An experimental study of frequency regimes of honey coiling

A stream of viscous fluid falling from a fixed height tends to coil with specific behaviors that are influenced by fluid properties, fall height, and flow rate. Previous studies have shown the existence of three distinct regimes of liquid rope coiling: the viscous, inertial, and gravitational regimes, as well as a transition regime between the inertial and gravitational regimes, referred to as the inertio-gravitational (IG) regime. Scaling laws can be used to estimate the radius of the coils and coiling frequency given the fall height and fluid properties. In the IG regime, the coiling frequency of the liquid rope, with all initial parameters fixed, is multi-valued [1]. Jumps between different coiling frequencies in this regime are often accompanied by a change in the sense of rotation of the coil, accomplished through a ‘figure of eight ’ transition [1]. The purpose of this study is to experimentally verify the trends in coiling frequency indicated in the scaling laws and the existence of multiple coiling frequencies within the IG regime.