Applied Mathematics and Mechanics (English Edition) ›› 2022, Vol. 43 ›› Issue (2): 263-274.doi: https://doi.org/10.1007/s10483-022-2810-7

• 论文 • 上一篇    下一篇

On the energy conversion in electrokinetic transports

Zhaodong DING1, Long CHANG2, Kai TIAN1, Yongjun JIAN1   

  1. 1. School of Mathematical Science, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China;
    2. School of Statistics and Mathematics, Inner Mongolia University of Finance and Economics, Hohhot 010021, Inner Mongolia, China
  • 收稿日期:2021-05-07 修回日期:2021-11-10 发布日期:2022-01-25
  • 通讯作者: Yongjun JIAN, E-mail:jianyj@imu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Nos. 11902165, 11772162, and 11862018), the Natural Science Foundation of Inner Mongolia Autonomous Region of China (Nos. 2019BS01004 and 2021MS01007), and the Inner Mongolia Grassland Talent (No. 12000- 12102013)

On the energy conversion in electrokinetic transports

Zhaodong DING1, Long CHANG2, Kai TIAN1, Yongjun JIAN1   

  1. 1. School of Mathematical Science, Inner Mongolia University, Hohhot 010021, Inner Mongolia, China;
    2. School of Statistics and Mathematics, Inner Mongolia University of Finance and Economics, Hohhot 010021, Inner Mongolia, China
  • Received:2021-05-07 Revised:2021-11-10 Published:2022-01-25
  • Contact: Yongjun JIAN, E-mail:jianyj@imu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Nos. 11902165, 11772162, and 11862018), the Natural Science Foundation of Inner Mongolia Autonomous Region of China (Nos. 2019BS01004 and 2021MS01007), and the Inner Mongolia Grassland Talent (No. 12000- 12102013)

摘要: Energy conversion in micro/nano-systems is a subject of current research, among which the electrokinetic energy conversion has attracted extensive attention. However, there exist two difierent deflnitions on the electrokinetic energy conversion e–ciency in literature. A few researchers deflned the e–ciency using the pure pressure-driven flow rate, while other groups deflned the e–ciency based on the flow rate with the inclusion of the efiect of the streaming potential fleld. In this work, both deflnitions are investigated for difierent fluid types under the periodic electrokinetic flow condition. For Newtonian fluids, the two deflnitions give similar results. However, for viscoelastic fluids, these two deflnitions lead to signiflcant difierence. The e–ciency deflned by the pure pressure-driven flow rate even exceeds 100% in a certain range of the parameters. The result shows that in the case of viscoelastic flow, it is incorrect to deflne the energy conversion e–ciency by pure pressure-driven flow rate. At the same time, the reason for this problem is clarifled through comprehensive analysis.

关键词: electrokinetic transport, energy conversion e–ciency, Newtonian fluid, viscoelastic fluid, streaming potential fleld

Abstract: Energy conversion in micro/nano-systems is a subject of current research, among which the electrokinetic energy conversion has attracted extensive attention. However, there exist two difierent deflnitions on the electrokinetic energy conversion e–ciency in literature. A few researchers deflned the e–ciency using the pure pressure-driven flow rate, while other groups deflned the e–ciency based on the flow rate with the inclusion of the efiect of the streaming potential fleld. In this work, both deflnitions are investigated for difierent fluid types under the periodic electrokinetic flow condition. For Newtonian fluids, the two deflnitions give similar results. However, for viscoelastic fluids, these two deflnitions lead to signiflcant difierence. The e–ciency deflned by the pure pressure-driven flow rate even exceeds 100% in a certain range of the parameters. The result shows that in the case of viscoelastic flow, it is incorrect to deflne the energy conversion e–ciency by pure pressure-driven flow rate. At the same time, the reason for this problem is clarifled through comprehensive analysis.

Key words: electrokinetic transport, energy conversion e–ciency, Newtonian fluid, viscoelastic fluid, streaming potential fleld

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