Hysteresis in Liquid Crystal Thermography-Reference-Cited by-同舟云学术

Hysteresis in Liquid Crystal Thermography

Published:2004-06-01 Issue:3 Volume:126 Page:339-346
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Anderson M. R.¹,Baughn J. W.²

Affiliation:

1. GE Optimization Services, 1631 Bently Parkway South, Minden NV 89423

2. Department of Mechanical and Aeronautical Engineering, University of California, Davis, One Shields Avenue, Davis CA 95616

Abstract

Hysteresis in five different Thermochromic Liquid Crystals (TLCs), both narrow-band and broad-band, has been investigated. All were found to exhibit a similar hysteresis behavior during cooling relative to heating. This hysteresis is characterized by a decrease in reflectivity and a shift in the temperature associated with the peak reflected intensity for each of the R, G, and B components during cooling. This causes a shift in the hue-temperature calibration of the TLC causing temperature biases, when cooled rather than heated, of 20–60% of the useful calibration range. The hysteresis effect increases as the peak temperature during a heating and cooling cycle is increased. Repeatable heating calibrations were obtained when the TLC was cooled below the red start temperature to an apparent low reset temperature. Somewhat repeatable cooling calibrations, different from the heating calibrations, were obtained when the TLC was heated somewhat above the blue stop temperature. A possible explanation of the hysteresis based on the texture of the liquid crystal helices is provided. In addition to hysteresis, a permanent decrease in reflectivity and a shift in the temperature associated with the peak reflected intensity was observed when the TLCs were exposed to extended higher temperatures (60°C–80°C).

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/126/3/339/5790664/339_1.pdf

Reference34 articles.

1. Moffat, R. J., 1990, “Experimental Heat Transfer,” Proc. 9th Int. Heat Transfer Conference, Vol. 1, pp. 187–205.

2. Jones, T. V., 1992, “The Use of Liquid Crystals in Aerodynamic and Heat Transfer Testing,” Transport Phenomena in Heat and Mass Transfer, Proceedings of the Fourth International Symposium on Transport Phenomena in Heat and Mass Transfer (ISTP-IV), Elsevier, pp. 1242–1273.

3. Cooper, T. E., Field, R. J., and Meyer, R. J., 1975, “Liquid-Crystal Thermometry and Its Application to the Study of Convective Heat Transfer,” ASME J. Heat Transfer, 97, pp. 442–450.

4. Hippensteele, S. A., Russell, L. M., and Torres, F. J., 1986, “Use of a Liquid-Crystal and Heater-Element Composite for Quantitative, High-Resolution Heat-Transfer Coefficients on a Turbine Airfoil Including Turbulence and Surface-Roughness Effects,” Winter Annual Meeting of the American Society of Mechanical Engineers, Anaheim, CA., Dec. 7–12, pp. 105–120.

5. Baughn, J. W. , 1995, “Liquid Crystal Methods for Studying Turbulent Heat Transfer,” Int. J. Heat Fluid Flow, 16(5), pp. 365–375.

Cited by 27 articles. 订阅此论文施引文献订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献

1. Nematic phases from nearly spherical mesogens: applying the approximate non-conformal (ANC) theory;Molecular Physics;2023-11-02

2. An alternative post-processing of transient liquid crystal experiments using the wall temperature gradient time response;Journal of Physics: Conference Series;2023-05-01

3. Highly sensitive lock-in thermoreflectance temperature measurement using thermochromic liquid crystal;Applied Physics Letters;2023-04-24

4. Thermotropic Liquid Crystals for Temperature Mapping;Frontiers in Bioengineering and Biotechnology;2022-05-12

5. Validation of the Transient Liquid Crystal Thermography Technique for Heat Transfer Measurements on a Rotating Cooling Passage;Energies;2020-09-11