Heat exchange of an evaporating water droplet in a high-temperature environment

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Abstract

In this research, we present the results of experiments capturing the characteristics of high-temperature heating and evaporation of water droplets. The experimental parameters are as follows: initial droplet radius 1–2.5 mm, temperature 20–1100 °C, air flow velocity 0–5 m/s. We use two schemes of water droplet fixation in the heated air flow. In the experiments, we record the heating and evaporation of free-falling droplets so that the holder does not interfere with the experimental results. Typical water droplet heating rates range from 0.4 to 92.4 °C/s and evaporation rates from 0.003 to 0.178 kg/(m2s). Criterial processing of our experimental data is based on the classical equations formulated by Ranz and Marshall and equations proposed by a set of research groups and scientists. We determine the variation ranges of the Reynolds numbers, in which one can only use a limited set of Nu(Re,Pr) correlations. Adjustment coefficients are proposed to take into account the droplet surface temperatures and evaporation rates as functions of the gas medium temperature. Finally, we hypothesize as to how modern mathematical models can be modified to bring the simulation results closer to the experimental data in droplet heating and evaporation rates during fast heat supply.

Original languageEnglish
Article number106227
JournalInternational Journal of Thermal Sciences
Volume150
DOIs
Publication statusPublished - Apr 2020

Fingerprint

high temperature environments
evaporation rate
heat
Evaporation
air flow
water
heating
Water
water heating
evaporation
Temperature
Heating
holders
falling
surface temperature
Reynolds number
mathematical models
flow velocity
adjusting
radii

Keywords

  • Convective heat exchange
  • Droplet temperature field
  • Evaporation rates
  • Heating rates
  • High-temperature heating
  • Water droplets

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

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title = "Heat exchange of an evaporating water droplet in a high-temperature environment",
abstract = "In this research, we present the results of experiments capturing the characteristics of high-temperature heating and evaporation of water droplets. The experimental parameters are as follows: initial droplet radius 1–2.5 mm, temperature 20–1100 °C, air flow velocity 0–5 m/s. We use two schemes of water droplet fixation in the heated air flow. In the experiments, we record the heating and evaporation of free-falling droplets so that the holder does not interfere with the experimental results. Typical water droplet heating rates range from 0.4 to 92.4 °C/s and evaporation rates from 0.003 to 0.178 kg/(m2s). Criterial processing of our experimental data is based on the classical equations formulated by Ranz and Marshall and equations proposed by a set of research groups and scientists. We determine the variation ranges of the Reynolds numbers, in which one can only use a limited set of Nu(Re,Pr) correlations. Adjustment coefficients are proposed to take into account the droplet surface temperatures and evaporation rates as functions of the gas medium temperature. Finally, we hypothesize as to how modern mathematical models can be modified to bring the simulation results closer to the experimental data in droplet heating and evaporation rates during fast heat supply.",
keywords = "Convective heat exchange, Droplet temperature field, Evaporation rates, Heating rates, High-temperature heating, Water droplets",
author = "Kuznetsov, {G. V.} and Strizhak, {P. A.} and Volkov, {R. S.}",
year = "2020",
month = "4",
doi = "10.1016/j.ijthermalsci.2019.106227",
language = "English",
volume = "150",
journal = "International Journal of Thermal Sciences",
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AU - Kuznetsov, G. V.

AU - Strizhak, P. A.

AU - Volkov, R. S.

PY - 2020/4

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N2 - In this research, we present the results of experiments capturing the characteristics of high-temperature heating and evaporation of water droplets. The experimental parameters are as follows: initial droplet radius 1–2.5 mm, temperature 20–1100 °C, air flow velocity 0–5 m/s. We use two schemes of water droplet fixation in the heated air flow. In the experiments, we record the heating and evaporation of free-falling droplets so that the holder does not interfere with the experimental results. Typical water droplet heating rates range from 0.4 to 92.4 °C/s and evaporation rates from 0.003 to 0.178 kg/(m2s). Criterial processing of our experimental data is based on the classical equations formulated by Ranz and Marshall and equations proposed by a set of research groups and scientists. We determine the variation ranges of the Reynolds numbers, in which one can only use a limited set of Nu(Re,Pr) correlations. Adjustment coefficients are proposed to take into account the droplet surface temperatures and evaporation rates as functions of the gas medium temperature. Finally, we hypothesize as to how modern mathematical models can be modified to bring the simulation results closer to the experimental data in droplet heating and evaporation rates during fast heat supply.

AB - In this research, we present the results of experiments capturing the characteristics of high-temperature heating and evaporation of water droplets. The experimental parameters are as follows: initial droplet radius 1–2.5 mm, temperature 20–1100 °C, air flow velocity 0–5 m/s. We use two schemes of water droplet fixation in the heated air flow. In the experiments, we record the heating and evaporation of free-falling droplets so that the holder does not interfere with the experimental results. Typical water droplet heating rates range from 0.4 to 92.4 °C/s and evaporation rates from 0.003 to 0.178 kg/(m2s). Criterial processing of our experimental data is based on the classical equations formulated by Ranz and Marshall and equations proposed by a set of research groups and scientists. We determine the variation ranges of the Reynolds numbers, in which one can only use a limited set of Nu(Re,Pr) correlations. Adjustment coefficients are proposed to take into account the droplet surface temperatures and evaporation rates as functions of the gas medium temperature. Finally, we hypothesize as to how modern mathematical models can be modified to bring the simulation results closer to the experimental data in droplet heating and evaporation rates during fast heat supply.

KW - Convective heat exchange

KW - Droplet temperature field

KW - Evaporation rates

KW - Heating rates

KW - High-temperature heating

KW - Water droplets

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