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Composition measurement of bicomponent droplets using laser-induced fluorescence of acetone

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Abstract

Commercial fuels are complex mixtures, the evaporation of which remains particularly difficult to model. Experimental characterization of the differential vaporization of the components is a problem that is seldom addressed. In this paper, the evaporation of binary droplets made of ethyl-alcohol and acetone is investigated using a technique of measurement of the droplet composition developed in purpose. This technique exploits the laser induced fluorescence of acetone which acts as a fluorescent tracer as well as the more volatile component of the fuel associated with an accurate measurement of the droplet diameter by forward scattering interferometry. A model of the fluorescence intensity of the binary mixture, taking into account the absorption of the acetone molecules, is proposed and validated. The sensitivity of the technique is discussed. Finally, the reliability of the technique is demonstrated on binary combusting droplets in linear stream.

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Abbreviations

A :

Spontaneous emission Einstein coefficient

C = L/D :

Dimensionless distance parameter

D :

Droplet diameter

E 0 :

Incident laser energy

E :

Laser energy

I :

Fluorescence intensity

K opt :

Optical constant

k q :

Quenching constant

m :

imaginary refractive index

V d :

Droplet volume

t :

Time

Z :

Volume fraction

ε :

Molar extinction coefficient

χ :

Molar fraction

inj:

Injection

a:

Acetone

e:

Ethanol

l:

Local

0:

Reference measurement

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Acknowledgments

This program has been conducted in the framework of the ASTRA program, supported by CNRS and ONERA. The authors wish to thank Loic Mees and Gérard Gréhan for their help in the Generalized Lorentz-Mie Theory calculations.

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Authors and Affiliations

  1. LEMTA, Nancy-Universitè, CNRS, 2, Avenue de la forêt de Haye, BP 160, 54504, Vandoeuvre-lès-Nancy, France

    C. Maqua, V. Depredurand, G. Castanet, M. Wolff & F. Lemoine

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  1. C. Maqua
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  2. V. Depredurand
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  3. G. Castanet
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  4. M. Wolff
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  5. F. Lemoine
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Correspondence to F. Lemoine.

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Maqua, C., Depredurand, V., Castanet, G. et al. Composition measurement of bicomponent droplets using laser-induced fluorescence of acetone. Exp Fluids 43, 979–992 (2007). https://doi.org/10.1007/s00348-007-0368-1

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  • DOI: https://doi.org/10.1007/s00348-007-0368-1

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