https://doi.org/10.1140/epjp/s13360-024-05562-9
Regular Article
Electrokinetic energy conversion of two immiscible Newtonian fluids with pressure-dependent viscosities in the microchannel
1
College of Sciences, Inner Mongolia University of Technology, 010051, Hohhot, Inner Mongolia, People’s Republic of China
2
Transportation Institute, Inner Mongolia University, 010021, Hohhot, Inner Mongolia, People’s Republic of China
b
zhaoguangpu105@sina.com
e
909293618@qq.com
Received:
24
June
2023
Accepted:
16
August
2024
Published online:
4
September
2024
By perturbation method, this article presents asymptotic analytical solutions for streaming potential and electrokinetic energy conversion (EKEC) efficiency of two immiscible fluids between microparallel plates. The results show that the EKEC efficiency can be enhanced obviously by the permittivity and viscosity ratios, the maximum efficiency is about 67% and 28%, respectively, but shows a decreasing trend with the interface electric potential difference, the maximum efficiency is about 44%. This indicates that the permittivity and viscosity ratios can improve the energy conversion efficiency. Furthermore, we company the EKEC efficiency in two-layer and single-layer fluid. It is found that the conversion efficiency of two-layer fluid systems can be higher than that of single-layer fluid systems by up to 50%. This work adds a quantitative dimension to the understanding of the interplay between physical parameters, and manipulation of interfaces can effectively facilitate the separation of biological samples and direct the flow direction of fluids in flow-switching devices.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
