接近平衡相变的微观流变学
Microrheology close to an equilibrium phase transition
摘要：
本文研究了在接近液-气相边界的热力学条件下，二维胶体悬浮液对示踪粒子的微观结构和微观流变响应。在双结点的液体侧，增加（排斥性）示踪剂的速度导致发展明显的空化泡，其中胶体颗粒的浓度强烈耗尽。液体空化的趋势由无量纲胶体空化数表征。在气体侧的双节点，一个拉（有吸引力的）示踪剂留下一个延长的痕迹的胶体液体，所产生的下游平流的润湿层在其表面上。对于这两种情况下的速度依赖的摩擦计算。
英文摘要：
We investigate the microstructural and microrheological response to a tracer particle of a two- dimensional colloidal suspension under thermodynamic conditions close to a liquid-gas phase bound- ary. On the liquid side of the binodal, increasing the velocity of the (repulsive) tracer leads to the development of a pronounced cavitation bubble, within which the concentration of colloidal parti- cles is strongly depleted. The tendency of the liquid to cavitate is characterized by a dimensionless colloidal cavitation number. On the gas side of the binodal, a pulled (attractive) tracer leaves behind it an extended trail of colloidal liquid, arising from downstream advection of a wetting layer on its surface. For both situations the velocity dependent friction is calculated.
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