Role of Transient Dynamics in Dripping-Jetting Transition in Newtonian Fluids

TL;DR

This paper investigates the transition from dripping to jetting in Newtonian fluids, emphasizing the role of transient dynamics and inlet velocity perturbations, and characterizes the transition through liquid jet length and droplet size.

Contribution

It introduces a detailed analysis of the transient behaviors during the dripping-jetting transition, highlighting the influence of inlet velocity perturbations and fluid properties.

Findings

Transition occurs after several droplets form in the dripping regime.

Perturbations in inlet velocity significantly affect the transition dynamics.

Solution of slender jet equation relates transition to fluid properties.

Abstract

Dripping dynamics has been well studied over the past century and forms a classic example of chaotic system in physics. With an increase in the inlet flow rate, periodic droplet formation from a faucet becomes chaotic in terms of the droplet size and the length of the liquid column at the time of pinch-off. With a further increase in the flow rate, dripping regime transitions into jetting regime where the liquid column length is much longer than that observed in the dripping case. In general, dripping faucet is seen as a long time behavior of the system at fixed control parameters. In the steady state condition, different nonlinear behaviors such as periodic and chaotic formation of droplets are observed in the dripping and jetting regimes. It is known that dripping faucet shows chaotic dripping regime before jetting regime ensues. At a critical inlet velocity, $U_{m-d_j}$, we note that dripping to jetting transition occurs after several droplets have formed in the dripping regime. The transition behaviour can be characterized by the time evolution of the liquid jet length $L$ and droplet size $D_p$. Solution to slender jet equation show that the dripping-jetting transition region is a function of the fluid properties. Further, we show that perturbations in the inlet velocity can significantly modify the transient behavior of the dripping to jetting regime transition.