the effect of fumed silica nanoparticles on the drag reduction of air-water interface

Due to the development of nanoscience and its importance in human health and the biocompatibility of nanomaterials, extensive research and studies are needed to identify the properties and effects of nanoparticles# in this research, the properties of nanoparticles solution and their effects on friction factor in multiphase flows has been studied# here, an innovative tool is applied to study the drag force on the interface in presence of nanoparticles at very diluted solution# results show that velocity increases of np solutions against pure water at earlier stage of rising, revealed the increase of surface slippage, correspond to drag reduction of interface# in second stage of rising, dal formation is responsible for decreasing the velocity#