?Momentum Coherence Breakdown of Bending Atomizing Liquid Jet?

Modeling of liquid jets in air cross flow is a very complex problem due to the complex interactions occurring between the atomizing liquid jet and the surrounding air flow. In this paper two simplified models are presented and their results are compared with experimental data obtained in a high-pressure channel at different air and jet velocities. The first one is an integral model based on the momentum balance equations written on a finite thin slice of the liquid column jet. Effectiveness of this model is closely related to parameters tuning based on comparison with available experimental data. The second one is a numerical model based on the same simplified momentum balance equations but written on a single non-spherical particle with the task of simulating the jet. It takes into account transport equations for continuous phase, standard k - e turbulent model, coupling between the phases and is solved by a commercially CFD code. Experimental data are obtained in a fully optical accessible tunnel in which the jet is injected perpendicularly to the air cross flow; a CCD digital camera collected shadowgraphs of the sprays at each light pulse generated by a low-pressure xenon flash lamp. The experimental trajectories have been compared with those obtained by using the described models to verify their agreement in dependence of the process parameters.