Hydrodynamics performance of Newtonian and shear-thinning fluids in a tank stirred with a high shear impeller: Effect of liquid height and off-bottom clearance

Ramírez-Muńoz, J.; Márquez-Baños, V.E.; Alvarez-Vega, J.; Mompremier, R.; Núñez, J. Gómez; Guadarrama-Pérez, R.

doi:10.1016/j.cherd.2023.02.021

Cited by 2 publications

(1 citation statement)

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“…Depending on the final objectives and whether the mixing process is limited by shear (e.g., dispersion of pigment particles, bubbles and droplets) or pumping (e.g., blending of miscible liquids, heat transfer or solid suspensions), as well as the working fluid viscosity, the mixing process in stirred tanks will be optimally performed in the laminar, transitional or turbulent regime. For instance, for pigment dispersion, as TiO 2 , into water for the elaboration of slurries, the utilization of high-shear impellers operating at Re in the laminar regime at relatively high speeds, exhibits a superior performance compared to transitional and turbulent regimes [10,11]. On the other hand, mixing efficiency in processes limited by pumping with conventional impellers (e.g., Rushton, pitched blade or high efficiency) is more effective in the turbulent regime [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Novel Experimental Apparatus for Characterizing Flow Regime in Mechanically Stirred Tanks through Force Sensors

Magos-Rivera,

Avilés-Cruz,

Ramírez-Muñoz

2024

Sensors

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Pressure fluctuations in a mixing tank can provide valuable information about the existing flow regime within the tank, which in turn influences the degree of mixing that can be achieved. In the present work, we propose a prototype for identifying the flow regime in mechanically stirred tanks equipped with four vertical baffles through the characterization of pressure fluctuations. Our innovative proposal is based on force sensors strategically placed in the baffles of the mixing tank. The signals coming from the sensors are transmitted to an electronic module based on an Arduino UNO development board. In the electronic module, the pressure signals are conditioned, amplified and sent via Bluetooth to a computer. In the computer, the signals can be plotted or stored in an Excel file. In addition, the proposed system includes a moving average filtering and a hierarchical bottom-up clustering analysis that can determine the real-time flow regime (i.e., the Reynolds number, Re) in which the tank was operated during the mixing process. Finally, to demonstrate the versatility of the proposed prototype, experiments were conducted to identify the Reynolds number for different flow regimes (static, laminar, transition and turbulent), i.e., 0≤Re≤ 42,955. Obtained results were in agreement with the prevailing consensus on the onset and developed from different flow regimes in mechanically stirred tanks.

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Section: Introductionmentioning

confidence: 99%