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Evaporation of polydispersed droplets in a highly turbulent channel flow

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Abstract

A model experiment for the study of evaporating turbulent two-phase flows is presented here. The study focuses on a situation where pre-atomized and dispersed droplets vaporize and mix in a heated turbulent flow. The test bench consists in a channel flow with characteristics of homogeneous and isotropic turbulence where fluctuations levels reach very high values (25% in the established zone). An ultrasonic atomizer allows the injection of a mist of small droplets of acetone in the carrier flow. The large range diameters ensure that every kind of droplet behavior with regards to turbulence is possible. Instantaneous concentration fields of the vaporized phase are extracted from fluorescent images (PLIF) of the two phase flow. The evolution of the mixing of the acetone vapor is analyzed for two different liquid mass loadings. Despite the high turbulence levels, concentration fluctuations remain significant, indicating that air and acetone vapor are not fully mixed far from the injector.

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Abbreviations

C :

Vapor concentration (kg m−3)

C ref :

Reference concentration (kg m−3)

C vap :

Vapor mass concentration (kg m−3)

D 10 :

Mean arithmetic diameter (m)

D 32 :

Sauter mean diameter (m)

f, g :

Inter-correlation functions

F u , F v :

Longitudinal and radial components flatness factors

H :

Width of the channel cross-section (m)

L f :

Turbulence integral length scale (m)

M :

Molar mass (kg m−1)

m :

Mass (kg)

S u , S v :

Longitudinal and radial components skewness factors

St :

Stokes number

T :

Temperature (K)

U 0 :

Flowing velocity (m s−1)

U :

Longitudinal velocity (m s−1)

V :

Radial velocity (m s−1)

u, v :

Instantaneous velocities (m s−1)

u′, v′:

Turbulent velocity components (m s−1)

X :

Longitudinal location (m)

X vap :

Vapor molar fraction

Y :

Radial location (m)

y′:

Fluctuating vapor mass fraction

Y vap :

Vapor mass fraction

\( \overline{( \cdot )} \) :

Arithmetic average symbol

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Acknowledgments

The authors would like to thank F. Moreau and Dr. B. Bédat for fruitful discussions. G. Couteau, M. Marchal, E. Cid (IMFT) and P. Gicquel (ONERA) are greatly acknowledged for technical support.

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Authors and Affiliations

  1. Université de Toulouse, INPT, UPS; IMFT (Institut de Mécanique des Fluides de Toulouse), Allée Camille Soula, 31400, Toulouse, France

    M. Cochet, Rudy Bazile, B. Ferret & S. Cazin

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  1. M. Cochet
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  2. Rudy Bazile
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  3. B. Ferret
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  4. S. Cazin
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Correspondence to Rudy Bazile.

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Cochet, M., Bazile, R., Ferret, B. et al. Evaporation of polydispersed droplets in a highly turbulent channel flow. Exp Fluids 47, 379–394 (2009). https://doi.org/10.1007/s00348-009-0667-9

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  • DOI: https://doi.org/10.1007/s00348-009-0667-9

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