Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany.
Phys Rev Lett. 2011 Jul 8;107(2):028001. doi: 10.1103/PhysRevLett.107.028001.
Pattern formation of a thin layer of vertically agitated wet granular matter is investigated experimentally. Rotating spirals with three arms, which correspond to the kinks between regions with different colliding phases, are the dominating pattern. This preferred number of arms corresponds to period tripling of the agitated granular layer, unlike predominantly subharmonic Faraday crispations in dry granular matter. The chirality of the spatiotemporal pattern corresponds to the rotation direction of the spirals.
实验研究了竖直搅动湿颗粒层的模式形成。三条臂的旋转螺旋是主要的模式，对应于不同碰撞相区域之间的扭结。与干颗粒物质中主要的次谐 Faraday 不稳定性不同，这个臂的优选数量对应于被搅动颗粒层的周期三倍。时空模式的手性与螺旋的旋转方向相对应。
