RT Journal Article
ID 1a0eff0c1a9d3039
A1 Okabe, Takahiro
A1 Katagata, Naoki
A1 Sakaki, Toshihiro
A1 Shirota, Minori
A1 Fumoto, Koji
A1 Inamura, Takao
T1 TIME-DEPENDENT BREAKUP LENGTH OF LIQUID SHEET IN PREFILMING TYPE OF AIRBLAST ATOMIZER
JF Atomization and Sprays
JO AAS
YR 2019
FD 2019-08-20
VO 29
IS 4
SP 289
OP 303
K1 prefilming airblast atomizer
K1 breakup length of liquid film
K1 breakup frequency
K1 roll wave
AB 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.
PB Begell House
LK https://www.dl.begellhouse.com/journals/6a7c7e10642258cc,00c8ee9d28f7df4f,1a0eff0c1a9d3039.html