Turbulent transport phenomena in an unsteady planar jet with self-sustained oscillations was studied analytically and experimentally. It was shown that the deterministic unsteadiness in the gas stream creates additional inertia forces and heat fluxes. The concepts of oscillation stress and heat flux were incorporated in the data processing to quantify the contributions of deterministic oscillations. Complete sets of measurements in the steady and oscillatory planar jets were taken with a crossed and a single hot wire probe. Using a decomposition technique, turbulent and oscillatory quantities, including second order quantities were obtained. The kinetic energy budgets for both steady and oscillatory flows were compared to each other. It is concluded that the deterministic unsteadiness enhances the transport process significantly. The contributions of deterministic oscillatory flow and turbulent flow to momentum and kinetic energy transfer are identified in an effort to explain the momentum and heat transfer enhancement in unsteady flows.
|Original language||English (US)|
|Number of pages||13|
|Journal||American Society of Mechanical Engineers, Aerospace Division (Publication) AD|
|State||Published - 1994|
All Science Journal Classification (ASJC) codes
- Space and Planetary Science
- Mechanical Engineering