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Article

Investigation of Shear-Driven and Pressure-Driven Liquid Crystal Flow at Microscale: A Quantitative Approach for the Flow Measurement

by 1,†, 1,†, 1, 2, 3,* and 2,*
1
National Key Laboratory of Science and Technology on Aero-Thermodynamics, School of Energy and Power Engineering, Beihang University, Beijing 100083, China
2
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang, Singapore 639798, Singapore
3
Research Institute of Aero-Engine, Beihang University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
The two authors contribute equally to this work.
Micromachines 2021, 12(1), 28; https://doi.org/10.3390/mi12010028
Received: 17 September 2020 / Revised: 9 December 2020 / Accepted: 23 December 2020 / Published: 29 December 2020
(This article belongs to the Section E:Engineering and Technology)
The liquid crystal-based method is a new technology developed for flow visualizations and measurements at microscale with great potentials. It is the priority to study the flow characteristics before implementation of such a technology. A numerical analysis has been applied to solve the simplified dimensionless two-dimensional Leslie–Ericksen liquid crystal dynamic equation. This allows us to analyze the coupling effect of the LC’s director orientation and flow field. We will be discussing two classic shear flow cases at microscale, namely Couette and Poiseuille flow. In both cases, the plate drag speed in the state of Couette flow are varied as well as the pressure gradients in Poiseuille flow state are changed to study their effects on the flow field distributions. In Poiseuille flow, with the increase of applied pressure gradient, the influence of backflow significantly affects the flow field. Results show that the proposed method has great advantages on measurement near the wall boundaries which could complement to the current adopted flow measurement technique. The mathematical model proposed in this article could be of great potentials in the development of the quantitatively flow measurement technology. View Full-Text
Keywords: liquid crystal; shear flow; director field; flow measurement; flow visualization liquid crystal; shear flow; director field; flow measurement; flow visualization
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MDPI and ACS Style

Zhu, J.; Tang, R.; Chen, Y.; Yin, S.; Huang, Y.; Wong, T. Investigation of Shear-Driven and Pressure-Driven Liquid Crystal Flow at Microscale: A Quantitative Approach for the Flow Measurement. Micromachines 2021, 12, 28. https://doi.org/10.3390/mi12010028

AMA Style

Zhu J, Tang R, Chen Y, Yin S, Huang Y, Wong T. Investigation of Shear-Driven and Pressure-Driven Liquid Crystal Flow at Microscale: A Quantitative Approach for the Flow Measurement. Micromachines. 2021; 12(1):28. https://doi.org/10.3390/mi12010028

Chicago/Turabian Style

Zhu, Jianqin, Runze Tang, Yu Chen, Shuai Yin, Yi Huang, and Teckneng Wong. 2021. "Investigation of Shear-Driven and Pressure-Driven Liquid Crystal Flow at Microscale: A Quantitative Approach for the Flow Measurement" Micromachines 12, no. 1: 28. https://doi.org/10.3390/mi12010028

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