The one large glass bead was placed in a vibrated bed and the rising velocity of the one was measured to characterize the convection strength.

• 实验方法是藉由改变液体黏度及含量来观察一大颗粒体于小颗粒床内随时间上升之过程，利用大粒子上升速度及边壁粒子下降速度来表示颗粒振动床中迴流运动的强弱大小。