Exciplex Fluorescence Thermometry of Falling Hexadecane Droplets

[+] Author and Article Information
T. R. Hanlon, L. A. Melton

Department of Chemistry, The University of Texas at Dallas, Richardson, TX 75083

J. Heat Transfer 114(2), 450-457 (May 01, 1992) (8 pages) doi:10.1115/1.2911294 History: Received April 01, 1991; Revised November 01, 1991; Online May 23, 2008


Exciplex fluorescence thermometry has been used to measure the temperature of 283 micron hexadecane droplets falling through a quiescent, oxygen-free, approximately 500°C ambient. After a period of negligible change, the derived droplet temperatures exhibit a sharp rise of about 100°C followed by a gentle increase to approximately 200°C. The derived temperatures, although averaged over most of the volume of the droplet, still provide some evidence of internal processes in the droplet due to the partially selective optical sampling of the droplet volume, in which fluorescence from the region between 0.50 and 0.75 of the droplet radius contributes disproportionately. At longer times, the droplet is presumed to be approximately homogeneous, and the exciplex fluorescence thermometry measurements provide accurate, interpretable temperatures for the freely falling droplets.

Copyright © 1992 by The American Society of Mechanical Engineers
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