대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제24권2호
  • /
  • Pages.188-194
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  • 2000
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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측정각도를 고려한 액정교정기법의 개선

Improvement of Calibration Method of Thermochromic Liquid Crystal Reflecting Measurement Angle

  • 윤순현 (부산대학교 기계공학부) ;
  • 심재경 (부산대학교 대학원 기계공학과) ;
  • 우창수 (부산대학교 대학원 기계공학과)
  • 발행 : 2000.02.01
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초록

Thermochromic liquid crystal reflect a unique color at even temperature. Therefore, they have been successfully applied to non-intrusive heat transfer research. Hue capturing method is widely used in the quantitative measurement from the TLC image. However it is affected by several measurement conditions. The distances of camera and light source have little influence on the color, but the value of hue is seriously affected by the measurement angle. In this study, the hue capturing method is improved by considering the effect of measurement angle. This improved calibration method can diminish the misreading of temperature caused by curvature of test surface.

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참고문헌

  1. Klein, E.J., 1968, 'Application of Liquid Crystals to Boundary-layer Flow Visualizations,' AIAA Paper, No. 68-376, AIAA Third Aerodynamic Testing Conference
  2. Hippensteele, S.A., Russel, L.M., Torres, F.J., 1985, 'Local Heat Transfer Measurements on a Large Scale-Model Turbine Blade Airfoil Using a Composite of a Heater Element and Liquid Crystals,' Trans. of the ASME Journal of Engineering for Gas Turbines and Power, Vol. 107, pp. 953-960
  3. Goldstein, R.J., Franchett, M.E., 1988, 'Heat Transfer From a Flat Surface to an Oblique Impinging Jet,' Trans. of the ASME Journal of Heat Transfer, Vol. 110, pp. 84-90
  4. Akino, N., Kunugi, T., Ichimiya, K., Mitsushiro, K., Ueda, M,, 1989, 'Improved Liquid-Crystal Thermometry Excluding Human Color Sensation,' Trans. of the ASME Journal of Heat Transfer, Vol. 111, pp. 558-565
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  7. Camci, C., Kim, K., Hippensteele, S.A., Poinsatte, P.E., 1993, 'Evaluation of a Hue Capturing based Transient Liquid Crystal Method for High-Resolution Mapping of Convective Heat Transfer on Curved Surfaces,' ASME Journal of Heat Transfer, Vol. 115, pp. 311-318
  8. 김예용, 1995, '액정을 이용한 열전달 측정방법에서의 측정오차를 줄이기 위한 연구,' 부산대학교 대학원 석사학위논문
  9. Yoon, S. H., Kim, M. K. and Lee, D. H., 1997, 'Turbulent Flow and Heat transfer Characteristics of a Two-dimensional Oblique Plate Impinging Jet,' Int. J. KSME, Vol. 11, No. 4, pp. 476-483