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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v9.i2-3.110
14 pages

EXPERIMENTAL STUDY ON THE BREAKUP MECHANISM OF A THIN LIQUID SHEET FROM AN AIR-ASSISTED PLANAR NOZZLE

Jae W. Park
Mechanical Engineering Department, Pohang University of Science and Technology, Korea
Kang Y. Huh
Mechanical Engineering Department, Pohang University of Science and Technology, Pohang, Korea
Metin Renksizbulut
Mechanical Engineering Department, University of Waterloo, Waterloo, Ontario, Canada

RESUMO

The disintegration mechanisms are investigated for a thin liquid sheet from an air-assisted planar nozzle. Compact halogen lamps with a reflection plate provided enough light to produce clear images with short exposure time. Sinuous waves are observed as rapidly growing thin films of high amplitudes, surrounded by ligaments of low amplitudes. Waves due to liquid turbulence are much smaller than a typical cell size, hence do not seem to be directly related with downstream cellular breakup. The film and ligament cellular structures (FLCS) form within tire distance of a typical cell size, while the average cell size depends on the relative velocity between liquid and air. It is proposed that the initial perturbations imposed by high-velocity air streams grow to end up with breakup according to Kelvin-Helmholtz instability.