论文标题
扭曲液体喷气机的形成
Formation of Twisted Liquid Jets
论文作者
论文摘要
由于表面张力，从非圆形孔口发出的液体喷气机表现出振荡。当孔口具有$ n $折的旋转对称性时，射流的材料横截面交替互换两个对称形状。这种称为轴切换的振荡是在轴周围的方位角方向上相对传播的两个波纹的叠加。在这项研究中，我们使用计算机模拟来证明我们可以通过调整孔口的初始速度曲线来拾取两个涟漪之一。由于方位角中的单波传播的结果，射流表面显示出扭曲的外观。与旋转的喷气机相反，扭曲的射流在轴周围没有角动量。我们在数值上证明了带有各种横截面的扭曲喷气机的形成，包括常规正方形。
Liquid jets issued from a non-circular orifice exhibit oscillation owing to the surface tension. When the orifice has an $n$-fold rotational symmetry, a material cross section of the jet interchanges two symmetric shapes alternately. This oscillation, called axis switching, is a superposition of two ripples oppositely propagating in the azimuthal direction around the axis. In this study, we used computer simulations to demonstrate that we can pick up one of the two ripples by adjusting the initial velocity profile of the orifice. As a result of the single wave propagation in the azimuth, the jet surface shows a twisted appearance. In contrast to the swirling jets, the twisted jet has no angular momentum around the axis. We numerically demonstrated the formation of twisted jets with various cross sections, including a regular square.
