Impinging Jet Dynamics

TL;DR

This paper visualizes and analyzes the complex fluid dynamics of impinging liquid jets, revealing detailed flow patterns, wave phenomena, and atomization processes through advanced visualization and theoretical comparison.

Contribution

It introduces a ray-tracing visualization method to study impinging jet dynamics and compares observed wave phenomena with classical shallow water wave theory.

Findings

Identified various sheet and rim flow patterns including liquid chain and unstable rim.

Observed stationary asymmetrical waves consistent with existing theories.

Detailed visualization of atomization and droplet formation processes.

Abstract

In this fluid dynamics video, Ray-tracing data visualization technique was used to obtain realistic and detailed flow motions during impinging of two liquid jets. Different patterns of sheet and rim configurations were presented to shed light into the underlying physics, including liquid chain, closed rim, open rim, unstable rim and flapping sheet. In addition, stationary asymmetrical waves were observed and compared with existing theories. The generation of stationary capillary wave in respect to the liquid rim were explained by the classic shallow water wave theory. The atomization process caused by development of the impact waves were observed in detail, including fragmentation of liquid sheet, formation of liquid ligaments, and breakup of ligament into droplet. The locking-on feature of the wavelength of impact wave were also found to be similar to that of perturbed free shear layers.