Steric and Slippage Effects on Mass Transport by Using an Oscillatory Electroosmotic Flow of Power-Law Fluids
| Autor: | Oscar Bautista, J. Arcos, Ruben Baños, Federico Méndez |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Steric effects
Materials science boundary slip Thermodynamics 02 engineering and technology 01 natural sciences Article 010305 fluids & plasmas power-law fluids Momentum symbols.namesake Womersley number Rheology 0103 physical sciences Steric factor TJ1-1570 mass transport rate Mechanical engineering and machinery Electrical and Electronic Engineering Debye length Mechanical Engineering oscillatory electroosmotic flow 021001 nanoscience & nanotechnology Condensed Matter::Soft Condensed Matter Control and Systems Engineering symbols Slippage 0210 nano-technology steric effect Displacement (fluid) |
| Zdroj: | Micromachines, Vol 12, Iss 539, p 539 (2021) Micromachines Volume 12 Issue 5 |
| Popis: | In this paper, the combined effect of the fluid rheology, finite-sized ions, and slippage toward augmenting a non-reacting solute’s mass transport due to an oscillatory electroosmotic flow (OEOF) is determined. Bikerman’s model is used to include the finite-sized ions (steric effects) in the original Poisson-Boltzmann (PB) equation. The volume fraction of ions quantifies the steric effects in the modified Poisson-Boltzmann (MPB) equation to predict the electrical potential and the ion concentration close to the charged microchannel walls. The hydrodynamics is affected by slippage, in which the slip length was used as an index for wall hydrophobicity. A conventional finite difference scheme was used to solve the momentum and species transport equations in the lubrication limit together with the MPB equation. The results suggest that the combined slippage and steric effects promote the best conditions to enhance the mass transport of species in about 90% compared with no steric effect with proper choices of the Debye length, Navier length, steric factor, Womersley number, and the tidal displacement. |
| Databáze: | OpenAIRE |
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