Abstract: The development and application of pneumatic conveying equipment is still confined to ignore the energy consumption of the extensive stage. The self-excited oscillation flow, generated by the soft fin mounted in the entrance of pipeline, is applied in the horizontal pneumatic conveying in order to promote pneumatic conveying system and save the system energy. First, the pressure drops and minimum, the critical velocities and the power consumption coefficient are measured and calculated, which results show that the minimum and critical velocities and power consumption are reduced by the self-excited oscillation flow, and the maximum reduction is 15.2% and 25.5%, respectively. Then, the particles flow regime and particle velocity are measured by using by using particle image velocimetry (PIV), and found that low speed conveyor with the self-excited oscillation flow can avoid particle deposition, increasing the particle axial and suspension velocity; at the same time, the particle fluctuation velocity is analyzed under different cases using fast Fourier transform (FFT) method, it is found that the particle velocity fluctuation intensity with the self-excited oscillation flow is larger than the traditional transport, reveals the energy-saving mechanism of the self-excited oscillation flow.

Key words: 3D Printing, biomimetic design, osteochondral scaffold, polylactide, β-tricalcium phosphate, minimum and critical velocities, particle fluctuation velocity, particles velocity, pneumatic conveying, power spectrum