二元颗粒粒子在振动的气体流体化层中的结构性泡:实验和模拟
Jagan Mohan Sanghishetty1, Naimah M Russ2, Christopher Spitler1
1Department of Chemical Engineering, Columbia University, New York, NY 10027, USA. cmb2302@columbia.edu.
Soft matter
|June 21, 2024
概括
在颗粒混合物中的结构性泡,由振动和气体流的联合驱动,有效地混合颗粒,无论初始配置如何. 然而,单独来自气体流的非结构性气泡会导致粒子分离.
科学领域:
- 流化动态的流体化动态
- 颗粒物质科学是颗粒物质的科学.
- 颗粒的混合和分离.
背景情况:
- 颗粒颗粒的混合和分离在工业,农业和自然过程中至关重要.
- 垂直振动和向上气流是操纵颗粒粒子行为的已知方法.
- 之前观察到单分散粒子在振动和气体流的结合下有结构的泡.
研究的目的:
- 研究不同尺寸和密度的颗粒颗粒的二元混合物中的结构性泡.
- 为了确定结构化泡与非结构化泡相比,结构化泡对粒子混合的影响.
- 用离散粒子模拟来验证实验发现,并确定连续模型的局限性.
主要方法:
- 在联合垂直振动和向上气流下对二元颗粒混合物的实验研究.
- 离散粒子模拟 (DPS) 模拟粒子行为和气泡动力学.
- 连续粒子模拟用于比较分析.
主要成果:
- 在具有相似最小流化速度的二元混合物中成功形成了结构化的泡模式.
- 结构化的泡引发了粒子的有效混合,无论它们的初始大小和密度分布如何.
- 气体流本身就产生了非结构化的气泡,导致粒子分离,与结构化的泡混合效应形成鲜明对比.
结论:
- 结合振动和气体流,诱导结构性泡,是混合颗粒式二元混合物的可行方法.
- 离散粒子模拟在质量和数量上支持结构化泡和混合的实验观测.
- 连续模拟需要进一步开发,以准确预测结构化泡场景中的混合现象.
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