1. Self-excited pneumatic conveying through vertical curved 90° bends.
- Author
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Dong, Lin and Rinoshika, Akira
- Subjects
- *
PNEUMATIC-tube transportation , *PIPE , *VELOCITY - Abstract
Abstract The effect of self-excited soft fins on a pneumatic conveying with different vertical curved 90° bends was experimentally studied to reduce pressure drop, power consumption and conveying air velocity. The distributions of particle velocity and particle fluctuating velocity near and in the first bend were measured based on the high-speed PIV. The polyethylene particles with a diameter of 2.3 mm were used as conveying materials. The superficial air velocity was varied from 10 to 14 m/s, and the stable mass flow rate was fixed at 0.45 kg/s. Compared to the non-fin pneumatic conveying, the pressure drop, the minimum pressure drop (MPD) velocity, power consumption, and additional pressure drop can be reduced by using soft fins for two bends of different radii (R/D = 3.2 and 4.4) in lower air velocity range. The maximum reduction rates of the MPD velocity and power consumption by using soft fins is about 8.2% and 8%, respectively. At the upstream of the bend, the particle velocity of the soft fins is higher than that of the non-fin. The effect of soft fins on the particle velocity and its fluctuating energy remains in the bend. The particle velocity and fluctuating energy of particle velocity of the soft fins are higher than that of the non-fin in the first vertical bend. At the downstream of the bend, the fluctuating energy of particle velocity of the soft fins is higher than that of non-fin in the large radius bendon the top part of the pipe. Graphical abstract Unlabelled Image Highlights • A pneumatic conveying with vertical bends by using soft fins was studied. • The pressure drop, additional pressure drop and particle velocity were measured. • The pressure drop and conveying velocity were reduced by fins. • Particle velocity of fins was higher than that of non-fin near and in the bend. • Effect of fins on the particle velocity and fluctuating energy remains in the bend. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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