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Electrokinetic energy conversion of power-law fluids in a slit nanochannel beyond Debye-Hückel linearization

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  • Xie, Zhiyong
  • Jian, Yongjun

Abstract

Electrokinetic energy conversion of power-law fluids is analyzed in a slit nanochannel. Electrical potential distribution is considered without Debye-Hückel linear approximation. The general analytical expressions of flow velocity and streaming potential are obtained for arbitrary power-law behavior indexes. Due to the strongly nonlinear constitutive relation of power-law fluids, the energy conversion efficiency is analyzed numerically. Results show that the electrokinetic energy conversion efficiency can be underestimated for the same physics parameters, when the Debye-Hückel linear approximation is applied. The conversion efficiency of pseudoplastic fluids is larger than that of dilatant and Newtonian fluids. The maximum in conversion efficiency of pseudoplastic fluids (n = 0.8) is about 5% and it is more than 78% than that of dilatant fluids (n = 1.2). Finally, the optimal flow parameters exist and such optimal values can be used to design an energy converter with high conversion efficiency.

Suggested Citation

  • Xie, Zhiyong & Jian, Yongjun, 2022. "Electrokinetic energy conversion of power-law fluids in a slit nanochannel beyond Debye-Hückel linearization," Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:energy:v:252:y:2022:i:c:s036054422200932x
    DOI: 10.1016/j.energy.2022.124029
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    References listed on IDEAS

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    1. Liu, Yongbo & Jian, Yongjun & Yang, Chunhong, 2020. "Electrochemomechanical energy conversion efficiency in curved rectangular nanochannels," Energy, Elsevier, vol. 198(C).
    2. Xie, Zhiyong & Jian, Yongjun, 2020. "Electrokinetic energy conversion of nanofluids in MHD-based microtube," Energy, Elsevier, vol. 212(C).
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