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Analysis of combined electroosmotic and pressure-driven flow in cylindrical microchannels considering interfacial slip effects and slip-dependent zeta potential
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Hossein Tamim *   |
| Department of Mechanical Engineering, Ar.C., Islamic Azad University, Arak, Iran , hossein.tamim@iau.ac.ir |
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Abstract: (14 Views) |
The main objective of this research is the analytical study of the combined electroosmotic and pressure-driven flow of an aqueous solution in a cylindrical microchannel. The effects of interfacial slip and slip-dependent zeta potential are also considered. The governing equations, including the Poisson-Boltzmann equation and the equation of motion, have been analytically solved, and the influence of all physical and electrokinetic parameters on the electrical potential distribution, velocity profile, and related parameters such as skin friction coefficient and volumetric flow rate have been investigated. The results show that surface slip has a significant impact on the flow field and electrical potential distribution, such that an increase in slip length results in an increase in both electrical potential and flow velocity. A similar behavior is observed with the growth of the zeta potential on the wall surface of the microchannel. By applying a reverse pressure gradient and increasing it, reverse flows gradually emerge at the center of the microchannel, which may lead to the formation of negative flow rates (overall flow in the opposite direction). The highest volumetric flow rate and friction coefficient occur in the presence of the thinnest electrical double layers (larger Debye parameter), whereas an opposite trend is observed for thicker double layers. The variations of volumetric flow rate and friction coefficient with respect to the pressure gradient parameter are linear. |
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| Keywords: Electroosmotic flow, Microchannel, Interfacial slip, Slip-dependent zeta potential, Analytical solution |
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Full-Text [PDF 1996 kb]
(9 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2025/12/20 | Accepted: 2026/02/12 | Published: 2026/03/1
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| * Corresponding Author Address: hossein.tamim@iau.ac.ir |
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