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research-article

The effects of finite ionic sizes and wall slip on entropy generation in electroosmotic flows in a soft nanochannel

[+] Author and Article Information
Yongbo Liu

School of Mathematical Science, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China
liuyb@mail.imu.edu.cn

Yongjun Jian

School of Mathematical Science, Inner Mongolia University, Hohhot, Inner Mongolia 010021, PR China
jianyj@imu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4044414 History: Received November 29, 2018; Revised July 18, 2019

Abstract

By considering the combined effects of finite ionic sizes and boundary slip, the entropy generation analysis of mixed pressure driven and electroosmotic flows in a soft nanochannel is investigated in this study. The soft nanochannel is represented by a rigid nanochannel covered by a charged polyelectrolyte layer on its surface. The entropy generation analysis of electroosmotic flow in such a soft nanochannel is addressed for the first time. Under the high zeta potential condition, the electric potential, velocity and temperature distributions are solved numerically using the finite difference method. Subsequently, the thermal transport characteristic and entropy generation analysis are discussed based on the obtained velocity and temperature distributions. Results show that the soft nanochannel in the present model is not appropriate for cooling purposes. We also demonstrate that the steric factor v and polyelectrolyte layer thickness d can enhance the entropy generation rate. However, the slip boundary coefficient ?, drag parameter ? and equivalent electric double layer thickness ?FCL can restrain the entropy generation rate. In addition, the contribution of Joule heating and viscous friction in the entropy generation rate is more prominent than the contribution due to heat transfer. The present theoretical research can be used to design the efficient thermofluidic devices.

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