Abstract
Atomization of small fuel droplets using a UV laser is considered experimentally under atmospheric conditions. The droplet diameters in the experiments are 30µm, 20µm, and 15µm. The maximum spatial resolution is 232nm/pixel. The temporal resolution is 100ns. The fuels under test are diesel oil (JIS K2204, No. 1), hexadecane (99.5%) and o-Xylene (98%). A Nd:YAG pulse laser operating at 266nm is used in the experiments. The maximum laser energy is 10mJ. The laser beam diameter is 5mm, and the flash time is 7ns. As a result, the diesel oil droplets of all diameters are atomized using 10mJ of laser energy. The 15-µm-diameter hexadecane droplets are not atomized. The laser energy threshold for atomization of the 30-µm-diameter o-Xylene droplets is 4.5mJ, and the calculated laser intensity is 450J/m2 under the assumption of a Gaussian distribution. The atomization delay time is almost 8µs. Moisture is observed just before atomization occurs. The moisture indicates that this phenomenon can be explained based on the heat transfer process of the laser energy.
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