TECHNICAL PAPERS: Bubbles, Particles, and Droplets

Measurement of Temperatures on In-Flight Water Droplets by Laser Induced Fluorescence Thermometry

[+] Author and Article Information
V. M. Salazar

Department of Mechanical Engineering, University of Puerto Rico, Mayaguez 2, PR 00681-9045

J. E. González

Department of Mechanical Engineering, Santa Clara University, Santa Clara, CA 95053

L. A. Rivera

Department of Chemistry, University of Puerto Rico-Mayagüez, Mayaguez, PR 00681-9019

J. Heat Transfer 126(2), 279-285 (May 04, 2004) (7 pages) doi:10.1115/1.1667527 History: Received August 22, 2002; Revised December 15, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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Typical fluorescence emission spectra for an excimeric solution. In this case the solution is 5 mM pyrene in ethanol at ambient temperature.
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(Left superior corner) Atomizer and orifice plate, (Right) Schematic diagram of the experimental setup for droplet temperature measurements
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Simultaneous observation of the stream of droplets at two different wavelengths range, the monomer and the red shifted excimer in a gray false color
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Emission spectra taken in a fluorescence spectrophotometer for the water pyrene/CDBAC/water solution at 5 mM concentration of both pyrene and CBBAC, with excitation wavelength at λ=337 nm
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LIF thermometry calibration curves for a pyrene/CDBAC/water solution at 5 mM concentration from data collected at a fluorescence spectrophotometer (continuous line refers to the heating process and the dots to the cooling process), and in-situ calibration curve developed with the spray experimental setup
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Experimental temperature measurements [dots] for a single stream of in-flight water droplets (200 μm in diameter) doped with pyrene/CDBAC dye at 5 mM concentration, and a comparison with results of a theoretical model (solid lines), for initial temperatures of 30, 40, and 50°C




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