Temperature measurement in the trace of water droplet when heating by hot air

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Abstract

In this study, the temperature of a mixture of water vapor and air was measured behind the droplet, which is fixed in a hot air flow. The initial droplet radius varied from 1.3 mm to 1.7 mm. Air flow velocity was 2.5 m/s. The measurements were performed at a distance of 2 mm, 4 mm, and 8 mm from the back droplet surface. The initial air temperature varied in the range of 450–750 K. For the first time, the hypothesis was experimentally proved about significant reduction (from 10 K to 100 K) of gas temperature in the trace of the evaporating water droplet (even when the droplet size is less than 2 mm). The results explained the reasons for considerably different evaporation rates of water droplets during their motion in the form of an aerosol flow in a combustion zone. The study reported the sizes of the temperature trace of droplet, beyond which the temperature of the mixture of water vapor and air differed insignificantly (by less than 10 K) from the temperature of the air stream flowing around the droplet. The results of measuring the temperature of vapor/air mixture in the trace of the evaporating droplet proved the validity of the known models of high-temperature heating and evaporation of water droplets.

Original languageEnglish
Pages (from-to)256-264
Number of pages9
JournalExperimental Thermal and Fluid Science
Volume81
DOIs
Publication statusPublished - 1 Feb 2017

Fingerprint

Temperature measurement
Heating
Water
Air
Temperature
Steam
Water vapor
Evaporation
Aerosols
Flow velocity
Gases
Vapors

Keywords

  • Evaporation
  • High-temperature gases
  • Temperature measurement
  • Trace
  • Water droplet

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Nuclear Energy and Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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title = "Temperature measurement in the trace of water droplet when heating by hot air",
abstract = "In this study, the temperature of a mixture of water vapor and air was measured behind the droplet, which is fixed in a hot air flow. The initial droplet radius varied from 1.3 mm to 1.7 mm. Air flow velocity was 2.5 m/s. The measurements were performed at a distance of 2 mm, 4 mm, and 8 mm from the back droplet surface. The initial air temperature varied in the range of 450–750 K. For the first time, the hypothesis was experimentally proved about significant reduction (from 10 K to 100 K) of gas temperature in the trace of the evaporating water droplet (even when the droplet size is less than 2 mm). The results explained the reasons for considerably different evaporation rates of water droplets during their motion in the form of an aerosol flow in a combustion zone. The study reported the sizes of the temperature trace of droplet, beyond which the temperature of the mixture of water vapor and air differed insignificantly (by less than 10 K) from the temperature of the air stream flowing around the droplet. The results of measuring the temperature of vapor/air mixture in the trace of the evaporating droplet proved the validity of the known models of high-temperature heating and evaporation of water droplets.",
keywords = "Evaporation, High-temperature gases, Temperature measurement, Trace, Water droplet",
author = "Kuznetsov, {G. V.} and Strizhak, {P. A.} and Volkov, {R. S.}",
year = "2017",
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T1 - Temperature measurement in the trace of water droplet when heating by hot air

AU - Kuznetsov, G. V.

AU - Strizhak, P. A.

AU - Volkov, R. S.

PY - 2017/2/1

Y1 - 2017/2/1

N2 - In this study, the temperature of a mixture of water vapor and air was measured behind the droplet, which is fixed in a hot air flow. The initial droplet radius varied from 1.3 mm to 1.7 mm. Air flow velocity was 2.5 m/s. The measurements were performed at a distance of 2 mm, 4 mm, and 8 mm from the back droplet surface. The initial air temperature varied in the range of 450–750 K. For the first time, the hypothesis was experimentally proved about significant reduction (from 10 K to 100 K) of gas temperature in the trace of the evaporating water droplet (even when the droplet size is less than 2 mm). The results explained the reasons for considerably different evaporation rates of water droplets during their motion in the form of an aerosol flow in a combustion zone. The study reported the sizes of the temperature trace of droplet, beyond which the temperature of the mixture of water vapor and air differed insignificantly (by less than 10 K) from the temperature of the air stream flowing around the droplet. The results of measuring the temperature of vapor/air mixture in the trace of the evaporating droplet proved the validity of the known models of high-temperature heating and evaporation of water droplets.

AB - In this study, the temperature of a mixture of water vapor and air was measured behind the droplet, which is fixed in a hot air flow. The initial droplet radius varied from 1.3 mm to 1.7 mm. Air flow velocity was 2.5 m/s. The measurements were performed at a distance of 2 mm, 4 mm, and 8 mm from the back droplet surface. The initial air temperature varied in the range of 450–750 K. For the first time, the hypothesis was experimentally proved about significant reduction (from 10 K to 100 K) of gas temperature in the trace of the evaporating water droplet (even when the droplet size is less than 2 mm). The results explained the reasons for considerably different evaporation rates of water droplets during their motion in the form of an aerosol flow in a combustion zone. The study reported the sizes of the temperature trace of droplet, beyond which the temperature of the mixture of water vapor and air differed insignificantly (by less than 10 K) from the temperature of the air stream flowing around the droplet. The results of measuring the temperature of vapor/air mixture in the trace of the evaporating droplet proved the validity of the known models of high-temperature heating and evaporation of water droplets.

KW - Evaporation

KW - High-temperature gases

KW - Temperature measurement

KW - Trace

KW - Water droplet

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