Segregation of binary particles in gas-solid fluidized bed

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL Frontiers of Chemical Science and Engineering Pub Date : 2024-05-09 DOI:10.1007/s11705-024-2426-0

Yaxiong Yu, Feng Lu, Xuan He, Fei Wei, Chenxi Zhang

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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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气固流化床中二元颗粒的分离

颗粒偏析和混合行为在工业流程中起着至关重要的作用。本研究调查了饱和喷射流部分，该部分表示在具有粒度差异的初始分离二元流化床中絮凝物夹带喷射流的最大能力。根据饱和浮渣分数的值，确定了三种不同的状态--分离、混合和中间状态。此外，还观察到饱和喷射液分数与表面气体速度之间的奇妙关系，在偏析和混合体系中都呈现出单调的趋势，而在中间体系中则呈现出独特的火山状曲线。此外，基于双流体模型的综合夹带模型阐明了观察到的现象，强调了流化层中的混合行为对饱和喷射流分数的重要意义。这项研究为评估工业应用中的偏析现象提供了潜在的启示。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.