Scalar interactions between parallel jets measured using a two-channel PLIF technique

A two-channel PLIF technique that simultaneously quantifies two scalar fields is presented. The technique consists of two independently operated single-color PLIF systems that synchronously image a common region. Two dyes (fluorescein sodium salt and oxazine 725) are excited by two lasers (argon-ion...

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Bibliographic Details
Published in:Experiments in fluids 2011-06, Vol.50 (6), p.1625-1632
Main Authors: Soltys, M. A., Crimaldi, J. P.
Format: Article
Language:English
Subjects:
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Exact sciences and technology
Fluid dynamics
Fluid- and Aerodynamics
Fluorescence
Fundamental areas of phenomenology (including applications)
Heat and Mass Transfer
Instrumentation for fluid dynamics
Jets
Physics
Research Article
Scalars
Sodium salts
Statistics
Turbulence
Turbulent flow
Turbulent flows, convection, and heat transfer
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Summary:A two-channel PLIF technique that simultaneously quantifies two scalar fields is presented. The technique consists of two independently operated single-color PLIF systems that synchronously image a common region. Two dyes (fluorescein sodium salt and oxazine 725) are excited by two lasers (argon-ion and krypton-ion), and the resulting fluorescence is imaged by a pair of cameras. The two-channel system is used to study mixing between two parallel jets, each transporting a different scalar species. Time-averaged and instantaneous mixing statistics are calculated and used to show the effects of turbulent structure on scalar mixing. In particular, the existence of positive spatial correlations between the two scalar fields is demonstrated in off-axis mixing regions.
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-010-1019-5