主催: 日本学術会議 メカニクス・構造研究連絡委員会
共催: 応用物理学会, 化学工学会, 土木学会, 日本風工学会, 日本機械学会, 日本気象学会, 日本計算工学会, 日本建築学会, 日本原子力学会, 日本航空宇宙学会, 日本地震工学会, 日本数学会, 日本数値流体力学会, 日本造船学会, 日本物理学会, 日本流体力学会, 日本レオロジー学会, 農業土木学会, 無機マテリアル学会
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Formation of an axisymmetric liquid jet from an orifice into another immiscible liquid, and its breakup into drops are studied using direct numerical simulations. A front tracking/finite difference method is used to track unsteady motion of the liquid-liquid interface. When the Weber number is high (We > 2) and the viscosity ratio is unity, the resulting drops break off due to capillary wave instability. Double-node breakup, where two-wave length of the most unstable wave becomes one drop, is often observed, and it is the one of the causes why linear stability theory fails to predict the size of the drops in practical situations.
