摘要
通过实验测量了准二维容器中颗粒物质对流运动的轨迹、流动区域、速率分布及周长和周期.实验结果表明:与流体的一般流动不同,准二维容器中颗粒物质的对流即使在流速不大的情况下也是非稳定流动.分析了影响对流非稳定性的因素,引入q因子,通过流量守恒定律半定量地确定了各因素对流动非稳定性的影响程度.
The convection flow in 2D vertically oscillated granular layers is studied. The trajecto- ry, speed distribution and area of flow are obtained. The results show clearly that the convection flow is unstable even when the flow rate is lower. The factor q is introduced in order to describe the instability. Factors leading to the instability are analyzed and unstable degrees in some areas are determined through the conservation law of flow rate.
出处
《物理实验》
2007年第6期18-20,28,共4页
Physics Experimentation
基金
国家自然科学基金(No.10374021)
贵州省科技厅基金(No.20074006)
贵州省省长基金(No.20061228)
贵州省高层次基金(No.2007008)
贵州大学SRT计划项目基金(No.2006014)
关键词
颗粒物质
振动对流
非稳定流动
granular layer
convection flow
unstable oscillation
