Vaporization of water droplets with non-metallic inclusions of different sizes in a high-temperature gas

Jean Claude Legros, Olga Lutoshkina, Maxim Piskunov

Результат исследований: Материалы для журналаСтатья

5 Цитирования (Scopus)

Выдержка

Experimental research on mechanisms of vapor production by boiling and evaporation was carried out on heterogeneous droplets of water containing graphite particles of different sizes and concentrations, heated by high-temperature environment (up to about 1373 K). Different steps have been observed, such as free surface evaporation of the droplet, bubbles boiling at the solid inclusion/liquid interface, the explosive disintegration of a drop into a cluster of small droplets and efficient evaporation of the produced smaller droplets. We proposed the conditions for the appearance of this explosive breakup of droplets. The present paper reports that the addition of small graphite particles into heterogeneous droplets can reduce their lifetimes by about 50% in this type of high-temperature environment. Moreover, this facilitated the explosive breakup of droplets, allowing intense vaporization. This behavior led us to make the hypothesis that an insulating layer of vapor appears at the outside droplet surface and at the interface between the solid inclusions and the droplet. Measurements on the explosive breakup of heterogeneous water droplets have allowed establishing an increase of the evaporation surface area by almost fifteen times, as compared to the initial surface of droplets. However, when using graphite suspension, the measured increase of the evaporation surface was not larger than threefold. The evaporation surface area during the explosive breakup of water-graphite suspensions was 5.4 smaller as compared to water without impurities. We reported on the reasons for the above differences. The results are useful for developing technologies of fire extinguishing by using water sprays containing non-metallic solids. Practical implementation of the explosive breakup of heterogeneous droplets can eventually permit extinguishing fire on larger areas with an identical water load.

Язык оригиналаАнглийский
Страницы (с-по)360-372
Число страниц13
ЖурналInternational Journal of Thermal Sciences
Том127
DOI
СостояниеОпубликовано - 1 мая 2018

Отпечаток

high temperature gases
Vaporization
evaporation
inclusions
graphite
Gases
extinguishing
water
high temperature environments
Water
Evaporation
boiling
Temperature
Graphite
vapors
disintegration
sprayers
Boiling liquids
bubbles
Fires

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Цитировать

Vaporization of water droplets with non-metallic inclusions of different sizes in a high-temperature gas. / Legros, Jean Claude; Lutoshkina, Olga; Piskunov, Maxim.

В: International Journal of Thermal Sciences, Том 127, 01.05.2018, стр. 360-372.

Результат исследований: Материалы для журналаСтатья

@article{8eaba78295ae442898d6b5d6b27e4cb9,
title = "Vaporization of water droplets with non-metallic inclusions of different sizes in a high-temperature gas",
abstract = "Experimental research on mechanisms of vapor production by boiling and evaporation was carried out on heterogeneous droplets of water containing graphite particles of different sizes and concentrations, heated by high-temperature environment (up to about 1373 K). Different steps have been observed, such as free surface evaporation of the droplet, bubbles boiling at the solid inclusion/liquid interface, the explosive disintegration of a drop into a cluster of small droplets and efficient evaporation of the produced smaller droplets. We proposed the conditions for the appearance of this explosive breakup of droplets. The present paper reports that the addition of small graphite particles into heterogeneous droplets can reduce their lifetimes by about 50{\%} in this type of high-temperature environment. Moreover, this facilitated the explosive breakup of droplets, allowing intense vaporization. This behavior led us to make the hypothesis that an insulating layer of vapor appears at the outside droplet surface and at the interface between the solid inclusions and the droplet. Measurements on the explosive breakup of heterogeneous water droplets have allowed establishing an increase of the evaporation surface area by almost fifteen times, as compared to the initial surface of droplets. However, when using graphite suspension, the measured increase of the evaporation surface was not larger than threefold. The evaporation surface area during the explosive breakup of water-graphite suspensions was 5.4 smaller as compared to water without impurities. We reported on the reasons for the above differences. The results are useful for developing technologies of fire extinguishing by using water sprays containing non-metallic solids. Practical implementation of the explosive breakup of heterogeneous droplets can eventually permit extinguishing fire on larger areas with an identical water load.",
keywords = "Boiling, Evaporation, Fluid, Graphite, Phase transformation, Solids, Water droplet",
author = "Legros, {Jean Claude} and Olga Lutoshkina and Maxim Piskunov",
year = "2018",
month = "5",
day = "1",
doi = "10.1016/j.ijthermalsci.2018.02.011",
language = "English",
volume = "127",
pages = "360--372",
journal = "International Journal of Thermal Sciences",
issn = "1290-0729",
publisher = "Elsevier Masson SAS",

}

TY - JOUR

T1 - Vaporization of water droplets with non-metallic inclusions of different sizes in a high-temperature gas

AU - Legros, Jean Claude

AU - Lutoshkina, Olga

AU - Piskunov, Maxim

PY - 2018/5/1

Y1 - 2018/5/1

N2 - Experimental research on mechanisms of vapor production by boiling and evaporation was carried out on heterogeneous droplets of water containing graphite particles of different sizes and concentrations, heated by high-temperature environment (up to about 1373 K). Different steps have been observed, such as free surface evaporation of the droplet, bubbles boiling at the solid inclusion/liquid interface, the explosive disintegration of a drop into a cluster of small droplets and efficient evaporation of the produced smaller droplets. We proposed the conditions for the appearance of this explosive breakup of droplets. The present paper reports that the addition of small graphite particles into heterogeneous droplets can reduce their lifetimes by about 50% in this type of high-temperature environment. Moreover, this facilitated the explosive breakup of droplets, allowing intense vaporization. This behavior led us to make the hypothesis that an insulating layer of vapor appears at the outside droplet surface and at the interface between the solid inclusions and the droplet. Measurements on the explosive breakup of heterogeneous water droplets have allowed establishing an increase of the evaporation surface area by almost fifteen times, as compared to the initial surface of droplets. However, when using graphite suspension, the measured increase of the evaporation surface was not larger than threefold. The evaporation surface area during the explosive breakup of water-graphite suspensions was 5.4 smaller as compared to water without impurities. We reported on the reasons for the above differences. The results are useful for developing technologies of fire extinguishing by using water sprays containing non-metallic solids. Practical implementation of the explosive breakup of heterogeneous droplets can eventually permit extinguishing fire on larger areas with an identical water load.

AB - Experimental research on mechanisms of vapor production by boiling and evaporation was carried out on heterogeneous droplets of water containing graphite particles of different sizes and concentrations, heated by high-temperature environment (up to about 1373 K). Different steps have been observed, such as free surface evaporation of the droplet, bubbles boiling at the solid inclusion/liquid interface, the explosive disintegration of a drop into a cluster of small droplets and efficient evaporation of the produced smaller droplets. We proposed the conditions for the appearance of this explosive breakup of droplets. The present paper reports that the addition of small graphite particles into heterogeneous droplets can reduce their lifetimes by about 50% in this type of high-temperature environment. Moreover, this facilitated the explosive breakup of droplets, allowing intense vaporization. This behavior led us to make the hypothesis that an insulating layer of vapor appears at the outside droplet surface and at the interface between the solid inclusions and the droplet. Measurements on the explosive breakup of heterogeneous water droplets have allowed establishing an increase of the evaporation surface area by almost fifteen times, as compared to the initial surface of droplets. However, when using graphite suspension, the measured increase of the evaporation surface was not larger than threefold. The evaporation surface area during the explosive breakup of water-graphite suspensions was 5.4 smaller as compared to water without impurities. We reported on the reasons for the above differences. The results are useful for developing technologies of fire extinguishing by using water sprays containing non-metallic solids. Practical implementation of the explosive breakup of heterogeneous droplets can eventually permit extinguishing fire on larger areas with an identical water load.

KW - Boiling

KW - Evaporation

KW - Fluid

KW - Graphite

KW - Phase transformation

KW - Solids

KW - Water droplet

UR - http://www.scopus.com/inward/record.url?scp=85042213207&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85042213207&partnerID=8YFLogxK

U2 - 10.1016/j.ijthermalsci.2018.02.011

DO - 10.1016/j.ijthermalsci.2018.02.011

M3 - Article

AN - SCOPUS:85042213207

VL - 127

SP - 360

EP - 372

JO - International Journal of Thermal Sciences

JF - International Journal of Thermal Sciences

SN - 1290-0729

ER -