Work

Self-sustained oscillations in a low-viscosity round jet

Year: 2024

Type: article

Abstract: When a jet of fluid emerges into an ambient medium of the same density but higher viscosity, the dominant mode of instability transitions from axisymmetric at low viscosity ratio M to a helical mode at high M. It is shown that these helical modes are unstable global modes associated with enhanced mixing and the emergence of a single dominant frequency observed everywhere in the near field. These frequencies align well with predictions of absolute instability from spatiotemporal linear stability theory.

Source: Physical Review Fluids

DOI: 10.1103/physrevfluids.9.083902

Authors: V. Srinivasan, X. Tan, E. Whitely, I. Wright, A. Dhotre, J. Yang

Institution: University of Minnesota

Language: English

Topic: Fluid Dynamics and Turbulent Flows

Subfield: Computational Mechanics

Field: Engineering

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, Division of Chemical, Bioengineering, Environmental, and Transport Systems

Awards: G5859165572, Enhanced Atomization of Viscous Liquids Using Insights from Global Instabilities of Two-Phase Countercurrent Mixing Layers