Abstract
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 language | English (US) |
---|---|
Article number | 007002PHF |
Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | Physics of Fluids |
Volume | 22 |
Issue number | 2 |
DOIs | |
State | Published - 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.