Contribution to the Study of Strong Heat Transfer within Tubes; CONTRIBUTION A L'ETUDE DES TRANSFERTS DE CHALEUR INTENSES DANS LES TUBES
Technical Report
·
OSTI ID:4285197
As the Colburn formu1a for the Margoulis number gave inaccurate results at high temperatures, an investigation was made to find an expression for the Margoulis number better adapted to high temperatures. The Prandtl-Karman friction law, which was valid oriy in the absence of heat transfer, was modified, and an analogy relation between the friction and the heat transfer was developed which accounted for the temperatare difference between the walls of the tube and the fluid. The expression derived was applied to some experimerta1 results on an electrically herted cylindrical tube 10 mm in diameter and 1 m long. The maximum temperature of the tube varied from 800 to 1160 deg C, and the temperatare difference between fluid and wall was about 400 deg C. The investigation was made over a range of Reynolds numbers from 36,000 to 206,000. A comparison of the measured and computed values of the temperature excess of the wall over fluid temperature shows a discrepancy of about 4%. (J.S.R.)
- Research Organization:
- Societe Nationale d'Etude et de Construction de Moteurs d'Aviation, Paris
- NSA Number:
- NSA-13-006941
- OSTI ID:
- 4285197
- Report Number(s):
- A/CONF.15/P/1170
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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