To cite this version:Alexandre Labergue, Valérie Deprédurand, Alain Delconte, Guillaume Castanet, Fabrice Lemoine. New insight into two-color LIF thermometry applied to temperature measurements of droplets. Experiments in Fluids, Springer Verlag (Germany), 2010, 49 (2), pp.547 -556. <10.1007/s00348-010-0828-x>. New insight into two-color LIF thermometry applied to temperature measurements of dropletsAbstract When laser-induced fluorescence of droplets is used for measurements such as droplet temperature, a new dependence of the droplet size on the spectral distribution of fluorescence has been highlighted. The two-color laserinduced fluorescence technique applied to droplet temperature measurement requires a single fluorescent tracer and two spectral bands of detection for which the temperature sensitivity is different. Generally, the ratio of the intensities measured on each of the spectral bands of detection is assumed to be only temperature dependent. However, droplet dependence on diameter is also likely to influence the intensities ratio. This study provides some illustrations of the phenomenon, first on sprays with different mean statistical diameters and secondly on single droplets, for two temperature-sensitive fluorescent tracers in their solvents: sulforhodamine B dissolved in water and pyrromethene 597-8C9 dissolved in n-decane.
To cite this version:Guillaume Castanet, Alain Delconte, Fabrice Lemoine, Loïc Mees, Gèrard Gréhan. Evaluation of temperature gradients within combusting droplets in linear stream using two colors laser-induced fluorescence. Experiments in Fluids, Springer Verlag (Germany), 2005, 39 (2), pp.431 -440. 10.1007/s00348-005-0931-6. hal-01570421 ORIGINALS Guillaume Castanet AE Alain Delconte AE Fabrice Lemoine Loı¨c Mees AE Ge`rard Gre´han Evaluation of temperature gradients within combusting droplets in linear stream using two colors laser-induced fluorescence Abstract The scope of this paper concerns the heating process of fuel droplets injected in a hot gaseous environment. The two colors laser-induced fluorescence technique allows measuring the temperature distribution within a droplet by scanning the droplet volume by a sufficiently small probe volume compared to the droplet volume itself. The temperature field is reconstructed using two approaches which have been compared. One is based on a geometrical optics model and the other is based on the 3D calculation of the internal excitation field within the droplet, using the generalized LorenzMie theory. Experimental results have been obtained on a combusting monodisperse ethanol droplet stream (diameter around 200 lm).
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