利用粒子影速仪测量和分析微米级单个粒子的冲击动态参数

IF 3.9 3区 环境科学与生态学 Q2 ENGINEERING, CHEMICAL Journal of Aerosol Science Pub Date : 2024-02-27 DOI:10.1016/j.jaerosci.2024.106355
Zhimin Zheng, Qichao Sun, Ninghao Zhang, Bo Shen, Xinqing Gao, Mingqiang Gao, Junchao Xu
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引用次数: 0

摘要

微小颗粒的冲击动力学仍然是一个引人入胜的研究课题,有助于解释与生产和日常生活相关的各种现象。本研究开发了一套结合硬件、软件和数值模拟方法的高精度测量系统,利用粒子影速仪(PSV)测定高温条件下微小单颗粒的冲击动力学参数。以测量三个标准颗粒的冲击动力学参数(冲击速度、冲击角度、恢复系数、临界粘滞速度等)为例,验证了该测量系统的可靠性。结果证明了所开发的颗粒图像处理算法的可靠性。有必要对小颗粒在低冲击速度下的冲击速度和反弹速度进行修正。颗粒大小对颗粒撞击中正常恢复系数的变化特征有重大影响。临界粘滞速度与颗粒尺寸之间存在幂函数关系。本文为今后研究锅炉领域或其他相关领域生产的粉煤灰颗粒的冲击动力学提供了有力的技术指导。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Measurement and analysis of impact dynamic parameters of micron-sized single particles using particle shadow velocimetry

The impact dynamics of micro-sized particles is still a fascinating topic of research, which can contribute to the understanding of the mechanisms of adhesion and rebound of these particles. A high-precision measurement system was developed that combines hardware, software, and numerical simulation methods to determine the impact dynamics parameters of micro-sized single particles under high temperature conditions by using Particle Shadow Velocimetry (PSV). The impact dynamic parameters of three standard particles (impact velocity, impact angle, coefficient of restitution, critical sticking velocity, etc.) were measured as examples to validate the reliability of this measurement system. The results demonstrated the reliability of the developed particle image processing algorithm. Corrections on the impact velocity and rebound velocity of small particles at low impact velocities were necessary. Particle size had a significant influence on the variation characteristics of the normal coefficient of restitution in particle impacts. A power function relationship between the critical sticking velocity and particle size was obtained. This paper provides a strong technical guidance for the future research on the impact dynamics of fly ash particles produced in the boiler field or other related fields.

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来源期刊
Journal of Aerosol Science
Journal of Aerosol Science 环境科学-工程:化工
CiteScore
8.80
自引率
8.90%
发文量
127
审稿时长
35 days
期刊介绍: Founded in 1970, the Journal of Aerosol Science considers itself the prime vehicle for the publication of original work as well as reviews related to fundamental and applied aerosol research, as well as aerosol instrumentation. Its content is directed at scientists working in engineering disciplines, as well as physics, chemistry, and environmental sciences. The editors welcome submissions of papers describing recent experimental, numerical, and theoretical research related to the following topics: 1. Fundamental Aerosol Science. 2. Applied Aerosol Science. 3. Instrumentation & Measurement Methods.
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