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Article Dans Une Revue Experiments in Fluids Année : 2023

Systematic error and correction of intensity-based I-PLIF for local pH and concentration measurements in unsteady boundary layers

Résumé

Planar Laser Induced Fluorescence methods, in particular in their Inhibited version (I-PLIF) are powerful tools to measure local scalar values in various types of flows. The most commonly used LIF methods are intensity-based: scalar value is extracted from fluoresced light intensity information. However such methods are prone to error when used in challenging configurations (multiphase flows, non-optically-thin systems, etc). In this short paper, the systematic error on concentration measurement in a dissolved gas boundary layer caused by scalardependency of the extinction coefficient is discussed, in the context of a non optically thin system with significant out-of-field absorption. Results of single color IpH − P LIF measurements are compared to I r pH − P LIF (ratiometric) measurements for which the out-offield absorption is intrinsically accounted for. An empirical correction based on first order concentration statistics derived from ratiometric measurements is proposed. It is used to demonstrate that the oversight of out-of-field absorption in intensity-based methods can lead to significant error on the scalar measurements inside the boundary layer.
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Dates et versions

hal-04275182 , version 1 (08-11-2023)

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Tom Lacassagne, Mahmoud El Hajem, Jean-Yves Champagne, Serge Simoëns. Systematic error and correction of intensity-based I-PLIF for local pH and concentration measurements in unsteady boundary layers. Experiments in Fluids, 2023, 64 (11), pp.184. ⟨10.1007/s00348-023-03726-4⟩. ⟨hal-04275182⟩
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