Viscous linear stability of axisymmetric low-density jets: Parameters influencing absolute instability

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Viscous linear stability calculations are presented for model low-density axisymmetric jet flows. Absolute growth transitions for the jet column mode are mapped out in a parametric space including velocity ratio, density ratio, Reynolds number, momentum thickness, and subtle differences between velocity and density profiles. Strictly speaking, the profiles used in most jet stability studies to date are only applicable to unity Prandtl numbers and zero pressure gradient flows-the present work relaxes this requirement. Results reveal how subtle differences between the velocity and density profiles generally used in jet stability theory can dramatically alter the absolute growth rate of the jet column mode in these low-density flows. The results suggest heating/cooling or mass diffusion at the outer nozzle surface can suppress absolute instability and potentially global instability in low-density jets.

Original languageEnglish (US)
Article number007002PHF
Pages (from-to)1-7
Number of pages7
JournalPhysics of Fluids
Issue number2
StatePublished - Feb 2010

Bibliographical note

Funding Information:
The authors would like to acknowledge the support received through Grant No. CTS-0317429 from the National Science Foundation.


Dive into the research topics of 'Viscous linear stability of axisymmetric low-density jets: Parameters influencing absolute instability'. Together they form a unique fingerprint.

Cite this