Experimental analysis on particle fluctuation velocity in a horizontal air-solid two-phase pipe flow having a dune model

2019 
ABSTRACTTo further elucidate the mechanism of energy-conserving conveying in horizontal pneumatic conveying with the dune model, the high-speed particle image velocimetry (PIV) is applied to measure particle fluctuation velocity near the minimum conveying velocity of the conventional pneumatic conveying. This study focuses on the effect of mounting dune models on the horizontal pneumatic conveying in terms of power spectrum, auto-correlation coefficients, two-point correlation coefficients, fluctuation intensity of particle velocity, skewness factor and probability density function. It is found that the power spectra peaks with the dune model are larger than that of the non-dune system, suggesting the acceleration and suspending efficiency of the dune model, especially dune models mounted on the bottom of the pipe. Meanwhile, the profiles of particle fluctuation velocity intensity indicate that the large particle fluctuating energy is generated due to mounting the dune model so that the particles are more...
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