Conditions for Explosive Disintegration of Inhomogeneous Water Droplets on High-Temperature Heating

Research output: Contribution to journalArticle

Abstract

Experimental investigations of the characteristic stages of the processes of heating, evaporation, and explosive disintegration of inhomogeneous water droplets (with a commensurate graphite inclusion) in a high-temperature (600–1200 K) gaseous medium are carried out. Three methods of heating droplets differing in the dominating mechanism of heat transfer are used: heating in a muffle tube furnace (thermal radiation), in a stream of heated air (radiative-convective heat transfer), and in a stream of high-temperature combustion products of a typical liquid fuel (radiative-convective heat transfer). Characteristic values of each heat flux component ate determined for the conditions of experiments, as well as their dependences on temperature. It is shown that the highest values of the radiative heat flux (determining one from the viewpoint of the origination of the effect of explosive fragmentation of droplets) correspond to the schemes of heating in a stream of combustion products and in a tubular muffle furnace. The threshold values of the gaseous media temperatures at which a stable explosive disintegration of evaporating inhomogeneous droplets is realized (Tg > 850 K for conditions of heating in a stream of heated air, Tg > 800 K for the tubular muffle furnace, and Tg > 600 K for a stream of combustion products) have been obtained experimentally. With the use of thermocouple measurements the assumption on accumulation of the energy of thermal radiation near the liquid–solid particle interface and on the resulting formation of an additional source of liquid fi lm heating has been confirmed, which leads to the overheating of the liquid and to explosive disintegration of the droplet.

Original languageEnglish
Pages (from-to)1496-1504
Number of pages9
JournalJournal of Engineering Physics and Thermophysics
Volume91
Issue number6
DOIs
Publication statusPublished - 1 Nov 2018

Fingerprint

Disintegration
disintegration
Heating
combustion products
heating
water
furnaces
Water
Furnaces
radiative heat transfer
convective heat transfer
Heat radiation
thermal radiation
Heat transfer
Temperature
Heat flux
heat flux
liquid fuels
air
Liquid fuels

Keywords

  • disintegration
  • explosive fragmentation
  • graphite particle
  • heat flux
  • inhomogeneous droplet
  • intense vaporization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

@article{818c6f0986044847863715cc1ad9990d,
title = "Conditions for Explosive Disintegration of Inhomogeneous Water Droplets on High-Temperature Heating",
abstract = "Experimental investigations of the characteristic stages of the processes of heating, evaporation, and explosive disintegration of inhomogeneous water droplets (with a commensurate graphite inclusion) in a high-temperature (600–1200 K) gaseous medium are carried out. Three methods of heating droplets differing in the dominating mechanism of heat transfer are used: heating in a muffle tube furnace (thermal radiation), in a stream of heated air (radiative-convective heat transfer), and in a stream of high-temperature combustion products of a typical liquid fuel (radiative-convective heat transfer). Characteristic values of each heat flux component ate determined for the conditions of experiments, as well as their dependences on temperature. It is shown that the highest values of the radiative heat flux (determining one from the viewpoint of the origination of the effect of explosive fragmentation of droplets) correspond to the schemes of heating in a stream of combustion products and in a tubular muffle furnace. The threshold values of the gaseous media temperatures at which a stable explosive disintegration of evaporating inhomogeneous droplets is realized (Tg > 850 K for conditions of heating in a stream of heated air, Tg > 800 K for the tubular muffle furnace, and Tg > 600 K for a stream of combustion products) have been obtained experimentally. With the use of thermocouple measurements the assumption on accumulation of the energy of thermal radiation near the liquid–solid particle interface and on the resulting formation of an additional source of liquid fi lm heating has been confirmed, which leads to the overheating of the liquid and to explosive disintegration of the droplet.",
keywords = "disintegration, explosive fragmentation, graphite particle, heat flux, inhomogeneous droplet, intense vaporization",
author = "Vysokomornaya, {O. V.} and Piskunov, {M. V.} and Kuznetsov, {G. V.} and Strizhak, {P. A.}",
year = "2018",
month = "11",
day = "1",
doi = "10.1007/s10891-018-1885-x",
language = "English",
volume = "91",
pages = "1496--1504",
journal = "Journal of Engineering Physics and Thermophysics",
issn = "1062-0125",
publisher = "Springer GmbH & Co, Auslieferungs-Gesellschaf",
number = "6",

}

TY - JOUR

T1 - Conditions for Explosive Disintegration of Inhomogeneous Water Droplets on High-Temperature Heating

AU - Vysokomornaya, O. V.

AU - Piskunov, M. V.

AU - Kuznetsov, G. V.

AU - Strizhak, P. A.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - Experimental investigations of the characteristic stages of the processes of heating, evaporation, and explosive disintegration of inhomogeneous water droplets (with a commensurate graphite inclusion) in a high-temperature (600–1200 K) gaseous medium are carried out. Three methods of heating droplets differing in the dominating mechanism of heat transfer are used: heating in a muffle tube furnace (thermal radiation), in a stream of heated air (radiative-convective heat transfer), and in a stream of high-temperature combustion products of a typical liquid fuel (radiative-convective heat transfer). Characteristic values of each heat flux component ate determined for the conditions of experiments, as well as their dependences on temperature. It is shown that the highest values of the radiative heat flux (determining one from the viewpoint of the origination of the effect of explosive fragmentation of droplets) correspond to the schemes of heating in a stream of combustion products and in a tubular muffle furnace. The threshold values of the gaseous media temperatures at which a stable explosive disintegration of evaporating inhomogeneous droplets is realized (Tg > 850 K for conditions of heating in a stream of heated air, Tg > 800 K for the tubular muffle furnace, and Tg > 600 K for a stream of combustion products) have been obtained experimentally. With the use of thermocouple measurements the assumption on accumulation of the energy of thermal radiation near the liquid–solid particle interface and on the resulting formation of an additional source of liquid fi lm heating has been confirmed, which leads to the overheating of the liquid and to explosive disintegration of the droplet.

AB - Experimental investigations of the characteristic stages of the processes of heating, evaporation, and explosive disintegration of inhomogeneous water droplets (with a commensurate graphite inclusion) in a high-temperature (600–1200 K) gaseous medium are carried out. Three methods of heating droplets differing in the dominating mechanism of heat transfer are used: heating in a muffle tube furnace (thermal radiation), in a stream of heated air (radiative-convective heat transfer), and in a stream of high-temperature combustion products of a typical liquid fuel (radiative-convective heat transfer). Characteristic values of each heat flux component ate determined for the conditions of experiments, as well as their dependences on temperature. It is shown that the highest values of the radiative heat flux (determining one from the viewpoint of the origination of the effect of explosive fragmentation of droplets) correspond to the schemes of heating in a stream of combustion products and in a tubular muffle furnace. The threshold values of the gaseous media temperatures at which a stable explosive disintegration of evaporating inhomogeneous droplets is realized (Tg > 850 K for conditions of heating in a stream of heated air, Tg > 800 K for the tubular muffle furnace, and Tg > 600 K for a stream of combustion products) have been obtained experimentally. With the use of thermocouple measurements the assumption on accumulation of the energy of thermal radiation near the liquid–solid particle interface and on the resulting formation of an additional source of liquid fi lm heating has been confirmed, which leads to the overheating of the liquid and to explosive disintegration of the droplet.

KW - disintegration

KW - explosive fragmentation

KW - graphite particle

KW - heat flux

KW - inhomogeneous droplet

KW - intense vaporization

UR - http://www.scopus.com/inward/record.url?scp=85057161049&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85057161049&partnerID=8YFLogxK

U2 - 10.1007/s10891-018-1885-x

DO - 10.1007/s10891-018-1885-x

M3 - Article

VL - 91

SP - 1496

EP - 1504

JO - Journal of Engineering Physics and Thermophysics

JF - Journal of Engineering Physics and Thermophysics

SN - 1062-0125

IS - 6

ER -