PARAMETRIC STUDIES OF MICROCHANNEL CONJUGATE LIQUID FLOWS WITH ZETA POTENTIAL EFFECTS

E. Ng, S. T. Poh
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引用次数: 3

Abstract

This paper presents a computer model with the use of a finite-volume scheme on the liquid flow and heat transfer in microchannels, with streaming potential as the driving force. The concept of electric double layer (EDL) was introduced to explain the microscale deviation. Interfacial electrokinetic phenomena such as the EDL play important roles in various transport processes in microchannels. Conventional theories of fluid mechanics and heat transfer cannot explain these phenomena observed in microchannels. The presence of the EDL reduces the liquid velocity within the microchannel, which affects the heat transfer mechanism in the pressure-driven microchannels. In this paper, a source term in the form of the electrical body force was included in the governing momentum equations for microscale computation with the effects of the heat transfer through the channel wall. The numerical parametric studies performed allowed the conclusion that the flow and heat transfer characteristics in microchannels depend on the bulk ionic concentration, the Zeta potential and the aspect ratio of the channel, which is the reflection of the EDL effects. The existing of the EDL is more significant as aspect ratios decrease. Also, the friction coefficient increases as the ionic concentration of the aqueous KCL solution decreases and the Zeta potential of the system increases. However, one should be aware that the ionic concentration of 10-8 M is unlikely in reality.
具有ζ势效应的微通道共轭液体流动的参数化研究
本文建立了以流动势为驱动力的微通道内液体流动和换热的有限体积计算模型。引入双电层(EDL)的概念来解释微尺度偏差。界面电动力学现象如EDL在微通道内的各种输运过程中起着重要的作用。传统的流体力学和传热学理论无法解释微通道中观察到的这些现象。EDL的存在降低了微通道内的液体速度,影响了压力驱动微通道内的传热机制。本文在考虑通道壁面传热影响的微尺度动量控制方程中引入了电体力形式的源项。数值参数研究表明,微通道内的流动和传热特性取决于通道的体积离子浓度、Zeta电位和宽高比,这是EDL效应的反映。随着纵横比的减小,EDL的存在更加显著。摩擦系数随KCL水溶液离子浓度的减小和体系Zeta电位的增大而增大。然而,人们应该意识到,10-8 M的离子浓度在现实中是不可能的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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