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Unusual Optical Techniques in Diffusivity Measurements

[+] Author Affiliations
Domenica Paoletti, Dario Ambrosini

University of L’Aquila, L’Aquila, Italy

Nasser Rashidnia, Ramaswamy Balasubramaniam

NASA Glenn Research Center, Cleveland, OH

Paper No. ESDA2006-95678, pp. 787-794; 8 pages
  • ASME 8th Biennial Conference on Engineering Systems Design and Analysis
  • Volume 2: Automotive Systems, Bioengineering and Biomedical Technology, Fluids Engineering, Maintenance Engineering and Non-Destructive Evaluation, and Nanotechnology
  • Torino, Italy, July 4–7, 2006
  • ISBN: 0-7918-4249-5 | eISBN: 0-7918-3779-3
  • Copyright © 2006 by ASME


In studying hydrodynamic instabilities between two miscible fluid mixtures one often faces the problem of assigning a reliable value to diffusion coefficients. As for diffusion between two binary mixtures such as water and glycerin, water and salt, etc., no complete data are available in the literature. This shortage of data justifies the search for simple and accurate experimental techniques. Optical techniques are now recognized as powerful tools to investigate fluid flow phenomena in transparent media. In particular, in this paper we discuss three different, recently proposed, optical techniques for diffusivity measurements, namely speckle decorrelation, common path shearing interferometry and digital moiré. Although all these techniques depend on variation of the index of refraction in a transparent fluid, each method involves the use of specific instrumentation, with experimental uncertainties and ranges of applicability which differ from case to case. A comparison of the techniques is presented as well as a discussion of their possible integration.

Copyright © 2006 by ASME
Topics: Measurement



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