The closely following combustion event tends to be different when
the amount of combustible air/fuel mixture varies [1]. Larger cone
angle and better radial fuel expansion can also be achieved if spray
is well dispersed. The availability of sufficient oxygen because of
the good dispersion enables the soot and particles to oxidize more
quickly [3]. It is therefore thought to be very helpful to investigate
the involved physical regimes and breakup characteristics for primary
breakup to get a better understanding of combustion and
emissions. The significance of the primary breakup arouses great
interests and great efforts have been made to reveal the complex
regimes and mechanisms involved.