Heating and evaporation of suspended water droplets

Experimental studies and modelling

Pavel Strizhak, Roman Volkov, Gullaume Castanet, Fabrice Lemoine , Oyuna Rybdylova, Sergei Sazhin

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The results of a series of experiments focused on investigation of the heating and evaporation of suspended water droplets in a hot air flow (at temperatures up to 800 C) are described. The temperatures inside droplets were estimated based on Planar Laser-Induced Fluorescence (PLIF) imaging. The advantages and limitations of this method are investigated. Typical distributions of temperatures inside droplets at the initial stages of their heating and evaporation are presented. These distributions at various cross-sections are compared. They are shown to be strongly inhomogeneous during the whole period of observation. A new model for heating and evaporation of a suspended droplet, taking into account temperature gradient and recirculation inside the droplet and the effect of a supporting rod, is suggested. It is assumed that the heat transferred from the rod to the suspended droplet is homogeneously distributed inside the droplet; its effect is modelled similarly to the effect of external thermal radiation, using the previously developed model for droplet heating in the presence of this radiation. It is shown that a reasonable agreement between the model predictions and experimental data can be achieved if the reduction of the ambient gas temperature due to the presence of an evaporating droplet is taken into account. The effect of the rod on droplet heating is shown to be most significant for ambient gas temperature equal to 100 C and becomes negligibly small when the gas temperature reaches 800 C.
Original languageEnglish
Pages (from-to)92-106
JournalInternational Journal of Heat and Mass Transfer
Volume127
DOIs
Publication statusPublished - 14 Jul 2018

Fingerprint

evaporation
gas temperature
heating
rods
water
ambient temperature
high temperature air
thermal radiation
air flow
laser induced fluorescence
temperature
temperature gradients
heat
cross sections
radiation
predictions

Keywords

  • Water droplets
  • Droplet heating and evaporation
  • Mathematical model
  • Model validation

Cite this

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title = "Heating and evaporation of suspended water droplets: Experimental studies and modelling",
abstract = "The results of a series of experiments focused on investigation of the heating and evaporation of suspended water droplets in a hot air flow (at temperatures up to 800 C) are described. The temperatures inside droplets were estimated based on Planar Laser-Induced Fluorescence (PLIF) imaging. The advantages and limitations of this method are investigated. Typical distributions of temperatures inside droplets at the initial stages of their heating and evaporation are presented. These distributions at various cross-sections are compared. They are shown to be strongly inhomogeneous during the whole period of observation. A new model for heating and evaporation of a suspended droplet, taking into account temperature gradient and recirculation inside the droplet and the effect of a supporting rod, is suggested. It is assumed that the heat transferred from the rod to the suspended droplet is homogeneously distributed inside the droplet; its effect is modelled similarly to the effect of external thermal radiation, using the previously developed model for droplet heating in the presence of this radiation. It is shown that a reasonable agreement between the model predictions and experimental data can be achieved if the reduction of the ambient gas temperature due to the presence of an evaporating droplet is taken into account. The effect of the rod on droplet heating is shown to be most significant for ambient gas temperature equal to 100 C and becomes negligibly small when the gas temperature reaches 800 C.",
keywords = "Water droplets, Droplet heating and evaporation, Mathematical model, Model validation",
author = "Pavel Strizhak and Roman Volkov and Gullaume Castanet and Fabrice Lemoine and Oyuna Rybdylova and Sergei Sazhin",
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language = "English",
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Heating and evaporation of suspended water droplets : Experimental studies and modelling. / Strizhak, Pavel ; Volkov, Roman; Castanet, Gullaume ; Lemoine , Fabrice; Rybdylova, Oyuna; Sazhin, Sergei.

In: International Journal of Heat and Mass Transfer, Vol. 127, 14.07.2018, p. 92-106.

Research output: Contribution to journalArticleResearchpeer-review

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T2 - Experimental studies and modelling

AU - Strizhak, Pavel

AU - Volkov, Roman

AU - Castanet, Gullaume

AU - Lemoine , Fabrice

AU - Rybdylova, Oyuna

AU - Sazhin, Sergei

PY - 2018/7/14

Y1 - 2018/7/14

N2 - The results of a series of experiments focused on investigation of the heating and evaporation of suspended water droplets in a hot air flow (at temperatures up to 800 C) are described. The temperatures inside droplets were estimated based on Planar Laser-Induced Fluorescence (PLIF) imaging. The advantages and limitations of this method are investigated. Typical distributions of temperatures inside droplets at the initial stages of their heating and evaporation are presented. These distributions at various cross-sections are compared. They are shown to be strongly inhomogeneous during the whole period of observation. A new model for heating and evaporation of a suspended droplet, taking into account temperature gradient and recirculation inside the droplet and the effect of a supporting rod, is suggested. It is assumed that the heat transferred from the rod to the suspended droplet is homogeneously distributed inside the droplet; its effect is modelled similarly to the effect of external thermal radiation, using the previously developed model for droplet heating in the presence of this radiation. It is shown that a reasonable agreement between the model predictions and experimental data can be achieved if the reduction of the ambient gas temperature due to the presence of an evaporating droplet is taken into account. The effect of the rod on droplet heating is shown to be most significant for ambient gas temperature equal to 100 C and becomes negligibly small when the gas temperature reaches 800 C.

AB - The results of a series of experiments focused on investigation of the heating and evaporation of suspended water droplets in a hot air flow (at temperatures up to 800 C) are described. The temperatures inside droplets were estimated based on Planar Laser-Induced Fluorescence (PLIF) imaging. The advantages and limitations of this method are investigated. Typical distributions of temperatures inside droplets at the initial stages of their heating and evaporation are presented. These distributions at various cross-sections are compared. They are shown to be strongly inhomogeneous during the whole period of observation. A new model for heating and evaporation of a suspended droplet, taking into account temperature gradient and recirculation inside the droplet and the effect of a supporting rod, is suggested. It is assumed that the heat transferred from the rod to the suspended droplet is homogeneously distributed inside the droplet; its effect is modelled similarly to the effect of external thermal radiation, using the previously developed model for droplet heating in the presence of this radiation. It is shown that a reasonable agreement between the model predictions and experimental data can be achieved if the reduction of the ambient gas temperature due to the presence of an evaporating droplet is taken into account. The effect of the rod on droplet heating is shown to be most significant for ambient gas temperature equal to 100 C and becomes negligibly small when the gas temperature reaches 800 C.

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