Mixing viscoplastic fluids in stirred vessels over multiple scales: An experimental and CFD approach
| Autor: | Paul F. Luckham, Lyes Kahouadji, Karan Mirpuri, Patrick M. Piccione, Omar Matar, Andrew Quarmby, Andrew W. Russell, Christos N. Markides |
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| Přispěvatelé: | Engineering and Physical Sciences Research Council, Syngenta, Syngenta Ltd |
| Rok vydání: | 2019 |
| Předmět: |
Flow visualization
Technology Engineering Chemical Materials science General Chemical Engineering SHEAR-THINNING FLUIDS 0904 Chemical Engineering Context (language use) Caverns 02 engineering and technology Computational fluid dynamics Viscoplastic RHEOLOGICAL PROPERTIES POSSESSING YIELD-STRESS Industrial and Manufacturing Engineering Scaling Visualisation Impeller symbols.namesake Engineering 020401 chemical engineering Mixing 0204 chemical engineering LASER-INDUCED FLUORESCENCE Complex fluid CARBOPOL GELS Science & Technology business.industry FLOW VISUALIZATION Applied Mathematics Reynolds number 0914 Resources Engineering and Extractive Metallurgy General Chemistry Mechanics Chemical Engineering 021001 nanoscience & nanotechnology Non-Newtonian fluid Rushton turbine NON-NEWTONIAN FLUIDS CAVERN SIZES symbols Stirred vessel 0210 nano-technology business PSEUDOPLASTIC FLUIDS HERSCHEL-BULKLEY FLUIDS 0913 Mechanical Engineering |
| Popis: | Dye visualisation techniques and CFD are used to characterise the flow of viscoplastic Carbopol™ solutions in stirred vessel systems over multiple scales. Centrally-mounted, geometrically-similar Rushton turbine (RT) impellers are used to agitate various Carbopol 980 (C980) fluids. The dimensionless cavern diameters, Dc/D, are scaled against a combination of dimensionless parameters: Rem−0.3Rey0.6n−0.1ks−1, where Rem, Rey, n and ks are the modified power-law Reynolds number, yield stress Reynolds number, flow behaviour index and impeller geometry constant, respectively. Excellent collapse of the data is demonstrated for the fluids and range of flows investigated. Additional data are collected using a pitched-blade turbine (PBT) with cavern size similarity being shown between the RT and PBT datasets. These results are important in the context of scale-up/scale-down mixing processes in stirred vessels containing complex fluids and can be used to show that flow similarity can be achieved in these systems if the processes are scaled appropriately. |
| Databáze: | OpenAIRE |
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