Abstract
Experiments were carried out with two duct spacings, two duct air escape areas, three depths of barley and various air flows, to determine the effect of these variables on the air distribution and the pressure losses in the barley when ventilated by grid type floor ducts. A study of the results showed that reducing the duct spacing significantly improved air distribution. Reducing the duct air escape area however, had only a small effect. With ducts at 3 ft spacing and grain depths above 2 ft 6 in from the duct floor the air distribution was independent of the grain depth. It was also concluded from the horizontal iso-pressure difference lines that the air flow was parallel above the 2 ft 6 in level. Consideration of the air flows and corresponding pressure drops in the non-parallel flow region showed they could be described for a given duct spacing and duct open area by an empirical equation.
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