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The electrokinetic energy conversion analysis of viscoelastic Maxwell nanofluids with couple stress in circular microchannels

Physics of Fluids, ISSN: 1089-7666, Vol: 36, Issue: 9
2024
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Studies from Inner Mongolia University of Technology Further Understanding of Electrokinetics (The Electrokinetic Energy Conversion Analysis of Viscoelastic Maxwell Nanofluids With Couple Stress In Circular Microchannels)

2024 OCT 09 (NewsRx) -- By a News Reporter-Staff News Editor at Energy Daily News -- Current study results on Nanotechnology - Electrokinetics have been

Article Description

The present study focuses on the unsteady flow of a viscoelastic Maxwell nanofluid with couple stress in a circular microchannel under the combined action of periodic pressure and magnetic field. The Green's function method is applied to the unsteady Cauchy momentum equation to derive the velocity field. We strive to check out the analytical solutions of the current model by validating them with existing results. In addition, the effects of several dimensionless parameters (such as the couple stress parameter γ, the Deborah number De, and the dimensionless frequency ω) on the streaming potential and the electrokinetic energy conversion (EKEC) efficiency of the three waveforms (cosine, square, and triangular) are portrayed via graphical illustrations. Within the range of parameters chosen in this study, the results demonstrate that increasing the value of the Deborah number or decreasing the dimensionless frequency can effectively enhance the streaming potential. The velocity field and EKEC efficiency are improved with increasing couple stress parameters. Furthermore, our investigation is extended to compare the EKEC efficiency for square and triangular waveforms when the couple stress parameters are set to 20 and 40, respectively. The results also indicate that increasing the couple stress parameter significantly improves the EKEC efficiency, particularly in the context of the square waveform. These findings will provide valuable assistance in the design of periodic pressure-driven microfluidic devices.

Bibliographic Details

Yue Zhang; Guangpu Zhao; Yaxin Hou; Jiali Zhang; Bo Xue

AIP Publishing

Engineering; Physics and Astronomy; Chemical Engineering

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