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Tracer‐gas measurements in smooth and artificially roughened ducts
Author(s) -
Riffat S. B.
Publication year - 1991
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4440150204
Subject(s) - pitot tube , tracer , duct (anatomy) , reynolds number , mechanics , airflow , friction factor , materials science , chemistry , turbulence , flow (mathematics) , physics , thermodynamics , anatomy , nuclear physics , medicine
The paper examines the application of the constant‐injection tracer‐gas technique for the measurement of airflow in smooth and artificially‐roughened ducts. Experiments were carried out for the ratio of rib to duct height ( K/H ) of 0.1 and for a ratio of rib spacing to rib height ( P/K ) of 10. A comparison between tracer‐gas measurements and measurements made with a pitot tube showed that the closest agreement was obtained when experiments were performed in the rough duct. Relationships for the friction‐factor f and Reynolds number Re are presented both for smooth and rough ducts.