Application of tracer gas techniques for measurement of friction-factors of rectangular ducts.

Cheong K W, Riffat S B
tracer gas, duct
Year:
1992
Bibliographic info:
Air Infiltration Review, Vol 13, No 4, September 1992, pp 10-11, 1 fig, 1 tab, 1 ref. #DATE 00:09:1992 in English

This work examines the application of the constant-injection and pulse-injection tracer gas techniques for measurement of airflow in rectangular ducts. Experiments were carried out in ducts with aspect ratios of 1,2, and 4. Tracer gas measurements were generally similar to measurements made using a pitot tube. Relationships for the friction-factor and hydrodynamic entrance length are presented for Reynolds number between 73,300 and 395,000.

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