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Use of caged fluorescent dyes for the study of turbulent passive scalar mixing

✍ Scribed by J. E. Guilkey; K. R. Gee; P. A. McMurtry; J. C. Klewicki

Publisher
Springer
Year
1996
Tongue
English
Weight
576 KB
Volume
21
Category
Article
ISSN
0723-4864

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✦ Synopsis

The non-intrusive initialization of a flow field with distinct and spatially segregated scalar components represents a significant experimental difficulty. Here a new technique is described which makes possible the non-intrusive initialization of a spatially binary passive scalar field in a laminar or turbulent flow field. This technique uses photoactivatable (caged) fluorescent dyes dissolved in the flow medium. The scalar field within the flow field is tagged or initialized by "uncaging" the appropriate regions with an ultraviolet excimer laser. Mixing between the tagged and untagged regions is quantified using standard laser induced fluorescence techniques. The method is currently being used to study mixing in a turbulent pipe flow.

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