气压环境对水平旋转滚筒内岩土颗粒材料流动特性的影响

Impact of Atmospheric Pressure Environment on Flow Characteristics of Geotechnical Granular Materials in a Horizontally Rotating Drum

摘要:

通过自行设计的低气压水平旋转滚筒实验装置，结合数字图像处理技术，捕获不同气压环境下颗粒崩塌流的各项特征参数，研究气压环境对颗粒材料流动特性的影响。研究发现，低气压环境下，颗粒崩塌流上休止角和下休止角都会有不同程度的减小，滚筒内颗粒堆积体的稳定性降低和流动性有所增强；对于整个水平滚筒颗粒流崩塌系统而言，在低气压环境下，由于缺乏空气分子（气流）引起的额外扰动，系统整体趋于更有序、更稳定的运动状态；崩塌角和崩塌持续时间对于气压环境的影响并不敏感。

Abstract:

A self-designed low-pressure horizontal rotating drum experimental setup， combined with digital image processing technology， was used to capture various characteristic parameters of particle flow under different atmospheric pressure conditions， in order to study the impact of atmospheric pressure on the flow characteristics of particle materials. The results show that under low-pressure conditions， both the upper and lower repose angles of the particle avalanche flow decrease to varying degrees， reducing the stability of the particle accumulation in the drum and enhancing its flowability. For the entire horizontal drum particle flow collapse system， the lack of additional disturbances caused by air molecules （airflow） under low-pressure conditions diminishes external disturbances， leading to a more ordered and stable state of motion. The collapse angle and collapse duration， however， are not highly sensitive to changes in atmospheric pressure.