基于折射率匹配实验图像指标的含液颗粒物质系统内部固体体积分数重构
Reconstruction of the internal volume fraction for particle-liquid system from imaging indicators by refractive index matching
孙云辉 1焦佳珺 1安翼 2王晓亮 1刘青泉1
作者信息
- 1. School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China
- 2. Key Laboratory for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China
- 折叠
摘要
折射率匹配技术被广泛用于研究颗粒-液体混合流动,但是目前针对其固体体积分数的确定为经验性的且缺乏理论或实验支撑.为了合理确定内部体积分数,本文开展了系统的标定实验来研究固体体积分数和图像指标的关系.结果表明基于面积分数的模型由于颗粒表观尺寸的不稳定性,会产生较大的误差,传统使用的正比例模型仅在靠近标定点附近的体积分数成立.本文提出了基于Voronoi多边形等效直径的预测模型,结果表明该模型更为准确且稳定,该模型被进一步应用于颗粒-液体斜槽流动中以研究内部体积分数剖面和底部应力.
Abstract
Refractive index matching(RIM)is widely used to investigate particle-liquid mixture flows.However,determining the volume fraction φ in RIM is generally empirical and lacks theoretical or experimental basis.To reasonably reconstruct the internal φ,this study performs systematic calibration experiments to study the relationship between φ and the imaging indicators.The results show that the model based on area fraction c2D will induce a large error for low φ owing to the instability of the particle's apparent size.The traditionally adopted proportional function φ=ac2D is only valid for φ near the calibration point.A predictive model is proposed based on the size of the Voronoi cell,dpoly,which proves to be more accurate and stable in RIM experiments.The dpoly-based model is applied to dense granular flows down an inclined plane to study the internal profiles of φ and the bottom normal stress.
关键词
Refractive index matching/Volume fraction/Area fraction/Voronoi diagram/Inclined flowKey words
Refractive index matching/Volume fraction/Area fraction/Voronoi diagram/Inclined flow引用本文复制引用
基金项目
国家自然科学基金(12032005)
国家自然科学基金(12172057)
出版年
2024
NETL
NSTL
万方数据