Bulk elastic fingering instability in Hele-Shaw cells.
Bulk elastic fingering instability in Hele-Shaw cells.
复制标题
Hele-Shaw 细胞中的体弹性指法不稳定。
DOI：
10.1103/physrevlett.111.047801
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
E. Bouchaud
中科院分区：
文献类型：
--
作者：
B. Saintyves;O. Dauchot;E. Bouchaud
我们从实验上证明了纯弹性、无粘性指进不稳定性的存在，这种不稳定性是空气穿透Hele-Shaw单胞中的弹性体时产生的。一旦超过了与弹性模数无关的临界应变，手指就会按顺序出现，并在材料的整体内传播。不稳定的驱动力中的关键因素是凝胶的限制及其与细胞平板的粘连，这导致在气泡生长过程中消耗相当大的弹性能量。
We demonstrate experimentally the existence of a purely elastic, nonviscous fingering instability which arises when air penetrates into an elastomer confined in a Hele-Shaw cell. Fingers appear sequentially and propagate within the bulk of the material as soon as a critical strain, independent of the elastic modulus, is exceeded. Key elements in the driving force of the instability are the confinement of the gel and its adhesion to the plates of the cell, which result in a considerable expense of elastic energy during the growth of the air bubble.