(2) When air alone was blown, at the constant pipe diameter,pressure drop increases with an increase in air velocity. With a given pipe diameter, the power requirement of pneumatic conveyor is greatly influenced by the air velocity and rises with air velocity.
(3) The highest pressure drop was obtained from wheat,while the lower pressure drop was sunflower. The pressure drop increases as the air velocity for all seeds. The pressure drop rises directly with the conveying capacity.
(4) The highest power requirement was obtained for wheat, while the lowest was for the sunflower. For a given pipe diameter and air velocity, the power requirement increases with increasing conveying capacity for all seeds.
(5) The power requirement increases with the air velocity. It is desirable, therefore, to work the lowest possible air velocity to keep the power requirement as low as possible. But the danger of blockage should be taken into consideration because the blockages can occur when the energy of air flow is insufficient to keep up the conveying
process.
(6) The mechanical damage to the seeds increased as the air velocity increased at the inside diameters of 70.3 mm for the all seeds. The air velocity must therefore be regarded as a most critical factor in determining whether damage will occur or not. The results showed that the maximum mechanical damage was obtained for lentil, while the minimum mechanical damage was for wheat.
(7) The average values of germination and vigour index at the inside pipe diameters 70.3 mm for all seeds dropped after the pneumatic conveying. In addition,the germination and the vigour index decrease with increasing air velocity. The maximum loss of germination was obtained for sunflower, while the minimum
loss of germination was for wheat. But a higher loss of vigour occurred in wheat, while sun-flower had the minimum vigour loss.
(2) When air alone was blown, at the constant pipe diameter,pressure drop increases with an increase in air velocity. With a given pipe diameter, the power requirement of pneumatic conveyor is greatly influenced by the air velocity and rises with air velocity.
(3) The highest pressure drop was obtained from wheat,while the lower pressure drop was sunflower. The pressure drop increases as the air velocity for all seeds. The pressure drop rises directly with the conveying capacity.
(4) The highest power requirement was obtained for wheat, while the lowest was for the sunflower. For a given pipe diameter and air velocity, the power requirement increases with increasing conveying capacity for all seeds.
(5) The power requirement increases with the air velocity. It is desirable, therefore, to work the lowest possible air velocity to keep the power requirement as low as possible. But the danger of blockage should be taken into consideration because the blockages can occur when the energy of air flow is insufficient to keep up the conveying
process.
(6) The mechanical damage to the seeds increased as the air velocity increased at the inside diameters of 70.3 mm for the all seeds. The air velocity must therefore be regarded as a most critical factor in determining whether damage will occur or not. The results showed that the maximum mechanical damage was obtained for lentil, while the minimum mechanical damage was for wheat.
(7) The average values of germination and vigour index at the inside pipe diameters 70.3 mm for all seeds dropped after the pneumatic conveying. In addition,the germination and the vigour index decrease with increasing air velocity. The maximum loss of germination was obtained for sunflower, while the minimum
loss of germination was for wheat. But a higher loss of vigour occurred in wheat, while sun-flower had the minimum vigour loss.
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