Combined PDA and LIF applied to size–temperature correlations measurements in a heated spray

Study of the droplet size effect coupled with the laser light scattering in sprays for two-color LIF thermometry measurements

“…The measurement protocol and optical requirements are similar to those implemented by Depredurand et al (2011). The combined 2cLIF/PDA system provides two data files recorded with the same time base, one corresponding to the droplet diameters measured by the PDA and the other one to the fluorescence intensities of the 2cLIF detection bands.…”

“…Depredurand et al (2011) recently described this coupling that allows obtaining correlations between the size and the temperature of the droplets by synchronizing the size measurements by PDA and the droplet temperature measurements by 2cLIF. The aim of the present study is to investigate how these combined measurements are affected by the spray density and the polydispersion of the droplets in size, given the effect of the droplet size on the fluorescence and the depth of field of the receiving optics.…”

“…Heat and mass transfer between droplets and gas in sprays are central in many engineering applications like internal combustion engines (Sazhin 2006;Maqua et al 2008;Depredurand et al 2011), spray cooling of hot surfaces (Castanet et al 2009;Bernardin et al 1997), or spray drying. The optimization of these applications requires advanced physical models, and the temperature of the liquid phase is one of the most relevant parameters for the assessment of these models, although its measurement remains quite difficult.…”

Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review

“…18 Two-color laserinduced fluorescence optical system. Reprinted from Depredurand et al (2011) publications. Bruchhausen et al (2004) were the first to adapt the single-dye ratiometric approach using two cameras mounted behind a beam splitter to obtain two images of the same view at different wavelengths, in the case of an overheated turbulent jet.…”

“…The droplet temperature was characterized for many liquids in situations including droplet heating in flames (Castanet et al 2005b, c;Lavieille et al 2001), droplet heating in a hot air stream Deprédurand et al 2010), droplet heating in the thermal boundary layer of a hot wall (Castanet et al 2002), droplet heating when colliding with a hot wall (Castanet et al 2009) and droplet cooling in ambient air (Lavieille et al 2000. The same method was used to measure the liquid temperature in a spray of decane droplets convected in an overheated turbulent gas flow (Depredurand et al 2011) and in a high-pressure diesel spray ). In the latter study, the signal acquisition was triggered on the injection cycle to enable phase-locked monitoring of the liquid phase temperature.…”