Turbulent mixing in a two-dimensional jet
| Autor: | Param Indar Singh, Mahinder S. Uberoi |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
Physics
Jet (fluid) business.industry Astrophysics::High Energy Astrophysical Phenomena General Engineering Mechanics Edge (geometry) Temperature measurement Flow measurement Optics Overshoot (signal) High Energy Physics::Experiment Resistance thermometer Mean radiant temperature business Mixing (physics) |
| Zdroj: | Physics of Fluids. 18:764 |
| ISSN: | 0031-9171 |
| DOI: | 10.1063/1.861236 |
| Popis: | An ensemble of instantaneous temperature profiles across a two‐dimensional heated jet was obtained by shooting a fine platinum resistance thermometer across the jet at speeds much higher than the local velocity of the jet. Each recording of the ensemble was shifted to have a common center, and ensemble averages were obtained counting only the profiles for which the spatial location in question was inside the jet. This conditional averaging produced mean and mean‐square fluctuations which are quite flat across the jet, indicating that the fluid inside the jet is well‐mixed. Visual inspection of instantaneous records showed no cold spots in the jet. Ensemble averages were also measured by aligning the edge or beginning of the instantaneous profiles. This led to a sharper rise in the mean temperature profile and an overshoot in the mean‐square temperature fluctuations. This indicates that mixing across the turbulent‐nonturbulent interface is stronger than in the main body of the jet. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|