Simulation Analysis of Power Consumption and Mixing Time of Pseudoplastic Non-Newtonian Fluids with a Propeller Agitator

Shiji Wang, Peng Wang, Jianping Yuan, Jinfeng Liu, Qiaorui Si and Dun Li
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Shiji Wang: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Peng Wang: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Jianping Yuan: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Jinfeng Liu: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Qiaorui Si: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Dun Li: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China

Energies, 2022, vol. 15, issue 13, 1-24

Abstract: In order to study the effect of a high twist rate propeller on the flow field characteristics of pseudoplastic non-Newtonian fluids, the numerical simulation method was used to analyze the mixing flow field of pseudoplastic non-Newtonian fluids at different concentrations in this paper. By changing the rotational speed and the blade installation height, the vorticity, turbulent energy, mixing power consumption, mixing time and mixing energy of the flow field were analyzed. By analyzing and comparing the research results, it was found that increasing the mixing propeller speed can effectively improve the mixing effect. Single-layer arrangement of mixing propeller is not suitable to be placed close to the bottom of the tank, and the mixing of the upper flow field is weaker. Under the same conditions, when the viscosity of pseudoplastic non-Newtonian fluid is increased, the high vorticity and high turbulence energy area is reduced to the mixing propeller area, and the time required for mixing 1.25% CMC solution is 246 times longer than that for mixing 0.62% CMC solution and the required mixing energy also increases sharply. The accuracy of the numerical simulation was verified by experiments. Considering the mixing effect and the mixing power consumption, the single-layer arrangement propeller is more suitable for mixing pseudoplastic non-Newtonian fluids with mass fraction of 0.62% CMC or below. This study can provide a reference for the practical application of propeller mixers to mix pseudoplastic non-Newtonian fluids.

Keywords: mixing; pseudoplastic non-Newtonian fluids; propeller; computational fluid dynamics (CFD) (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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