Measurement of the temperature distribution within monodisperse combusting droplets in linear streams using two-color laser-induced fluorescence

Abstract

. Measurement of the temperature distribution within monodisperse combusting droplets in linear streams using two-color laserinduced fluorescence.

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

“…2 Overview of the two-colors LIF thermometry 2.1 Principles of the two-colors LIF thermometry A comprehensive survey of the technique can be found in previous publications (Castanet et al 2003;Lavieille et al 2001). The liquid is preliminary seeded by a low concentration of a fluorescent tracer (sulforhodamine B also named Kiton red in the present case), which is temperature sensitive.…”

“…In principles, the ratio of the fluorescence signal measured on two spectral bands depends exclusively on the temperature; parameters like the tracer concentration, the probe volume, and the laser power density are eliminated in the ratio. The technique was successfully applied to measure the temperature of single evaporating or combusting droplets (Lavieille et al 2001;Castanet et al 2003), but its extension in sprays is not straightforward. In a recent paper, Labergue et al (2010) pointed out that the spectral distribution of the detected fluorescence intensity was modified in a spray compared to a cell.…”

“…These parameters are, therefore, constant during the measurements. The function f i (T) describes the temperature dependence of the fluorescence on the spectral band i and it can be generally approximated by (Castanet et al 2003):…”

A Review of Experimental Techniques for Measuring Micro- to Nano-Particle-Laden Gas Flows

“…Recently, scattering intensity measurements combined with laser or fluorescence illumination have extended the particle characteristics able to be detected in this technique, e.g., particle velocity [34,35], temperature [36,37] and chemical species [38]. It is used not only to detect micro-or larger particles, but also to measure nano-particle concentrations, e.g., in condensation particle counters, and a practical result obtained using this technique is shown in Figure 8b.…”

“…Some of the excited molecules return to the ground state by emitting fluorescence. As one of the most important inelastic scattering techniques, laser-induced fluorescence (LIF) is also used to measure particle temperature [36] and composition [38]. The basic principle behind such techniques rests on the temperature or molar fraction dependence of the fluorescence quantum yield.…”