Investigation and control of the liquid flow through nanoscalic packed beds

所述提议的目的是研究不可压缩液体通过由纳米尺度颗粒组成的填充床的流动。在填充床中，当液体流过多孔结构时，单个颗粒随机且密集地分布。本项目中考虑的填充床由10至1000 nm范围内的刚性颗粒组成。虽然在过去已经深入研究了通过具有较大颗粒尺寸的宏观填充床的流动，但是液体通过纳米尺度填充床的通道尚未成为流体动力学和过程工程中的研究焦点。与大尺度填充床相比，纳米尺度系统具有高得多的比表面，其与通过其的液体流强烈地相互作用。众所周知，在纳米范围内，颗粒表面的电动效应起着重要作用。这些效应取决于液体的电解性质和颗粒表面的电性质。我们想研究这些效应在多大程度上可以用来控制流动和床层结构。通过将部分液体固定在电化学双电层内，可以增加或减少渗透，甚至打开或关闭渗透，这似乎是合理的。应调查烧结膜和一般膜的类似物。

The objective of the described proposal is the study of flow of an incompressible liquid through a packed bed composed of nanoscalic particles. In a packed bed single particles are randomly and densely distributed while a liquid flows through the porous structure. The packed beds considered in this project, consist of rigid particles in the range between 10 and 1000 nm. While the flow through macroscalic packed beds with larger particle sizes has been investigated intensely in the past, the passage of a liquid through a nanoscalic packed bed has not yet been the focus of research in fluid dynamics and process engineering. In comparison to macroscalic packed beds, nanoscalic systems have a much higher specific surface which strongly interacts with the liquid flow through it. It is well known that electrokinetic effects at the particle surface play an important role in that nanometer range. Those effects depend on the electrolytic properties of the liquid and the electric properties of the particle surfaces. We want to investigate how far those effects can be used to control the flow and the bed struture. It seems reasonable that the permeation can be increased or decreased or even switched on or off by immobilizing part of the liquid inside the electrochemical double layer. Analogies to sintered membranes and membranes in general shall be surveyed.