The atomization technology of liquid is applied to a lot of fields like internal combustion engine, agriculture, chemistry, food, and medical supply, etc. now, and the important technology for solving the problems of environmental problems and energy conservation. In recent years, a micro bubble with diameter of tens of μm or less is paid to attention. As for this micro bubble, various characteristics that bubble with diameter of several mm doesn't have are possessed and, for instance, water purification, oil separating, growth promotion of creature, and reduction of frictional resistance are reported. In this study, it was examined whether making a further water drop minute was possible by mixing micro bubbles into water using a whirl type injection valve. Moreover, the influences of micro bubble diameter and void fraction on water drop diameter were examined. As a result, in low-pressure of atomizing pressure Ps=0.2MPaG, the maximum 32% effect of atomization was able to be achieved by mixing micro bubbles into water. Moreover, it was clarified that the effects of atomization were almost the same in 0.1% or more of void fraction.
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