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

被引：10

作者：

Xie, Zhiyong ^{[1
]}

Jian, Yongjun ^{[1
]}

机构：

[1] Inner Mongolia Univ, Sch Math Sci, Hohhot 010021, Inner Mongolia, Peoples R China

来源：

ENERGY | 2022年 / 252卷

关键词：

Electrokinetic energy; Power-law fluids; High zeta potential; Nanochannels; NON-NEWTONIAN FLUIDS; ELECTROOSMOTIC FLOW; EFFICIENCY; GENERATION; TRANSPORT; LAYER; WALL;

D O I：

10.1016/j.energy.2022.124029

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Electrokinetic energy conversion of power-law fluids is analyzed in a slit nanochannel. Electrical potential distribution is considered without Debye-Huckel 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-Huckel 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. (c) 2022 Elsevier Ltd. All rights reserved.

引用

页数：7

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