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Air flow in a tube with a diverging inlet: I. Development of the turbulent velocity profile
Author(s) -
Lana I. G. Dalla,
Christiansen S. E.
Publication year - 1967
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450450505
Subject(s) - conical surface , turbulence , tube (container) , inlet , mechanics , reynolds number , development (topology) , physics , air velocity , flow (mathematics) , airflow , geometry , materials science , optics , mathematics , thermodynamics , engineering , mechanical engineering , mathematical analysis , composite material
The results from an experimental study of the development of air velocity profiles in a vertical 6.25‐in. I. D., 28.5‐ft. long aluminum tube with a diverging conical entrance are reported. Using the axial development of centerline velocity as a starting‐length criterion, a maximum and asymptotic value was approached at 40 diameters from the tube entrance. The starting length was found to increase with increasing Reynolds number. The large center‐line velocity associated with the jetting of air from a 1‐in. I. D. tube into the diverging conical entrance enabled a more rapid development of the velocity profile than for the well known case of a converging rounded entrance. A limited comparison of undeveloped and fully developed velocity profiles in the turbulent core region of the 6.25‐in. tube was also made over Reynolds numbers from 9,000 to 55,000.