The combustion characteristics of freely falling droplets, individually generated by the merging of colliding water and hexadecane droplets, were investigated and compared with those for pure hexadecane and emulsified water/hexadecane droplets. The merging of the nominally nonmiscible hexadecane and water was manifested either in an apparently adhesive manner, or with the water droplet inserting into the hexadecane droplet. The latter, however, is the prevalent mode in hot environments and/or for droplet burning, provided the water volume fraction is less than 0.54 so it can be completely covered by hexadecane. Results on the combustion characteristics show that the ignition delay increases with increasing water content that for the same droplet size it varies with t ig (hexadecane) K eff (emulsion) > K eff (hexadecane). The role of the air bubbles entrapped upon coalescence of the colliding droplets in facilitating microexplosion is also discussed.
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Document Type: Research Article
Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan, Republic of China
Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey, USA
Publication date: January 1, 2004
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