NDLI: A Quantitative Measurement of Wall Shear Stress Using Electric Capacity Sensing of Nematic Liquid Crystal Coating

Content Provider	Springer Nature Link
Author	Zhang, Songpeng Zhang, Xiangjun Tian, Yu Meng, Yonggang
Copyright Year	2013
Abstract	The measurement of wall shear stress (WSS) still remains a challenge in many fields such as fluid hydrodynamics, microfluidics, or biomechanics. The nematic liquid crystal coating (LCC) is a prospective technique to measure WSS due to its global measurement capability, high resolution, and non-intrusive nature. But its current application based on the optical observation is severely limited by the requirement for a complex system. In this paper, we invented a novel WSS-measuring technique based on the anisotropic permittivity and the Freedericksz transition of nematic LCC under shear stress. First, a quantitative model was built to describe the reorientation responses of nematic liquid crystal molecules under shear stress, and the corresponding variation in dielectric property of LCC was derived. Thus, the quantitative relationship between WSS and the electric capacity output of LCC was obtained. Then, an LCC sensor was fabricated using spin coating and microlithography to verify the engineering feasibility in WSS measurement. The experimental results of capacity variation are in good agreement with the theoretical molecular model of LCC under shear stress. The mechanism and advantages of the capacity-sensing LCC technique were discussed in view of quantitative and wide-ranged WSS measurement: easy and reversible initialization, as well as potential on-site applications.
Starting Page	247
Ending Page	253
Page Count	7
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	53
Issue Number	1
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2013-11-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Wall shear stress Liquid crystal coating Capacity sensing Anisotropic permittivity Tribology, Corrosion and Coatings Surfaces and Interfaces, Thin Films Theoretical and Applied Mechanics Physical Chemistry Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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