Segregation of binary particles in gas-solid fluidized bed
Yaxiong Yu1, Feng Lu1, Xuan He2, Fei Wei1,3, Chenxi Zhang1,3,4()
1. Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China 2. School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China 3. Ordos Laboratory, Ordos 017010, China 4. Institute for Carbon Neutrality, Tsinghua University, Beijing 100084, China
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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