The effective Reynolds number of a heated cylinder

The effective Reynolds number of a heated cylinder

The structure of the near wake behind a heated cylinder in air is investigated experimentally in the regime corresponding to the transition from a 2-D steady to a 2-D periodic wake. In this non-isothermal case an effective Reynolds number, Re eff , is used to characterize the flow regime. The corres...

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Veröffentlicht in:International journal of heat and mass transfer 1998, Vol.41 (12), p.1787-1794
Hauptverfasser: Dumouchel, F., Lecordier, J.C., Paranthoën, P.
Format: Artikel
Sprache:eng
Schlagworte:
Engineering Sciences
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Jets
Nusselt number
Physics
Reactive fluid environment
Reynolds number
Steady flow
Transition flow
Turbulent flows, convection, and heat transfer
Wakes
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Beschreibung
Zusammenfassung:The structure of the near wake behind a heated cylinder in air is investigated experimentally in the regime corresponding to the transition from a 2-D steady to a 2-D periodic wake. In this non-isothermal case an effective Reynolds number, Re eff , is used to characterize the flow regime. The corresponding effective temperature is found to be T∞ + 0.24( T w − T ∞) and is lower than the usual film temperature T film = T ∞ + 0.5( T w - T ∞). The structure of the velocity fields in the wake downstream the heated cylinder is found to be correctly characterized by this effective Reynolds number. Over this flow regime, Nusselt numbers are found to be dependent on a Reynolds number intermediate between Re eff and Re film.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(97)00293-7