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Fast transient spray cooling of a hot thick target

Published online by Cambridge University Press:  24 October 2019

Fabian M. Tenzer Open the ORCID record for Fabian M. Tenzer [Opens in a new window] ,
Ilia V. Roisman Open the ORCID record for Ilia V. Roisman [Opens in a new window]  and
Cameron Tropea Open the ORCID record for Cameron Tropea [Opens in a new window]
Fabian M. Tenzer
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Alarich-Weiß-Straße 10, 64287 Darmstadt, Germany
Ilia V. Roisman*
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Alarich-Weiß-Straße 10, 64287 Darmstadt, Germany
Cameron Tropea
Affiliation:
Institute for Fluid Mechanics and Aerodynamics, Technische Universität Darmstadt, Alarich-Weiß-Straße 10, 64287 Darmstadt, Germany
*
†Email address for correspondence: roisman@sla.tu-darmstadt.de
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Abstract

Spray cooling of a hot target is characterized by strong heat flux and fast change of the temperature of the wall interface. The heat flux during spray cooling is determined by the instantaneous substrate temperature, which is illustrated by boiling curves. The variation of the heat flux is especially notable during different thermodynamic regimes: film, transitional and nucleate boiling. In this study transient boiling curves are obtained by measurement of the local and instantaneous heat flux produced by sprays of variable mass flux, drop diameter and impact velocity. These spray parameters are accurately characterized using a phase Doppler instrument and a patternator. The hydrodynamic phenomena of spray impact during various thermodynamic regimes are observed using a high-speed video system. A theoretical model has been developed for heat conduction in the thin expanding thermal boundary layer in the substrate. The theory is able to predict the evolution of the target temperature in time in the film boiling regime. Moreover, a remote asymptotic solution for the heat flux during the fully developed nucleate boiling regime is developed. The theoretical predictions agree very well with the experimental data for a wide range of impact parameters.

JFM classification

Drops and Bubbles: Drops Drops and Bubbles: Boiling
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 881 , 25 December 2019 , pp. 84 - 103
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Copyright
© 2019 Cambridge University Press 

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Tenzer et al. supplementary movie 1

Spray cooling regimes at different surface temperatures around the Leidenfrost point

Download Tenzer et al. supplementary movie 1(Video)
Video 10.5 MB

Tenzer et al. supplementary movie 2

Phenomena of spray impact regimes at different surface temperatures

Download Tenzer et al. supplementary movie 2(Video)
Video 10.4 MB