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Aerodynamic Separation of Cobs from Corn Harvest Residues

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Transactions of the ASAE. 28 (3): 0893-0897. (doi: 10.13031/2013.32358) @1985
Authors:   R. D. Smith, R. L. Stroshine

ABSTRACT LABORATORY tests of the aerodynamic properties of the separate fractions of straw walker residues collected during corn harvest showed that most of the other residues could be separated from the loose cobs by using an air velocity of 10 m/s. However, complete pneumatic separation of all the cobs was impractical because some of the cobs still had attached husks and the suspension velocities of some stalks overlapped with those of the cobs. Stalk pieces with one end node had higher suspension velocities than symmetrical stalks. Tests with prepared symmetrical cob and stalk pieces showed that all the ideal cylindrical cob pieces could be separated from the ideal stalk pieces. Suspension velocities of ideal cylindrical corncobs ranged from 10.3 to 13.8 m/s while those of random straw walker cobs ranged from 5.5 to 13.9 m/s. Mean drag coefficients of the symmetrical cob and stalk samples were 0.81 and 0.86 respectively.

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