Reactive mixing performance for a nanoparticle precipitation in a swirling vortex flow reactor

Liu，Lu1,2; Yang，Xiaogang3; Guo，Yanqing3; Li，Bin3; Wang，Lian Ping1,2

2023-03-01

10.1016/j.ultsonch.2023.106332

ULTRASONICS SONOCHEMISTRY   Impact Factor & Quartile

1350-4177

1873-2828

Mixing performance for a consecutive competing reaction system has been investigated in a swirling vortex flow reactor (SVFR). The direct quadrature method of moments combined with the interaction by exchange with the mean (DQMOM-IEM) method was employed to model such reacting flows. This type of reactors is able to generate a strong swirling flow with a great shear gradient in the radial direction. Firstly, mixing at both macroscale and microscale was assessed by mean mixture fraction and its variance, respectively. It is found that macromixing can be rapidly achieved throughout the whole reactor chamber due to its swirling feature. However, micromixing estimated by Bachelor length scale is sensitive to turbulence. Moreover, the additional introduction of ultrasound irradiation can significantly improve the mixing uniformity, namely, free of any stagnant zone presented in the reactor chamber on a macroscale, and little variance deviating from the mean environment value can be observed on a microscale. Secondly, reaction progress variable and the reactant conversion serve as indicators for the occurrence of side reaction. It is found that strong turbulence and a relatively fast micromixing process compared to chemical reaction can greatly reduce the presence of by-product, which will then provide homogenous environment for particle precipitation. Moreover, due to the generation of cavitation bubbles and their subsequent collapse, ultrasound irradiation can further intensify turbulence, creating rather even environment for chemical reactions. Low conversion rate was observed and little by-products were generated consequently. Therefore, it is suggested that the SVFR especially intensified by ultrasound irradiation has the ability to provide efficient mixing performance for the fine-particle synthesis process.

DQMOM-IEM Mixing Swirling vortex flow reactor Turbulent reacting flow Ultrasound intensification

English

First

CHEMISTRY

2-s2.0-85148537331

Scopus

1.Guangdong Provincial Key Laboratory of Turbulence Research and Applications,Center for Complex Flows and Soft Matter Research and Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics,Engineering Applications,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Mechanical,Materials and Manufacturing Engineering,University of Nottingham Ningbo China,Ningbo,315100,China

Liu，Lu,Yang，Xiaogang,Guo，Yanqing,et al. Reactive mixing performance for a nanoparticle precipitation in a swirling vortex flow reactor[J]. ULTRASONICS SONOCHEMISTRY,2023,94.

Liu，Lu,Yang，Xiaogang,Guo，Yanqing,Li，Bin,&Wang，Lian Ping.(2023).Reactive mixing performance for a nanoparticle precipitation in a swirling vortex flow reactor.ULTRASONICS SONOCHEMISTRY,94.

Liu，Lu,et al."Reactive mixing performance for a nanoparticle precipitation in a swirling vortex flow reactor".ULTRASONICS SONOCHEMISTRY 94(2023).