Science and Technology of Energetic Materials

Vol.74, No.4 (2013)


Origin of droplets in sparkling fireworks
Chihiro Inoue, Mitsuo Koshi, Hiroshi Terashima, Takehiro Himeno, and Toshinori Watanabe


The physics behind the beauty of sparkling fireworks has not been clarified yet due to a lack of detailed visualization results. In the present study, atomization process in sparkling fireworks is elucidated by using a high-speed video camera. In the first-half sequence of the fireworks, the fireball repeatedly expands, bursts, and shrinks due to the high pressure gas inside the fireball. In contrast, in the last-half sequence, the bubbly fireball slightly deforms, and small bubbles burst on the fireball. A scenario of droplets generation is as follows : a liquid thread extends from the bottom of the bursting fireball, and fragments into droplets. Thus the droplets originate from inside the fireball rather than from its surface.

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sparkling firework, high-speed video camera, visualization, atomization, bursting bubble

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