Mechanism of Liquid Bridges Stretched out of a Liquid Bath

Abstract

In the present paper, we investigate liquid bridges stretched out of a liquid bath. The liquid bridge is formed between a perfectly wetting rod and a liquid bath, and can be stretched vertically at a constant velocity. We record the results with a high-speed camera and analyze the stretching process before the rod stops at a maximum height. The stretching process is mainly controlled by two dimensionless parameters, namely the Froude number and the Ohnesorge number, respectively representing the influence of inertia forces and viscous forces. The profile development, the pinch-off phenomenon and the volume of extracted liquid are studied in detail, particularly on the influences of stretching velocities and liquid viscosities. Finally, we reveal the underlying mechanism using the dimensionless momentum equation.