Influence of impeller geometry and rotational speed on the power and micro-mixing performance of the stirred tank equipped with multiple impeller
In order to systematically investigate the impact of inclined angles and rotational speeds of multiple impeller on the power consumption and micro-mixing performance in a stirred tank,experimental and numerical simulation ap-proaches are employed to investigate the hydrodynamics and micro-mixing process in the stirred tank equipped with different multiple impellers where iodide-iodate parallel competitive reaction system is introduced to evaluate the mi-cro-mixing performance of the fluid flow in the reactor. Meanwhile,correlation between the segregation index (XS) and turbulent characteristic parameters is also obtained. The results show that the numerical model conducted can well predict the power consumption and micro-mixing performance of the stirred tank equipped with different multi-ple impellers. When the inclined angle of the blade is smaller than 30 °,little influence of inclined angle on the micro-mixing performance is observed. However,the micro-mixing performance is significantly decreased with an increase in the inclined angle of the impeller blade when the inclined angle is larger than 45 ° . It is also found that Xs is linearly proportional to log(ε),where ε indicates the turbulent dissipation rate.
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