Aqueous suspensions of viscose rayon, acrylic, and nylon 6,6 fibers of various fiber concentrations, sizes, and shapes were used. At a fixed shear rate, the apparent viscosity of all the suspensions decreased reversibly with increasing temperature. The steady-state flow behavior is well described by the Bingham fluid model where the yield stress is a decreasing function of temperature and follows an Arrhenius dependence with an activation energy in the range of 2–80 kJ/mol, which is the same order of magnitude as that reported for 20 wt. % fibrous biomass suspensions below 55 °C. The fiber suspensions exhibited a negative plastic viscosity at low temperatures, and as the temperature was increased, the plastic viscosity became less negative. This temperature-dependent rheological behavior is qualitatively similar to that observed for concentrated fibrous biomass suspensions. The fiber suspensions formed heterogeneous networks where the state of aggregation depended on the experimental conditions and thus affected the macroscopic rheology. |
| Databáze: | OpenAIRE |
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