Abstract
Scalar mixing is investigated in a decelerating turbulent round jet using direct numerical simulation. The main focus is to determine and model any new self-similar states in the unsteady flow as well as predict the centerline evolution of relevant flow quantities. The mass fraction of jet fluid and the fluid residence time, measured by the mass-weighted stream age of the jet fluid, both exhibit self-similar radial profiles in statistically stationary turbulent jets. Upon stopping the inflow, a deceleration wave passes through the jet, behind which a new self-similar state is observed for the two scalar variables. The self-similar state during the jet deceleration is different from that in the statistically stationary jet. Contrary to the steady-state behavior, the jet fluid mass fraction exhibits a linear increase with downstream distance in the decelerating jet, whereas the centerline mass-weighted stream age of jet fluid remains proportional to downstream distance. Scalar transport budget analysis shows that the radial transport term increases for both scalars, and that the contribution of the streamwise transport term of jet mass fraction changes sign between steady and unsteady cases.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
