A Fluorescence Technique to Measure Concentration Gradients near an Interface

by Leslie M. Wolff, Univ of Illinois, Urbana, United States,
Zi-Chao Liu, Univ of Illinois, Urbana, United States,
Thomas J. Hanratty, Univ of Illinois, Urbana, United States,

Document Type: Proceeding Paper

Part of: Air-Water Mass Transfer

Abstract: A new fluorescence technique which measures the concentration profile in a mass transfer boundary layer is described. It uses a tracer whose fluorescent intensity is inversely proportional to oxygen concentration. The fluorescence of the tracer is recorded using a CCD camera so that spatial resolution is preserved. Preliminary experiments give the change in the concentration profile as oxygen diffuses into water. Comparison with calculated mass transfer rates verifies that the technique accurately measures the spatial variation of oxygen in a direction normal to the boundary.

Subject Headings: Mass transfer | Boundary layers | Probe instruments | Oxygen | Diffusion | Oxygen transfer | Cameras | Comparative studies

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