Elliptical Jet Dynamics in Spray Applications
Summary
Elliptical jet dynamics govern how fluid streams emanating from non-circular orifices evolve, fragment and disperse into fine droplets. Unlike round jets, elliptical jets display pronounced axis-switching phenomena, where the major and minor axes of the cross-section periodically interchange downstream. This behaviour enhances shear layers, accelerates liquid breakup and promotes more uniform droplet distributions. Key parameters such as nozzle aspect ratio, injection velocity, ambient density and fluid properties dictate the onset of axis-switching, the length of the potential core and the spray tip penetration. The interplay between inertial forces and surface tension—characterised by the Weber number—determines the characteristic droplet size spectrum, often quantified via the Sauter mean diameter. Elliptical jets also exhibit asymmetric entrainment, leading to accelerated radial diffusion and earlier atomisation. Practical applications range from precision agricultural spraying and coatings to advanced combustion systems, where control of droplet size and penetration directly influences deposition efficiency, pollutant formation and resource consumption. Recent advances in combined experimental imaging and high-resolution simulation have clarified how design variables such as aspect ratio and backpressure modulate aerodynamic drag, spray cone angle and liquid-phase penetration, providing a framework for optimising nozzle geometry across industrial sectors.
Research from Nature Portfolio
No recent Nature Portfolio content available.
Elliptical Jet Dynamics in Spray Applications publication trend
The graph below shows the total number of articles in elliptical jet dynamics in spray applications across all publications each year (not limited to Nature Index journals).
Technical terms
Elliptical jet: A fluid jet issuing from a nozzle whose cross-section is an ellipse rather than a circle, leading to asymmetrical shear and breakup patterns.
Axis-switching: The phenomenon in which the major and minor axes of an elliptical jet’s cross-section interchange positions downstream due to vortex interactions.
Weber number: A dimensionless quantity expressing the ratio of inertial forces to surface tension forces in a fluid flow, influencing droplet formation.
Sauter mean diameter: A measure of average droplet size defined as the diameter of a sphere with the same volume-to-surface-area ratio as the ensemble of droplets.
Atomisation: The process by which a continuous liquid jet disintegrates into a spray of fine droplets under aerodynamic and surface tension forces.
References
- The Effect of Elliptical Diesel Nozzles on Spray Liquid-Phase Penetration under Evaporative Conditions. Energies (2020).
- Effects of Elliptical and Circular Nozzles on Diesel Spray Characteristics Under High Ambient Density. Applied Sciences (2024).
About these summaries
This Nature Research Intelligence Topic summary is created with the cited references and a large language model. We take care to ground generated text with facts, and have systems in place to gain human feedback on the overall quality of the process in line with our AI principles. We strive to create accurate and useful summaries for people unfamiliar with the research topic and that supports this goal. These pages are a beta release and will be updated as we learn how best to help people gain value from a research topic summary.
Turn complex research questions into confident strategic decisions
When you're under pressure to set direction, justify investment, or understand your competitive position, you need more than raw data — you need trusted insights you can act on.
Benchmark your performance against global peers using robust, methodologically sound analysis.
Combine quantitative metrics with qualitative expert insight to uncover strengths, gaps and emerging opportunities.
Gain tailored, decision-ready recommendations aligned to your strategic priorities.
Talk to us to learn more about our data dashboards and bespoke strategy reports.
Grow research skills, confidence and careers with training built for every stage of the research lifecycle.
Developed with Nature Portfolio journal Editors and internationally renowned experts. Discover three ways to learn:
Self-paced, online courses in convenient bite-sized units, covering key skills across scientific writing, publishing, grant writing, data analysis, and more.
Expert trainer-led workshops with hands-on exercises and real-time feedback across core research skills, delivered via interactive group sessions.
Editor-led workshops combining core principles in writing and publishing, personalised 1:1 feedback from Nature Portfolio Editors and hands-on exercises.
Explore course catalogues and workshop agendas, enquire about the options or request institutional pricing.