Viscous extensional flow and drop breakoff

蜂蜜从勺子上掉下来是粘性流体在自由伸展流动中的日常例子，这种流动最终可能会分解成水滴。这种流动在现代技术中非常重要，包括喷墨打印、焊接、焊接和熔融金属加工、聚合物和玻璃纤维纺丝以及流变性测量。我们试图通过对流体力学的理论、计算和实验研究，加深对这种流动的机制的理解，特别是初始条件的作用和原始容器的几何形状，以及惯性、重力、粘度、粘弹性和表面张力等力之间的平衡。

Honey falling from a spoon is an everyday example of a viscous fluid in a free extensional flow which may eventually break up into drops. Such flows are important in modern technologies including ink-jet printing, welding, soldering and molten metal processing, polymer and glass fibre spinning, and for rheological measurement. We seek to increase understanding of the mechanisms governing such flows, particularly the role of initial conditions and the geometry of the original containing vessel, together with balances between forces such as inertia, gravity, viscosity, viscoelasticity, and surface tension, through a theoretical, computational and experimental study of the fluid mechanics.