Micro-Explosion of Compound Drops

被引:0
作者
Chen, Chun-Kuei [1 ]
Lin, Ta-Hui [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 70101, Taiwan
来源
INTERNATIONAL CONFERENCE ON OPTICAL PARTICLE CHARACTERIZATION (OPC 2014) | 2014年 / 9232卷
关键词
Drop Combustion; Compound Drop; Micro-Explosion; Superheat Limit; Homogeneous Nucleation; Immiscible Fuel; BURNING CHARACTERISTICS; DROPLETS; MICROEXPLOSION; COMBUSTION; EMULSION;
D O I
10.1117/12.2063603
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In this study, compound drops were generated by using a coaxial nozzle in which the outer tube and the inner tube delivered different liquids. In comparison with an emulsion drop, a water-in-oil compound drop consists of a water core and an oil shell. There is an interface between water and oil inside of the compound drop. Owing to this distinct nature, combustion characteristics and micro-explosion phenomena of compound drops were examined in this study. The liquid tested in the experiment included dodecane, hexadecane, 95.5% ethanol and water. The water content of water-in-dodecane compound drop (beta(12)) varied from 25% to 85% in volume. The water content of water-in-hexadecane compound drop (beta(16)) was fixed at 25% and 40% in volume. The ethanol content of ethanol-in-dodecane compound drop (beta(e)) was fixed at 25% and 40% in volume. The drop diameter (d(i)) and the drop spacing (S/d(i)) was fixed at 500 mu m and 10, respectively. In the experiment, the variation of flame streak changed from yellow to blue flame with increasing the inner core water content of compound drop. The micro-explosion of compound drop had one model only. The micro-explosion phenomenon occurred because of bubble expansion from water (or ethanol) vapor inside the compound drop. The time history of micro-explosion from nucleation to bursting were in the order of beta(e) > beta(12)> beta(16). The micro-explosion intensity of compound drop were in the order beta(e) <= beta(12)< beta(16).
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页数:6
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