Abstract
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.
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References
Abramzon B, Sirignano WA (1989) Droplet vaporization model for spray combustion calculations. Int J Heat Mass Transf 32:1605–1618
Castanet G, Lebouche M, Lemoine F (2005) Heat and mass transfer of combusting monodisperse droplets in a linear stream. Int J Heat Mass Transf 48:3261–3275
Castanet G, Frackowiak B, Tropea C, Lemoine F (2011) Heat convection within evaporating droplets in strong aerodynamic interactions. Int J Heat Mass Transf 54:3267–3276
Deprédurand V, Miron P, Labergue A, Wolff M, Castanet G, Lemoine F (2008) A temperature-sensitive tracer suitable for two-colour laser-induced fluorescence thermometry applied to evaporating fuel droplets. Meas Sci Technol 19:105403
Deprédurand V, Castanet G, Lemoine F (2010) Heat and mass transfer in evaporating droplets in interaction: influence of the fuel. Int J Heat Mass Transf 53:3495–3502
Frohn A, Roth N (2000) Section 6.4.4 microexplosions. In: Dynamics of droplets. Springer, Heidelberg, pp 229
Lavieille P, Lemoine F, Lavergne G, Lebouché M (2001) Evaporating and combusting droplet temperature measurements using two-color laser-induced fluorescence. Exp Fluids 31:45–55
Lavieille P, Delconte A, Blondel D, Lebouché M, Lemoine F (2004) Non-intrusive temperature measurements using three-color laser-induced fluorescence. Exp Fluids 36:706–716
Lemoine F, Castanet G (2013) Temperature and chemical composition of droplets by optical measurement techniques: a state-of-the-art review. Exp Fluids 54:1–34
Maqua C, Castanet G, Lemoine F, Doué N, Lavergne G (2006) Temperature measurements of binary droplets using three-color laser-induced fluorescence. Exp Fluids 40:786–797
Virepinte JF, Biscos Y, Lavergne G, Magre P, Collin G (2000) A rectilinear droplet stream in combustion: droplet and gas phase properties. Combust Sci Technol 150:143–159
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Perrin, L., Castanet, G. & Lemoine, F. Characterization of the evaporation of interacting droplets using combined optical techniques. Exp Fluids 56, 29 (2015). https://doi.org/10.1007/s00348-015-1900-3
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DOI: https://doi.org/10.1007/s00348-015-1900-3