Drying of Paddy for a Community Rice Mill by Vortex Technique in a Cyclone Tank
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This paper presents the experimental study of drying of paddy by vortex technique in a cyclone tank. The electricity is used to be the heat supply for drying in order to decrease moisture and time of exposing from the sun from 1-2 days in average to be 1 hour. The temperature for drying of paddy was held constant at 80°C. The diameter of drying tank is 0.4m (D). The heights of the drying tank are designed to be adjustable for five-size 1.6m (H/D=4.0), 1.8m (H/D=4.5), 2.0m (H/D=5.0), 2.2m (H/D=5.5) and 2.4m (H/D=6.0) as desired with a set of air nozzles placing circumferentially on the cyclone tank to produce air-swirl flow inside. The ratio of volumetric flow rates of the secondary air to the total air, was set to be 0.0 and 0.47 for each test condition. The experiment shows the lowest moisture about 15.4% w.b. for 50 minutes when the height of drying tank size is 1.8m (H/D=4.5) and = 0.47.
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