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Improvement on the distribution uniformity of hydrodynamics in a stirred tank with a novel H-like fractal impeller
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  • Pan You,
  • Xiankun Wu,
  • Yongjun Wu,
  • Hui Li,
  • Peicheng Luo
Pan You
Southeast University

Corresponding Author:220192960@seu.edu.cn

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Xiankun Wu
Yancheng Teachers University
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Yongjun Wu
Southeast University
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Hui Li
Southeast University
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Peicheng Luo
Southeast University
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Abstract

Fractal theory provides a new strategy for the equipment design and industrial amplification. In this work we propose a novel H-like fractal (HLF) impeller to improve the distribution uniformity of hydrodynamics in stirred tanks. The impeller with two vertical blades becomes fractal impellers by designing each vertical blade as an H-shaped sub-blade (HLF-1) or uniform arrangement of H-shaped sub-blades (HLF-2). Flow characteristics including velocity and turbulent kinetic energy (TKE) distributions, vortices, power number, are predicted by large eddy simulation. Compared with Rushton turbine (RT) impeller when H/T=1 (or dual RTs when H/T=1.5, triple RTs when H/T=2), the HLF impeller can produce a flow field with more uniform distributions of larger velocities and TKE level. The HLF-2 impeller can further improve distribution uniformity of hydrodynamics in the case of high H/T. Power analysis shows that this is mainly due to the improved energy utilization efficiency by the fractal structure design.