Vlasova Olga, Kozlov Nikolai
Laboratory of Vibrational Hydromechanics, Perm State Humanitarian Pedagogical University, 24, Sibirskaya, 614990, Perm, Russia.
Laboratory of Hydrodynamic Stability, Institute of Continuous Media Mechanics UrB RAS, PFRC, 1, Akademika Koroleva, 614013, Perm, Russia.
Eur Phys J E Soft Matter. 2018 Feb 20;41(2):26. doi: 10.1140/epje/i2018-11632-9.
The behaviour of a heavy cylindrical body in a rotating horizontal cylindrical cavity filled with viscous liquid is investigated experimentally. Several modes of the body behaviour depending on the rate of the cavity rotation, i.e., the ratio of the centrifugal force of inertia and the gravity, are detected. At a fast rotation rate, the body makes the solid-body rotation, remaining immobile relative to the cavity due to the action of the centrifugal force. In the absence of rotation, under the influence of gravity, the body occupies a position in the lower part of the cavity. At slow uniform rotation rate, the body is dragged by the cavity boundary and shifts to some angle relative to the initial position. With an increase in the rotation rate, the body is repulsed from the cavity boundary and occupies a suspended position, stationary in the laboratory frame, at a certain distance from it. In the suspension regime and the partial repulsion regime, which precedes it, the body performs auto-oscillations that resemble the precession. The flow structures near the suspended cylinder are studied using the PIV method.
对一个重圆柱体在充满粘性液体的旋转水平圆柱腔内的行为进行了实验研究。根据腔的旋转速率，即离心惯性力与重力的比值，检测到了几种物体行为模式。在快速旋转速率下，物体进行刚体旋转，由于离心力的作用，相对于腔保持静止。在不旋转的情况下，在重力的影响下，物体占据腔下部的一个位置。在缓慢匀速旋转速率下，物体被腔边界拖动并相对于初始位置偏移一定角度。随着旋转速率的增加，物体从腔边界被排斥，并在离它一定距离处占据一个在实验室坐标系中静止的悬浮位置。在悬浮状态及其之前的部分排斥状态下，物体进行类似于进动的自激振荡。使用粒子图像测速（PIV）方法研究了悬浮圆柱体附近的流动结构。
