Abstract
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.
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