Experimental Study of the Heat Transfer and of Pressure Losses with Gaseous Hydrogen in Turbulent Flow in a Tube and in an Annular Space; ETUDE EXPERIMENTALE DU TRANSFERT DE CHALEUR ET DES PERTES DE CHARGE AVEC L'HYDROGENE GAZEUX EN ECOULEMENT TURBULENT DANS UN TUBE ET DANS UN ESPACE ANNULAIRE
Three different dispositions are used: a tube (diameter 4 mm, length 320 mm) and two annular spaces (3 x 8.8 and 5 x 8.8 mm, length 260 mm). The tubes are of stainless steel and are heated by a 50 cycle alternating current. The Reynolds number varied from 4000 to 120,000, the wall temperature up to 700 deg C, and the exit-temperature up to 500 deg C. Heat flows of up to 170 W/cm/sup 2/ were observed. All the experimental results can be summed up by a correlation expression of the Colburn type Nu = 0,020 Re/sup 0.8/ Pr/sup 0.4/, a s long as the physical properties of the gas are expressed at the film temperature t/sub 0.3/ = t/sub m/ + 0.3 (t/sub p/ - t/sub m/). A variat ion of the film temperature index with the ratio of -the heated to the wetted perimeters is observed. The pressure loss coefficients measured are slightly higher than those calculated using von Karman formula for smooth tubes. (auth)
- Research Organization:
- France. Commissariat a l'Energie Atomique. Centre d'Etudes Nucleaires, Grenoble
- NSA Number:
- NSA-15-026166
- OSTI ID:
- 4006683
- Report Number(s):
- CEA-1790
- Country of Publication:
- France
- Language:
- English
Similar Records
Contribution to the Study of Strong Heat Transfer within Tubes; CONTRIBUTION A L'ETUDE DES TRANSFERTS DE CHALEUR INTENSES DANS LES TUBES
Friction and Heat Transfer in Square and Circular Channels Containing Smooth Tubes and Finned Tubes; FROTTEMENT ET TRANSFERT DE CHALEUR DANS DES CHENAUX CARRES ET CIRCULAIRES CONTENANT DES TUBES LISSES ET DES TUBES MUNIS D'AILETTES