Scale-Up of Shear Thinning Fluid Mixing in an Unbaffled Stirred Vessel with Eccentrically Located and Modified Impellers
| Autor: | K.P. Sandeep, Nihat Yavuz |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Shear thinning
Materials science General Chemical Engineering media_common.quotation_subject Mixing (process engineering) Industrial chemistry 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Non-Newtonian fluid Impeller 020401 chemical engineering SCALE-UP 0204 chemical engineering Eccentricity (behavior) 0210 nano-technology media_common |
| Zdroj: | International Journal of Chemical Reactor Engineering. 17 |
| ISSN: | 1542-6580 |
| Popis: | Mixing of a shear thinning fluid was scaled-up by maintaining equal Reynolds number (Re), tip speed, and power per volume. A standard 45° four-blade pitch blade turbine (PBT) and a modified version of the same impeller (DF-PBT) which provided simultaneous upward and downward flow were used. The impellers were located eccentrically, and the effects of scale-up were determined. The distribution of a tracer solution to evaluate mixing progress, power consumption, and flow fields were analyzed to compare the three different scale-up rules. The same endpoint of mixing was achieved in all cases of PBT with noticeable differences in flow profiles. Higher power consumption and less time were necessary to complete mixing with equal power per volume compared to that with equal Re and tip speed rules. For DF-PBT, only equal Re rule resulted in values similar to that obtained at the small scale. At a scale-up ratio of 2, the selection of scale-up rule should be based on the time and power requirements of the process. As the effects of scale-up on eccentrically located impellers do not differ significantly from those of concentrically located impellers, impellers which have complex dynamics such as DF-PBT require further studies to understand scale-up effects. |
| Databáze: | OpenAIRE |
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