Wulfert R, Seifert U, Speck T
II. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany.
Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7-9, 55128 Mainz, Germany.
Phys Rev E. 2016 Dec;94(6-1):062610. doi: 10.1103/PhysRevE.94.062610. Epub 2016 Dec 27.
Employing theory and numerical simulations, we demonstrate discontinuous force thinning due to the driven motion of an external probe in a host medium. We consider two cases: an ideal structureless medium (modeling ultrasoft materials such as polymer melts) and a dilute bath of interacting repulsive particles. When the driving of the probe exceeds a critical force, the microviscosity of the medium drops abruptly by about an order of magnitude. This phenomenon occurs for strong attractive interactions between a large probe and a sufficiently dense host medium.
通过运用理论和数值模拟，我们证明了由于外部探针在主体介质中的驱动运动而导致的不连续力致稀化现象。我们考虑两种情况：一种是理想的无结构介质（模拟诸如聚合物熔体之类的超软材料），另一种是相互作用的排斥性粒子的稀溶液。当探针的驱动力超过临界力时，介质的微观粘度会突然下降约一个数量级。这种现象发生在大探针与足够致密的主体介质之间存在强吸引相互作用的情况下。
