The subject of this paper is to give an insight into the fluid dynamics when nanoscale or submicron particles are handled in filtration or separation processes.The differences of the forces on particles in macroscale and nano- scale are presented and discussed in detail.The differences can be separated according to particle-particle interac- tion,the interaction with the surrounding fluid and the influences of external fields.It is evident that the behaviour of nanoparticles suspended in a fluid depends strongly on the surface properties of the suspended material.As examples,the flow through a nanoscale packed bed and the dispersion process of nanoscale particles is dis- cussed.It is shown that the permeation through a nanoscale structure is influenced by electrostatic and electrovis- cous effects.Electrostatic effects have an influence on the aggregate structure while the electroviscous effects directly influence the permeation.
展开▼
