Fluctuations de temperature dans un ecoulement turbulent a temperature elevee |
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Authors: | I. Gokalp A. Lasek |
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Affiliation: | Laboratoire d''Aérothermique du C.N.R.S., 4 ter, route des Gardes, F 92190, Meudon, France |
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Abstract: | The thermal fields are generally studied for only weakly heated turbulent flows.Presented here are thermal field measurements executed in a grid created turbulent air flow. heated to 400°C. The flow is established in a circular section cylindrical tube. The reference dynamic field is characterized by Re = 20. The obtained results indicate that the small eddies' dissipation increases with the mean temperature. The thermal field seems to be more and more structured by big eddies; it is observed that the dimensions of the most energetic eddies and the dissipation micro-scales of the thermal field are growing with the flow mean temperature. |
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