Numerical and experimental investigation of the axis-switching behavior of a rectangular jet

Journal article (2024)

Authors

C. García Llamas Eindhoven University of Technology
Viren Swami Eindhoven University of Technology
V.P. Petrova Eindhoven University of Technology, Multi Phase Systems - Mechanical, Maritime and Materials Engineering
Kay A. Buist Eindhoven University of Technology
J.A.M. Kuipers Eindhoven University of Technology
M. W. Baltussen Eindhoven University of Technology
Research Group
Multi Phase Systems (Mechanical, Maritime and Materials Engineering) (TU Delft)
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Published Date

2024

Language

English

Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Multi Phase Systems

Abstract

Rectangular jets exhibit axis-switching behavior which results in enhanced flow entrainment compared to round jets. This feature allows for their potential industrial use as passive flow controllers in mixing applications. However, rectangular jets have received limited attention compared to round jets. To operate rectangular jets optimally, a better understanding on the underlying phenomena influencing the axis-switching of the jet is required. In this paper, Direct Numerical Simulations of rectangular jets are performed at different injection velocities using the Local Front Reconstruction Method (LFRM) to track the liquid–gas interface. The simulations are validated using experiments in a similar range of Weber and Reynolds numbers. The obtained results showed that LFRM can accurately capture the jet oscillations, break-up lengths and droplet sizes observed experimentally. Additionally, a fully developed velocity profile at the nozzle outlet enhances the jet stability resulting in larger break-up length values compared to a uniform velocity profile.