Wall effect on the rheology of short-fiber suspensions under shear
| Autor: | Markus Johannes Henricus Bulters, Benke Li, Paul A. M. Steeman, Wei Yu, Ying Guo |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Journal of Rheology. 65:1169-1185 |
| ISSN: | 1520-8516 0148-6055 |
| DOI: | 10.1122/8.0000292 |
| Popis: | The effect of the wall on the fiber orientation distribution plays a central role in many industrial flows, including thin-wall injection molding, 3D printing, and flow in pores. Though the wall-effect region has been visualized experimentally, the nature and thickness of the layer lack understanding and quantitative study. The present work deals with this wall-effect of fiber suspensions over a broad concentration regime, from dilute to concentrated. We seek to quantify the wall-effect region of the fiber suspensions by combining rheology and microscope image analysis methods, which prove to be well consistent with each other. We find that the characteristic thickness of the wall-effect increases with the fiber content and reaches about two times the fiber length for 40 wt. % fiber suspension. The overall distance of wall influence can be as high as 10–50 times the fiber length. This phenomenon cannot be described by the available models with or without consideration of the wall-effect. |
| Databáze: | OpenAIRE |
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