粉末的冲击诱导分散模式具有不同的物理性质
Jaehun Yoo1,2, Ji Hoon Kim2, Daegyoum Kim1
1Department of Mechanical Engineering, KAIST, Daejeon 34141, Republic of Korea. daegyoum@kaist.ac.kr.
Soft matter
|April 17, 2025
概括
冲击波导致粉末的不稳定性和喷射. 像凝聚力和透性这样的粒子特性显著影响这种分散,影响工业冲击波应用.
科学领域:
- 物理 物理学 物理
- 材料科学 材料科学 材料科学
- 流体动力学 流体动力学
背景情况:
- 冲击波诱导复杂的不稳定性和喷射在粉末.
- 了解粒子分散对于涉及冲击波的工业过程至关重要.
研究的目的:
- 实验性地研究粒子物理性质对冲击波压力下的粉末分散的影响.
- 分析不同的喷射模式及其对初始粉体半径和凝聚力的依赖.
主要方法:
- 利用实验室规模的Hele-Shaw细胞使用纳米能量材料产生压力脉冲.
- 定量评估粒子凝聚力对内部边界不稳定性和指纹结构形态学的影响.
- 进行缩放分析以确定粉末边界变化的特征时间尺度.
主要成果:
- 确定了由内部或外部边界不稳定性引发的明显喷射模式,取决于初始粉体半径.
- 量化了粒子凝聚力对不稳定性和手指形态学的影响.
- 证明与颗粒大小相关的粉末透性会影响压缩不稳定性和膨胀相流.
结论:
- 颗粒的性质决定了冲击诱导的粉末分散和喷射.
- 结果为提高工业冲击波应用中粒子分散的预测提供了洞察力.
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