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Study of the thermal mixing between two non-isothermal sprays using combined three-color LIF thermometry and phase Doppler analyzer

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Abstract

The aim of this experimental work was to demonstrate the ability of three-color laser-induced fluorescence (3cLIF) thermometry to study the thermal mixing of two non-isothermal water sprays. Combined 3cLIF-phase Doppler analyzer measurements were also implemented to derive correlations between droplet size and temperature. Both sprays had different characteristics in terms of flow rate and droplet size distribution. The liquid spray was successively pre-heated, and the other spray was maintained and injected at ambient temperature. The thermal mixing will be discussed in light of a wide set of experimental results obtained under various experimental conditions, including different liquid flow rates, droplet size distributions and droplet concentrations. To analyze the potential effect of droplet coalescence on the mean local liquid temperature, both sprays were alternatively seeded with fluorescent dye. Main results show that significant heating of cold spray is possible when the hot spray is injected with the higher flow rate. Moreover, this heating affects only the smallest droplets.

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Authors and Affiliations

  1. LEMTA, UMR 7563, Université de Lorraine, Vandoeuvre-Lès-Nancy, 54504, France

    Alexandre Labergue, Alain Delconte & Fabrice Lemoine

  2. CNRS, LEMTA, UMR 7563, Vandoeuvre-Lès-Nancy, 54504, France

    Alexandre Labergue, Alain Delconte & Fabrice Lemoine

Authors
  1. Alexandre Labergue
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  2. Alain Delconte
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  3. Fabrice Lemoine
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Correspondence to Alexandre Labergue.

Additional information

This article is part of the Topical Collection on Application of Laser Techniques to Fluid Mechanics 2012.

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Labergue, A., Delconte, A. & Lemoine, F. Study of the thermal mixing between two non-isothermal sprays using combined three-color LIF thermometry and phase Doppler analyzer. Exp Fluids 54, 1527 (2013). https://doi.org/10.1007/s00348-013-1527-1

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  • DOI: https://doi.org/10.1007/s00348-013-1527-1

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