Abstract
ABSTRACT INLET pressure and pressure drop across an exit orifice were measured for various air flows and depths of fresh tobacco leaves and whole plants bulked at 180 to 300 kg/m3 in a curing configuration. Flow was calculated from the pressure drop across the orifice. Air flow through leaves and whole stalks as a function of the pressure gradient gave the expected straight line plot on a log-log graph with a slope of 0.64 to 0.88. Bed depth effects could be effectively normalized by dividing the pressure by the depth. The intercept decreased appreciable with increases in the bulk density of the tobacco thus reflecting the increases in flow resistance with density. Correlation coefficients varied from 0.86 to 0.99 with most of them being about 0.99. Density effects, which caused large decreases in flow as density increased, could be approximately normalized by dividing the pressure gradient by the third power of the ratio of the actual density to a reference or average density. Lower densities tended to be overcompensated and higher densities tended to be undercompensated.
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