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the intermittent spray characteristics assuming
continuous sprays independent of time, and they
examine mainly mean values during injection
periods. Resultantly, a few time-resolved data of
the intermittent sprays, which can be used to
clarify the development and disintegration pro-
cesses, are available. Therefore, an in-depth study
to verify the disintegration process of the multi- 1694 Jeekuen Lee, Shinjae Kang and Byung, joon Rho
hole diesel spray is needed.
There have been many studies on the diesel
sprays and their formation processes but a few
of the comparisons of the droplet formation pro-
cess between the multi-hole and the single-hole
diesel nozzles. Quoc and Brun (1994) suggested
the development of the spray was governed by the
three physical phenomena that are disintegration,
evaporation and coherence. Safman et ai. (1988)
expressed the droplet velocity distributions of the
single-hole diesel spray as a function of time.
They classified the spray structure into the lead-
ing edge, central part and trailing edge. It was
concluded that the reason for the reduction of
the number density of droplets in the central part
of the spray was that it was mainly composed of
the ligament that was not completely atomized.
Hosoya and Obokata (1993) analyzed the spray
characteristics of the multi-bole and the single-
hole nozzle using a LDV (laser Doppler anemo-
metry) and a PDA (phase Doppler particle an-
alyzer) system and suggested that the two mea-
surement systems were efficient for analyzing the
unsteady diesel spray. Arcoumanis et al. (1990)
investigated the spray formation process with
time. They suggested that the spray formed by the
multi-hole nozzle divided into the three parts
such as early injection period, main injection
period and after-injection period. Hiroyasu and
Aria (1990) investigated the droplet size of the
intermittent spray of the single-hole nozzle using
immersion liquid sampling, and they concluded it
decreased with the increase in injection pressure.
Arcoumanis et al. (1993) examined the atomi-
zation characteristics in a multi-hole nozzle by
using a PDA system. They showed that there is a
better improvement in the quality of atomization
in the 2-spring nozzle than in the I-spring nozzle
during the main injection duration. Bae et al.