Wildman R D, Martin T W, Krouskop P E, Talbot J, Huntley J M, Parker D J
School of Mechanical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Jun;71(6 Pt 1):061301. doi: 10.1103/PhysRevE.71.061301. Epub 2005 Jun 14.
The response to vibration of a granular bed, consisting of a standard cylindrical geometry but with the addition of a dissipative cylindrical inner wall, has been investigated both experimentally (using positron emission particle tracking) and numerically (using hard sphere molecular dynamics simulation). The packing fraction profiles and granular temperature distributions (in both vertical and horizontal directions) were determined as a function of height and distance from the axis. The two sets of results were in reasonable agreement. The molecular dynamics simulations were used to explore the behavior of the granular bed in the inner wall-outer wall coefficient of restitution phase space. It was observed that one could control the direction of the toroidal convection rolls by manipulating the relative dissipation at the inner and outer walls via the coefficients of restitution, and with several layers of grains it was seen that double convection rolls could also be formed, a result that was subsequently confirmed experimentally.
研究了由标准圆柱形几何形状但添加了耗散圆柱形内壁组成的颗粒床对振动的响应，采用了实验方法（使用正电子发射粒子跟踪）和数值方法（使用硬球分子动力学模拟）。确定了堆积分数分布和颗粒温度分布（在垂直和水平方向）作为高度和距轴距离的函数。两组结果吻合良好。分子动力学模拟用于探索颗粒床在内壁 - 外壁恢复系数相空间中的行为。观察到可以通过恢复系数控制内壁和外壁处的相对耗散来控制环形对流卷的方向，并且对于多层颗粒，可以看到还能形成双对流卷，这一结果随后通过实验得到了证实。
