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Gas-Vapor Mixture Temperature in the Near-Surface Layer of a Rapidly-Evaporating Water Droplet

Power Engineering Institute, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
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Entropy 2019, 21(8), 803; https://doi.org/10.3390/e21080803
Received: 19 July 2019 / Revised: 10 August 2019 / Accepted: 15 August 2019 / Published: 16 August 2019
Mathematical modeling of the heat and mass transfer processes in the evaporating droplet–high-temperature gas medium system is difficult due to the need to describe the dynamics of the formation of the quasi-steady temperature field of evaporating droplets, as well as of a gas-vapor buffer layer around them and in their trace during evaporation in high-temperature gas flows. We used planar laser-induced fluorescence (PLIF) and laser-induced phosphorescence (LIP). The experiments were conducted with water droplets (initial radius 1–2 mm) heated in a hot air flow (temperature 20–500 °C, velocity 0.5–6 m/s). Unsteady temperature fields of water droplets and the gas-vapor mixture around them were recorded. High inhomogeneity of temperature fields under study has been validated. To determine the temperature in the so called dead zones, we solved the problem of heat transfer, in which the temperature in boundary conditions was set on the basis of experimental values. View Full-Text
Keywords: high-temperature gases; water droplet; temperature field; vapor buffer layer; planar laser-induced fluorescence; laser-induced phosphorescence high-temperature gases; water droplet; temperature field; vapor buffer layer; planar laser-induced fluorescence; laser-induced phosphorescence
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MDPI and ACS Style

Antonov, D.; Volkov, R.; Strizhak, P. Gas-Vapor Mixture Temperature in the Near-Surface Layer of a Rapidly-Evaporating Water Droplet. Entropy 2019, 21, 803.

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