Validity of the Archimedes number in ventilating commercial livestock buildings
1993
Berckmans, D. | Randall, J.M. | Thielen, D. van | Goedseels, V.
In previous work it has been stated that the corrected Archimedes number, Arc, can be used to show that air entering a rectangular room through an inlet just beneath the ceiling remains horizontal if Arc is below 30 and will fall if it is above 75. In previous work no measurements were made in a commercial livestock building with living animals. In this work a series of 80 experiments was done in a commercial pig house with a floor surface of 13.5 m by 3 m, with a 30% sloped ceiling of mean height 3.42 m, with the air inlet at one side in the wall and with a single outlet fan in the opposite ceiling-side. The experimental conditions of inlet velocity ranged from 0.3 to 10 m/s, and the temperature of the incoming air from -2.0 to 15.O degrees C. It is shown that the criterion of Arc, as defined by Randall and Battams, is valid in a commercial livestock building with different dimensions and geometry compared to previous work, with a specific air inlet system and with living animals. It is further concluded that the Arc criterion does not only apply to the direction of the air on entry, but that it is also related to the final path of the air trajectory further from the inlet.
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