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The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development

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DOI: 10.4236/jcpt.2014.41007    3,530 Downloads   5,607 Views   Citations


Thermochromic liquid crystals (TLC) and true-colour digital image processing have been successfully used in non-intrusive technical, industrial and biomedical studies and applications. Thin coatings of TLC at surfaces are utilized to obtain detailed temperature distributions and heat transfer rates for steady or transient processes. Liquid crystals also can be used to make the temperature and velocity fields in liquids visible by the simple expedient of directly mixing the liquid crystal material into the liquid (water, glycerol, glycol, and silicone oils) in very small quantities to use as thermal and hydrodynamic tracers. In biomedical situations, e.g., skin diseases, breast cancer, blood circulation and other medical application, TLC and image processing are successfully used as an additional non-invasive diagnostic method especially useful for screening large groups of potential patients. The history of this technique is reviewed, principal methods and tools are described and some examples are presented. Also steady-state and transient liquid crystal thermography (LCT) is used to measure local heat transfer on a plate equipped with transverse vortex generators. Automated evaluation allows determining the heat transfer coefficient without arbitrary influence of human interpretation.

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J. Stasiek, M. Jewartowski and T. Aleksander Kowalewski, "The Use of Liquid Crystal Thermography in Selected Technical and Medical Applications—Recent Development," Journal of Crystallization Process and Technology, Vol. 4 No. 1, 2014, pp. 46-59. doi: 10.4236/jcpt.2014.41007.


[1] DATA TRANSLATION Ltd., “Image Processing Handbook,” 1991.
[2] M. Travis, “True-Colour Image Processing on the Desktop,” Photonics Spectra, Laurin Publishing Co., Inc., Pittsfield.
[3] J. Stasiek and M. W. Collins, “The Use of Liquid Crystals and True-Colour Image Processing in Heat and Fluid Flow Experiments,” Atlas of Visualization, Vol. 2, CRC Press, Inc., New York, 1996.
[4] J. Stasiek, G. Tanda and M. Ciofalo, “Heat Transfer Measurement in Heat Exchangers by Liquid Crystal Thermography,” Euromech406 Colloquium, Warsaw, 6-8 May 1999, Book of Abstracts IPPT PAN.
[5] J. Stasiek, A. Stasiek, M. Jewartowski and M. W. Collins, “Liquid Crystal Thermography and True-Colour Digital Image Processing,” Optics & Laser Technology, Vol. 38, No. 4, 2006, pp. 243-256.
[6] M. Parsley, “The Use of Thermochrome Crystals in Heat Transfer and Fluid Flow Visualization Research,” FLUCOME’88, Sheffield University, 5-9 September 1988, pp. 216-220.
[7] R. Reinitzer, “Beitrage zur Kenntniss des Cholestrins,” Monatschefte für Chemie, Vol. 9, 1888, pp. 421-441.
[8] W. J. Hiller, St. Koch, T. A. Kowalewski and F. Stella, “Onset of Natural Convection in a Cube,” International Journal of Heat and Mass Transfer, Vol. 36, No. 13, 1993, pp. 3251-3263.
[9] J. A. Stasiek and T. A. Kowalewski, “Thermocromic Liquid Crystals Applied for Heat Transfer Research,” Opto-Electronics Review, Vol. 10, No. 1, 2002, pp. 1-10.
[10] T. A. Kowalewski, A. Cybulski and M. Rebow, “Particle Image Velocimetry and Thermometry in Freezing Water,” G. M. Carlomagno and I. Grant, Eds., 8th International Symposium on Flow Visualization, Sorrento, 1-4 September 1998, pp. 24.1-24.8.
[11] T. A. Kowalewski and M. Rebow, “Freezing of Water in the Differentially Heated Cubic Cavity,” International Journal of Computational Fluid Dynamics, Vol. 11, No. 3-4, 1999, pp. 193-210.
[12] N. Akino, T. Kunugi, Y. Shiina, K. Ichimiya and A. Kurosawa, “Fundamental Study on Visualization of Temperature Fields Using Thermosensitive Liquid Crystals,” In: R. Reznicek, Ed., Flow Visualization V, Hemisphere Publishing Corp., Washington DC, 1990, pp. 87-92.
[13] J. Stasiek, “Thermochromic Liquid Crystals and True Colour Image Processing in Heat Transfer and Fluid Flow Research,” Journal of Heat and Mass Transfer, Vol. 33, No. 1-2, 1997, pp. 27-29.
[14] A. Stasiek, “Heat Transfer Enhanced in a Rectangular Channel with Varying Number of Ribbed Walls,” Ph.D. Thesis, Technical University of Koszalin, Koszalin, 2008.
[15] J. W. Baughn and X. Yan, “Liquid Crystal Methods in Experimental Heat Transfer,” Proceedings of 32nd Heat Transfer and Fluid, Mechanics Institute Sacramento, California, 1991, pp. 15-40.
[16] R. J. Moffat, “Describing the Uncertainties in Experimental Results,” Experimental Thermal and Fluid Sciences, Vol. 1, No. 1, 1988, pp. 3-17.
[17] R. J. Moffat, “Experimental Heat Transfer,” Proceedings of 9th International Heat Transfer Conference, Jerusalem, Vol. 1, 1991, pp. 308-310.
[18] T. V. Jones, Z. Wang and P. T. Ireland, “The Use of Liquid Crystals in Aerodynamic and Heat Transfer Experiments,” Proceedings of 1st ImechE Seminar on Optical Methods and Data Processing in Heat and Fluid Flow, London, 1992, pp. 51-65.
[19] S. Ashforth-Frost, L. S. Wang, K. Jambunathan, D. P. Graham and J. M. Rhine, “Application of Image Processing to Liquid Crystal Thermography,” Proceedings of 1st ImechE Seminar on Optical Methods and Data Processing in Heat and Fluid Flow, London, 1992, pp. 121-126.
[20] W. Leiner, K. Schulz, M. Behle and S. Lorenz, “Imaging Techniques to Measure Local Heat and Mass Transfer,” Proceedings of 3rd IMechE Seminar Optical Methods and Data Processing in Heat and Fluid Flow, London, 1996, pp. 1-13.
[21] T. A. Kowalewski, P. Ligrani, A. Dreizler, C. Schulz and U. Fey, “Temperature and Heat Flux: Thermochromic Liquid Crystals,” In: C. Tropea, A. L. Yarin and J. F. Foss, Eds., Springer Handbook of Experimental Fluid Mechanics, Springer, Berlin, 2007, pp. 487-500.
[22] A. Jung and J. Zuber, “Thermographic Metohds in Medical Diagnostics,” Medpress, Warsaw, 1998 (in Polish).
[23] S. Klosowicz, E. Nowinowski-Kruszelnicki and J. Zmija, “The Simple Method to Prepare Polymer Dispersed Liquid Crystals,” Molecular Crystals and Liquid Crystals, Vol. 215, No. 1, 1992, pp. 253-255 (in Polish).
[24] J. Zmija, S. Klosowicz and S. Borys, “Cholesteric Liquid Crystals in a Detection of Radiation,” WNT, Warsaw, 1989 (in Polish).
[25] MINCO Products, Inc., Minnesota, USA, 2006.
[26] MERCK Ltd., “Thermochromic Liquid Crystals,” Poole, 2006.
[27] D. Mikielewicz, A. Stasiek, M. Jewartowski and J. Stasiek, “Measurements of Heat Transfer Enhanced by the Use of Transverse Vortex Generators,” Applied Thermal Engineering, Vol. 49, 2012, pp. 61-72.
[28] G. Tanda, “Heat Transfer, Pressure, Drop in a Rectangular Channel with Diamond-Shaped Elements,” International Journal of Heat and Mass Transfer, Vol. 44, No. 18, 2001, pp. 3529-3541.
[29] G. Tanda, “Heat Transfer in Rectangular Channels with Transverse and V-Shaped Broken Ribs,” International Journal of Heat and Mass Transfer, Vol. 47, No. 2, 2004, pp. 229-243.

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