Segregation of binary particles in gas-solid fluidized bed

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.

Key words： fluidized bed; segregation; binary; bubbles; entrainment

Competing interests

The authors declare that they have no competing interests.

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.

Electronic Supplementary Material

Supplementary material is available in the online version of this article at https://doi.org/10.1007/s11705-024-2426-0 and is accessible for authorized users.

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