Heel estimate during pressure-driven drainage of gels from tanks
| Autor: | Andrei Potanin, Nina C. Shapley |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Shear thinning
Materials science Rheometry Applied Mathematics General Chemical Engineering Rheometer Flow (psychology) Carreau fluid Fluid mechanics 02 engineering and technology General Chemistry Mechanics 021001 nanoscience & nanotechnology Industrial and Manufacturing Engineering Viscoelasticity 020401 chemical engineering Rheology 0204 chemical engineering 0210 nano-technology |
| Zdroj: | Chemical Engineering Science. 230:116158 |
| ISSN: | 0009-2509 |
| DOI: | 10.1016/j.ces.2020.116158 |
| Popis: | This paper deals with methods to predict residue (heel) in a tank after drainage of polymer gels from the tank. Gels of various rheological properties were considered in which a thixotrope (Xanthan gum) and a thickener (carboxymethyl cellulose) were combined in various ratios so as to change the gel flow curve from strongly to weakly shear thinning. Computational fluid dynamics allows the conversion of rheological data collected on a rotational rheometer into quantitative prediction of the heel. A complementary method to provide insight into the fluid mechanics of tank draining uses contraction flow visualized by magnetic resonance imaging (MRI). The size of the stagnant zone which develops in such flow may also be used as a predictor of the heel during drainage. CFD modeling utilizing a simplified Carreau model, where viscoelasticity was neglected and fitting parameters were extracted from rheometry, was successful in predicting the heel mass in the gel tank. |
| Databáze: | OpenAIRE |
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