School of Chemical and Biomolecular Engineering, Cornell University, Ithaca, New York 14853, USA.
Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA.
Phys Rev Lett. 2014 Sep 26;113(13):134501. doi: 10.1103/PhysRevLett.113.134501. Epub 2014 Sep 25.
We investigate the drying dynamics of porous media with two pore diameters separated by several orders of magnitude. Nanometer-sized pores at the edge of our samples prevent air entry, while drying proceeds by heterogeneous nucleation of vapor bubbles--cavitation--in the liquid in micrometer-sized voids within the sample. We show that the dynamics of cavitation and drying are set by the interplay of the deterministic poroelastic mass transport in the porous medium and the stochastic nucleation process. Spatiotemporal patterns emerge in this unusual reaction-diffusion system, with temporal oscillations in the drying rate and variable roughness of the drying front.
我们研究了两种孔径相差几个数量级的多孔介质的干燥动力学。样品边缘的纳米级孔阻止空气进入，而干燥则是通过在样品内部的微米级空隙中的液体中进行蒸气泡（空化）的异质成核来进行的。我们表明，空化和干燥的动力学是由多孔介质中确定性的多孔弹性质量传输和随机成核过程的相互作用所决定的。在这个不寻常的反应-扩散系统中出现了时空模式，干燥速率的时间振荡和干燥前沿的可变粗糙度。
