The Effect of Surface Films on Concentration Fluctuations Close to a Gas/Liquid Interfaceby William E. Asher, Oregon Graduate Cent, Beaverton, United States,
James F. Pankow, Oregon Graduate Cent, Beaverton, United States,
Abstract: Modeling of gas/liquid mass transport requires knowledge concerning the behavior of near-surface concentration fluctuations at clean and film-covered gas/liquid interfaces. Previous measurements of concentration fluctuations were performed with invasive sampling techniques or for water surfaces of unknown cleanliness. Here, concentration fluctuation depths were calculated from noninvasive laser-induced fluorescence measurements of surface fluorescence fluctuations for carefully cleaned and film-covered water surfaces for a range of turbulence intensities. Comparison of the film-covered water surface concentration fluctuation depths to previous measurements of concentration fluctuations shows that the calculational procedure provides accurate estimates of fluctuation depths.
Subject Headings: Water surface | Mass transport | Water quality | Turbulence | Comparative studies | Mass transfer
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