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Segregation of binary particles in gas-solid fluidized bed

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Abstract

Particle segregation and mixing behavior play a crucial role in industrial processes. This study investigates the saturated jetsam fraction, which indicates the maximum capacity of flotsam to entrain jetsam, in an initially separated binary fluidized bed with particle size differences. According to the value of saturated jetsam fraction, three distinct regimes—segregation, mixing, and an intermediate regime—are identified. Moreover, intriguing relationships between the saturated jetsam fraction and superficial gas velocity are observed, exhibiting monotonic trends in both the segregation and mixing regimes, while a unique volcano-shaped curve in the intermediate regime. Additionally, a comprehensive entrainment model based on two-fluid model elucidates the observed phenomena, emphasizing the significance of mixing behavior in fluidized layer on the saturated jetsam fraction. This work offers potential insights for evaluating segregation in industrial applications.

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Acknowledgements

We would like to thank the financial support from the National Natural Science Foundation of China (Grant Nos. 22308187, 22208186, 22278238, and 22238004), the Beijing Nova Program (Grant No. 2022118), the Key Research and Development Program of Inner Mongolia and Ordos, and the Ordos-Tsinghua Innovative & Collaborative Research Program in Carbon Neutrality (Ordos Laboratory). We would also like to express our gratitude to Fan Duan of Xi’an Jiaotong University for his valuable discussions on the manuscript.

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China

    Yaxiong Yu, Feng Lu, Fei Wei & Chenxi Zhang

  2. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, 710049, China

    Xuan He

  3. Ordos Laboratory, Ordos, 017010, China

    Fei Wei & Chenxi Zhang

  4. Institute for Carbon Neutrality, Tsinghua University, Beijing, 100084, China

    Chenxi Zhang

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  1. Yaxiong Yu
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  2. Feng Lu
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  3. Xuan He
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  4. Fei Wei
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Correspondence to Chenxi Zhang.

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Competing interests The authors declare that they have no competing interests.

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Yu, Y., Lu, F., He, X. et al. Segregation of binary particles in gas-solid fluidized bed. Front. Chem. Sci. Eng. 18, 68 (2024). https://doi.org/10.1007/s11705-024-2426-0

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