Measurement of Falling Film Thickness Around a Horizontal Tube Using a Laser Measurement Technique

A new optical method for the non-intrusive measurement of falling film thickness on the perimeter of horizontal tubes is described. The technique uses a high-speed digital video camera to capture the images of the liquid interface that are illuminated by a laser sheet, with the contrast enhanced by...

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Bibliographic Details
Published in:Heat transfer engineering 2004-12, Vol.25 (8), p.28-34
Main Authors: GSTOEHL, D., ROQUES, J. F., CRISINEL, P., THOME, J. R.
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical applications
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Heat exchangers (included heat transformers, condensers, cooling towers)
Instrumentation for fluid dynamics
Metrological applications
Optics
Physics
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Summary:A new optical method for the non-intrusive measurement of falling film thickness on the perimeter of horizontal tubes is described. The technique uses a high-speed digital video camera to capture the images of the liquid interface that are illuminated by a laser sheet, with the contrast enhanced by a fluorescent powder in the fluid. The results are compared to those predicted by the Nusselt falling film theory, showing relatively good agreement around the upper perimeter of the tube but much poorer agreement on the lower perimeter. The corresponding effects on heat transfer have also been estimated.
ISSN:0145-7632
1521-0537
DOI:10.1080/01457630490519899