This work presents the use of laser induced fluorescence for instantaneous temperature measurements of 200 μm water droplets in a monodisperse stream while traveling downward in a standard stagnant atmosphere. The droplets are doped with small concentrations of a natural fluorescence dye (Pyrene), and with a surfactant substance, cetyldimetylbenzylammoniumchloride (CDBAC) to improve the fluorescence emission and the rate of its two band emission (excimer to monomer) is used to determine the temperature. The temperature distribution along the stream of droplets was determined for three different initial temperatures: 30°C, 40°C, and 50°C at the exit of the nozzle and it is compared very favorably with numerical results.
Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division August 22, 2002; revision received December 15, 2003. Associate Editor: K. D. Kihm.
Salazar, V. M., Gonza´lez, J. E., and Rivera, L. A. (May 4, 2004). "Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry ." ASME. J. Heat Transfer. April 2004; 126(2): 279–285. https://doi.org/10.1115/1.1667527
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