Slippage of binary fluid mixtures in a nanopore

Abstract

International audienceThis work focuses on the slip phenomenon at the fluid-solid interface accompanying Poiseuille flow of simple binary miscible fluids in a slit nanopore. To explore such flows, molecular dynamics simulations are used on Lennard-Jones binary mixtures composed of species of varying affinities with the walls. The results have shown that the apparent slip magnitude at the fluid-solid interface depends largely on the species that is dominant in contact with the walls. In addition, it has been shown that the velocity profiles of each species (of different "wettability") does not superpose with the velocity profile of the mixture and such a result points out the limitations of the classical approaches based on a single momentum conservation equation to deal with mixtures flow in nanochannels

Convection with Local Thermal Non-Equilibrium and Microfluidic Effects

“…[14,151,209,329,330,450,482], and the review of numerical techniques by [481]. We should also point out extensive recent activity in a very closely related field namely that of triply diffusive convection, involving a temperature field and two different salt fields, see [68,69,84,372,374,401], and the references therein.…”

“…In particular, at nanoscales there is increasing evidence that boundary conditions of slip type are needed rather than those of no-slip, cf. [14,24,83,118,119,234,295,350,358,382,383,402,408,489,494,496]. An especially important application of microscale flow involving slip boundary conditions is to flow in porous metallic foams.…”

“…In fact, boundary conditions which incorporate slip have been suggested for a long time starting with the early work of [304] and [278]. They are the subject of intense recent work, especially in microfluidic and nanofluidic situations, as witnessed by [14,24,64,118,119,233,295,350,382,383,489,494,496], and many references including historical ones are given in these articles. A lucid historical account of the origin of slip boundary conditions in also given in chapter 1 of Webber [474].…”

“…We should also point out extensive recent activity in a very closely related field namely that of triply diffusive convection, involving a temperature field and two different salt fields, see [68,69,84,372,374,401], and the references therein. Furthermore, within microfluidic situations multi-component diffusive convection is a very live field, especially involving DNA dissociation; see [11,104], and the work of [14] shows that slip boundary conditions may be important in this context.…”

Elaboration of the Demulsification Process of W/O Emulsion with Three-Dimensional Electric Spiral Plate-Type Microchannel

“…Xiao Chen designed and manufactured a plate-type PTFE-SS microchannel to achieve the continuous demulsification for kerosene in water emulsions with emulsifier, and the demulsification process was repeated 5 to 20 times, and its demulsification efficiency can be up to 90% [19]. All the above papers pointed out that the process intensification of microchannels on droplets coalescence was due to the special flow pattern [17,18,19,20] produced by O/W emulsions flowing through the microchannel, like oil droplets absorbed on the hydrophobic wall [17,19], the wall slippage [19,21,22] and the confined flow [19], which can generate an instability of O/W emulsions, accelerate the coalescence of oil droplets and result in phase separation.…”