Influence of the Heat Flux and of the Gas on Heat Transfer and Friction Coefficients in a Smooth Cylindrical Tube; INFLUENCE DU FLUX DE CHALEUR ET DE LA NATURE DU GAZ SUR LES COEFFICIENTS D'ECHANGE ET LE FROTTEMENT DANS UN TUBE CYLINDRIQUE LISSE
A stainless steel tube, heated by d-c current, was used in the experiments. Special care was taken (heated jacket) to avoid heat loss and to provide very accurate measurements. The cooling gases tested were air and carbon dioxide at pressures of 2.5 to 19 psi. The Reynolds number ranged from 70,000 to 10/sup 6/, and the wall temperature and the heat flux reached, respectively, 430 deg C and 16 watts/ cm/sup 2/. The Reynolds number Re/sub m/, Stanton number M/ sub m/-and friction coeificient f were computed by evaluating the physical properties of the gases at the mean temperature T/sub m/. For a given Reynolds number, a decrease of M/sub m/ and of f was observed when the heat flux increased; this decrease reached 10%. A formulation is proposed to express this effect in terms of a heat flow parameter T/sub p/ - T/sub m//T/sub p/ used as a corrective factor (T/sub p/ = wall temperature). (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Saclay
- NSA Number:
- NSA-18-001860
- OSTI ID:
- 4146513
- Report Number(s):
- CEA-2276
- Resource Relation:
- Other Information: Thesis submitted to Universite, Paris. Orig. Receipt Date: 31-DEC-64
- Country of Publication:
- France
- Language:
- English
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