Experimentally determining the sizes of water flow droplets entrained by high-temperature gases

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4 Citations (Scopus)

Abstract

Regularities pertinent to counter mixing of the flows of high-temperature (1000 K) gases and water (with the characteristic droplet sizes from 0.05 to 0.5 mm) are experimentally investigated using high- speed (10<sup>5</sup> snapshots per second) cross-correlation video recording equipment and panoramic optic digital “tracer” visualization methods (called the Particle Image Velocimetry and Interferometric Particle Imaging techniiques). The sizes of droplets entrained by high-temperature gases and their motion velocities acquired after having been mixed with gases (with the gas motion velocities varied in the range of 0.1-2.5 m/s) are established. The initial droplet motion velocities were varied from 0.5 to 5.0 m/s. Two characteristic water droplet motion modes in the counter flow of high-temperature gases under the conditions of intense phase transformations were established. It is demonstrated that the droplet motion pattern in the counter flow of high-temperature gases, as well as the droplet evaporation intensity depend in the main on the initial sizes of liquid droplets. The integral dependence Re<inf>dr</inf> = f(Re<inf>g</inf>) using which it is possible to predict the droplet motion modes and trajectories, as well as phase transformation intensity with the a priori known droplet sizes and steam–droplet and gas flow velocities is obtained.

Original languageEnglish
Article numberA008
Pages (from-to)586-592
Number of pages7
JournalThermal Engineering (English translation of Teploenergetika)
Volume62
Issue number8
DOIs
Publication statusPublished - 2015

Keywords

  • Droplets
  • Entrainment
  • Evaporation
  • High-temperature gases
  • Panoramic optical methods
  • Polydisperse water flow

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Nuclear Energy and Engineering

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