Experimental Studies on Grain Separator by means of Ascending Air Stream

About Separating Rice-Bran from Rice Cleaning Products

Abstract

The test was conducted by ascending air current aspirator, produced by way of experiment, for the purpose of separating bran in rice polishing process, and the following results were obtained.
1. the amount of rice, flowing from separating pipe into cyclon (1), increases with the mixed ratio and diminishes, on the contrary, with the amount of air flow, and does not flow-in beneath 4m/s of velocity.
2. Pressure loss in separating pipe increased suddenly with the air velocity higher than 4m/s.
3. The Fractional Recovery Efficiency turns onto the tendency of increasing with the mixed ratio near the air velocity of 4m/s. The efficiency increased on the side of low velocity, whereas the critical granular size diminishes with one.
4. Newton's Separation Efficiency showed high near the air velocity of 3m/s, and decreased inversely with the lower velocity because of the value of (mixed ratio/pressure loss) increases. The critical granular size diminished on the side of higher air velocity accompanied with the increase of ratio of (mixed ratio/pressure loss).
5. The length of separating pipe effects much on the separating efficiency, the length of 50cm is enough on this point of view for this presented apparatus.