Conditions and Characteristics of High-Temperature Processes of Ebullition and Disintegration of Droplets of Water Emulsions

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Abstract

Experimental investigations into the high-temperature (700 to 1200 K) heating, evaporation, ebullition, and subsequent disintegration (breakup) of droplets of water emulsions (with a volume concentration of petroleum products to 70%) have been performed using high-speed video recording. Consideration has been given to the emulsions based on water, oil, mazut, kerosene, and industrial oil. A study has been made of two schemes of supply of energy to the droplet: local heating due to the contact with a heated metallic rod with variation in the cross section of its tip and evaporation on a massive heated substrate, i.e., a steel platelet of diameter 50 mm and thickness 5 mm. From the results of an analysis of the frames of videograms illustrating different schemes of implementation of the investigated processes of transformation of the surface of the emulsion droplet and of its heating, evaporation, filling with vapor bubbles, ebullition, and breakup, the authors have established the influence of basic factors (temperature and surface area of heating, concentration of the components, droplet dimensions, and properties of petroleum products) on the time of full evaporation of the emulsion droplet. Distinctive features of the processes of evaporation and ebullition of emulsion droplets in high-temperature superheating have been determined. The authors have singled out different regimes of heating of the droplets, which differ not only by the time of full evaporation but also by the effects (preservation of a monolithic state, explosive disintegration accompanied by the formation of a fine aerosol, and ignition of the emulsion).

Original languageEnglish
Pages (from-to)249-259
Number of pages11
JournalJournal of Engineering Physics and Thermophysics
Volume92
Issue number1
DOIs
Publication statusPublished - 15 Jan 2019

Fingerprint

Disintegration
disintegration
boiling
emulsions
Emulsions
evaporation
Evaporation
heating
petroleum products
Heating
water
Water
Petroleum products
Temperature
oils
superheating
kerosene
Video recording
platelets
Kerosene

Keywords

  • boiling
  • disintegration
  • droplet
  • emulsion
  • evaporation
  • high-temperature heating
  • impurities
  • petroleum products
  • rod
  • substrate
  • water

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Engineering(all)

Cite this

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title = "Conditions and Characteristics of High-Temperature Processes of Ebullition and Disintegration of Droplets of Water Emulsions",
abstract = "Experimental investigations into the high-temperature (700 to 1200 K) heating, evaporation, ebullition, and subsequent disintegration (breakup) of droplets of water emulsions (with a volume concentration of petroleum products to 70{\%}) have been performed using high-speed video recording. Consideration has been given to the emulsions based on water, oil, mazut, kerosene, and industrial oil. A study has been made of two schemes of supply of energy to the droplet: local heating due to the contact with a heated metallic rod with variation in the cross section of its tip and evaporation on a massive heated substrate, i.e., a steel platelet of diameter 50 mm and thickness 5 mm. From the results of an analysis of the frames of videograms illustrating different schemes of implementation of the investigated processes of transformation of the surface of the emulsion droplet and of its heating, evaporation, filling with vapor bubbles, ebullition, and breakup, the authors have established the influence of basic factors (temperature and surface area of heating, concentration of the components, droplet dimensions, and properties of petroleum products) on the time of full evaporation of the emulsion droplet. Distinctive features of the processes of evaporation and ebullition of emulsion droplets in high-temperature superheating have been determined. The authors have singled out different regimes of heating of the droplets, which differ not only by the time of full evaporation but also by the effects (preservation of a monolithic state, explosive disintegration accompanied by the formation of a fine aerosol, and ignition of the emulsion).",
keywords = "boiling, disintegration, droplet, emulsion, evaporation, high-temperature heating, impurities, petroleum products, rod, substrate, water",
author = "Volkov, {R. S.} and Kuznetsov, {G. V.} and Strizhak, {P. A.}",
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language = "English",
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T1 - Conditions and Characteristics of High-Temperature Processes of Ebullition and Disintegration of Droplets of Water Emulsions

AU - Volkov, R. S.

AU - Kuznetsov, G. V.

AU - Strizhak, P. A.

PY - 2019/1/15

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N2 - Experimental investigations into the high-temperature (700 to 1200 K) heating, evaporation, ebullition, and subsequent disintegration (breakup) of droplets of water emulsions (with a volume concentration of petroleum products to 70%) have been performed using high-speed video recording. Consideration has been given to the emulsions based on water, oil, mazut, kerosene, and industrial oil. A study has been made of two schemes of supply of energy to the droplet: local heating due to the contact with a heated metallic rod with variation in the cross section of its tip and evaporation on a massive heated substrate, i.e., a steel platelet of diameter 50 mm and thickness 5 mm. From the results of an analysis of the frames of videograms illustrating different schemes of implementation of the investigated processes of transformation of the surface of the emulsion droplet and of its heating, evaporation, filling with vapor bubbles, ebullition, and breakup, the authors have established the influence of basic factors (temperature and surface area of heating, concentration of the components, droplet dimensions, and properties of petroleum products) on the time of full evaporation of the emulsion droplet. Distinctive features of the processes of evaporation and ebullition of emulsion droplets in high-temperature superheating have been determined. The authors have singled out different regimes of heating of the droplets, which differ not only by the time of full evaporation but also by the effects (preservation of a monolithic state, explosive disintegration accompanied by the formation of a fine aerosol, and ignition of the emulsion).

AB - Experimental investigations into the high-temperature (700 to 1200 K) heating, evaporation, ebullition, and subsequent disintegration (breakup) of droplets of water emulsions (with a volume concentration of petroleum products to 70%) have been performed using high-speed video recording. Consideration has been given to the emulsions based on water, oil, mazut, kerosene, and industrial oil. A study has been made of two schemes of supply of energy to the droplet: local heating due to the contact with a heated metallic rod with variation in the cross section of its tip and evaporation on a massive heated substrate, i.e., a steel platelet of diameter 50 mm and thickness 5 mm. From the results of an analysis of the frames of videograms illustrating different schemes of implementation of the investigated processes of transformation of the surface of the emulsion droplet and of its heating, evaporation, filling with vapor bubbles, ebullition, and breakup, the authors have established the influence of basic factors (temperature and surface area of heating, concentration of the components, droplet dimensions, and properties of petroleum products) on the time of full evaporation of the emulsion droplet. Distinctive features of the processes of evaporation and ebullition of emulsion droplets in high-temperature superheating have been determined. The authors have singled out different regimes of heating of the droplets, which differ not only by the time of full evaporation but also by the effects (preservation of a monolithic state, explosive disintegration accompanied by the formation of a fine aerosol, and ignition of the emulsion).

KW - boiling

KW - disintegration

KW - droplet

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KW - high-temperature heating

KW - impurities

KW - petroleum products

KW - rod

KW - substrate

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