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 language | English |
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Article number | A008 |
Pages (from-to) | 586-592 |
Number of pages | 7 |
Journal | Thermal Engineering (English translation of Teploenergetika) |
Volume | 62 |
Issue number | 8 |
DOIs | |
Publication status | Published - 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