caa a22 4500 606198873 CHVBK 20210128100936.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00348-015-1900-3 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1900-3 Characterization of the evaporation of interacting droplets using combined optical techniques [Elektronische Daten] [Lionel Perrin, Guillaume Castanet, Fabrice Lemoine] A monodisperse droplet stream is injected into a high-temperature enclosure supplied with air heated up to 540°C. The two-color laser-induced fluorescence (2cLIF) is used for measuring the droplet temperature. The liquid fuel is seeded by pyrromethene 597-C8, which is a temperature-sensitive fluorescent dye. Calibration tests are performed for different types of fuels including ethanol and several alkanes and some of their mixtures. Morphology-dependent resonances (MDRs) are identified as a possible adverse effect for temperature measurements. Due to MDRs, lasing of pyrromethene 597-C8 may occur within fluorescent droplets and affect drastically the fluorescence signal upon which temperature measurement relies. The determination of the droplet size and velocity is achieved by means of quantitative shadow imaging. A double cavity PIV laser is focused on a piece of PMMA doped with a fluorescent dye to produce the background illumination of the droplets. A PIV camera is used to capture the drop motion between the pulses of the laser cavities. A large range of initial distance parameters (the ratio between the inter-droplet distance and the droplet diameter) is explored for different liquid fuels (ethanol, isohexane, n-heptane, n-decane, n-dodecane) and their mixtures. To put forward the effects of the interactions between the droplets, size and temperature measurements are compared to the isolated droplet whose evolution can be predicted with the use of classical models. Comparisons reveal that the inter-droplet spacing and also the fuel volatility play an important role in the reduction of the heat and mass transfers for these interacting droplets. Finally, the ability of the 2cLIF techniques to address the case of multicomponent droplet is also demonstrated. Springer-Verlag Berlin Heidelberg, 2015 Perrin Lionel Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut Castanet Guillaume Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut Lemoine Fabrice Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-16 0723-4864 56:2<1 2015 56 348 https://doi.org/10.1007/s00348-015-1900-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1900-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Perrin Lionel Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut NATIONALLICENCE 700 1- Castanet Guillaume Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut NATIONALLICENCE 700 1- Lemoine Fabrice Université de Lorraine, LEMTA, UMR 7563, F-54500, Vandoeuvre-Lès-Nancy, France aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-16 0723-4864 56:2<1 2015 56 348