A Liquid Crystal Scanning Thermography (LCST) technique is developed and implemented to visualize and measure three-dimensional temperature fields. Results are reported for natural convection in a differentially heated vertical cavity. Experiments are conducted under steady state conditions at Rayleigh numbers of about with glycerin as the working fluid. The scanning arrangement is described in detail together with the calibration scheme, and image processing routines that enable the processing of the thermographs and extraction of quantitative temperature information from them, including local and global heat transfer rates. The resultant temperature fields and Nusselt number values are computed and validated against both standard empirical relations and numerical predictions. To date, LCT has not been used to determine Nusselt number for enclosed fluid systems. The ability of LCST to perform this task makes this novel experimental technique a useful tool.
Three-Dimensional Visualization and Measurement of Temperature Field Using Liquid Crystal Scanning Thermography
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division Feb. 1, 2000; revision received Jan. 8, 2001. Associate Editor: D. Poulikakos.
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Lutjen, P. M., Mishra , D., and Prasad, V. (January 8, 2001). "Three-Dimensional Visualization and Measurement of Temperature Field Using Liquid Crystal Scanning Thermography ." ASME. J. Heat Transfer. October 2001; 123(5): 1006–1014. https://doi.org/10.1115/1.1370514
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