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Atomization and Sprays

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ISSN Druckformat: 1044-5110

ISSN Online: 1936-2684

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TIME-DEPENDENT BREAKUP LENGTH OF LIQUID SHEET IN PREFILMING TYPE OF AIRBLAST ATOMIZER

Volumen 29, Ausgabe 4, 2019, pp. 289-303
DOI: 10.1615/AtomizSpr.2019030263
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ABSTRAKT

The aim of this study was to experimentally investigate the effects of prefilmer edge thickness on the time-dependent breakup length of liquid sheet in a prefilming airblast atomizer using a high-speed camera. Five different prefilmer configurations were tested to investigate the effect of widely varying prefilmer edge thickness (160, 500, 1250, 2000, and 3000 μm). The liquid volume flow rate per unit width of a prefilmer was varied from 0.8 to 2.6 cm3/(s·cm), and the air velocity was varied from 33.7 m/s to 83.0 m/s. An effort was made to quantify these effects on the time-dependent breakup length and its predominant frequency using an image processing technique and fast Fourier transform analysis. The experimental results showed that as the prefilmer edge thickness increased, a larger liquid volume accumulated at the prefilmer edge. This resulted in the elongation of the liquid sheet; thus, the breakup length increased and the predominant breakup frequency decreased. At a large liquid flow rate and air velocity, however, a two-dimensional wave, called a roll wave, formed on the prefilmer wall surface and triggered the sheet breakup. In this condition, the predominant breakup frequency is dominated by the roll wave, and the breakup length is influenced by the prefilmer edge thickness.

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REFERENZIERT VON
  1. Chaussonnet G., Gepperth S., Holz S., Koch R., Bauer H.J., Influence of the ambient pressure on the liquid accumulation and on the primary spray in prefilming airblast atomization, International Journal of Multiphase Flow, 125, 2020. Crossref

  2. Nazeer Y. H., Ehmann M., Sami M., Gavaises M., Atomization Mechanism of Internally Mixing Twin-Fluid Y-Jet Atomizer, Journal of Energy Engineering, 147, 1, 2021. Crossref

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