This paper details experimental measurements and mathematicalmodeling of airflow through a perforated duct with anopenarea of 22% that is capped at the end. Measurements wereconducted on ducts with uniform diameters of 12, 10, and 8 in. (0.30, 0.25, and 0.20 m). All ducts were 20 ft (6.10 m) long, andinlet flow rates ranged from approximately 350 to 700 cfm (165 to 330 L/s). Flow rates were measured along the lengthof the duct using the pitot traverse method. The static pressurewas also measured. The flow through the duct was modeledassuming one-dimensional flow, and a differential equationwas derived using the mass, momentum, and energy equations. The resulting differential equation was solved numerically andthe results were compared to the experimental measurements.Good agreement was achieved when comparing the experimentaland model flow rates for all test runs with a maximumdifference of 14.0% and an average difference of 2.0%. Resultsfor the static pressure showed the same trends between the experiments and the model. The pressure was largest at thecapped end of the duct, where the experimental measurements exceeded the model results by a maximum of 21.8%.
Citation: 2016 Annual Conference, St.Louis,MO, Transactions 2016, Vol 122 pt. 2
Product Details
- Published:
- 2016
- Number of Pages:
- 8
- Units of Measure:
- Dual
- File Size:
- 1 file , 1.8 MB
- Product Code(s):
- D-ST-16-023
