Abstract
Temperature sensitive fluorescent paints (TSP) provide a non-intrusive method for surface temperature measurement. The objective of this research is to identify application and operational parameters that have impact on the TSP calibration curve and demonstrate the method on a jet impingement experiment. In particular, the effects of painting process and lighting and viewing conditions are reported in this paper. TSPs are made by dissolving a polymer and fluorophore in a common solvent. The resulting liquid can be sprayed or brushed onto a surface. A calibration procedure and apparatus have been devised to calibrate the emission intensity of the fluorescent paints as a function of temperature. TSP has been calibrated between room temperature and 63°C. It is found that over this temperature range, calibration curves are within ± 0.8°C of each other irrespective of the number of paint coats (provided at least 3 coats are applied) and viewing and lighting angles. The TSP technique has been applied to a hot jet impinging on a transparent acrylic plate. The impingement side of the acrylic plate is coated with TSP that determines the instantaneous surface temperature distribution. The target plate was placed at 6 jet diameters from the nozzle. The temperature distribution obtained from the TSP clearly shows the stagnation area and flow transition of jet impingement flow.
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