Atomistic Study of the Effects of Superhydrophobic Surfaces on Friction Factor of Water Flow in Nanochannels
Paper ID : 1060-ICNS
Authors:
Alireza Shadloo-jahromi *, Masoud Kharati-Koopaee, Omid Bavi
Department of Mechanical and Aerospace Engineering, Shiraz University of Technology, Shiraz, Iran
Abstract:
In this work, non-equilibrium molecular dynamics simulation has been used to investigate the friction factor of water molecules confined in silicon nanochannels. Nanometer-sized protrusions with the aligned nanopost arrangements were embedded on the silicon surfaces to achieve superhydrophobic surfaces. Seven different pillar surface fractions (PSF) were studied to evaluate the effects of PSF percent on water flow and the Darcy-Weisbach friction factor. To calculate the Darcy-Weisbach friction factor, the shear viscosity has also calculated for every seven cases. The flow of water molecules at different Reynolds numbers is obtained by applying various external forces to each water molecules. It is found that the shear viscosity decreases by decreasing the PSF. It is also indicated that the value of viscosity approaches to its bulk value in PSF=100% when the smooth wall for nanochannel is considered. We found that, by increasing the Reynolds number and decreasing the percentage of PSF, the friction coefficient decreases. These computational findings are believed to be able to provide a benchmark for investigations and applications in drug delivery, enzyme segregation as well as designing the nanofluidic devices such as lab-on-a-chip structures.
Keywords:
Superhydrophobic surfaces, Viscosity, Darcy-Weisbach friction factor, Molecular dynamics, Pillared surfaces
Status : Abstract Accepted (Poster Presentation)