Mechanism elucidation of the ultra-fine particle cluster of formation and growth and collapse and the control.

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It is necessary to estimate the interaction between particle and environment in the circumference in the formation of the particle cluster precisely for the elucidation of formation mechanism of the particle lump (cluster) with the adhesion in the inter-particle. By blowing under the normal pressure as a model of influent factor, and adjusting the humidity of the gas, the adhesion is artificially controlled in the inter-particle by the liquid cross-bridge, and the cluster is formed (the 30〜90% relative humidity). Formation mechanism and formation process were examined by adjusting their forming condition. In addition, in controlling sake, the ultrasonic wave is applied from the container side collapse, and the degree of a cluster collapse was measured by the measurement of the indirect pressure loss in the layer in respect of the formation cluster group (these laminate it, and the difficulty fluid particle group is formed). Simultaneously, this also measured this, because it was also i … More nfluenced to the heat transfer by the degree of the fluidity. It was examined experimentally by changing layer high, glass bead particle size, and gas velocity by relating gas stream from the dispersion edition to the ultrasonic wave impression strength, because the watercourse of the channeling is formed (progressing gas stream), when it is latter, while the cluster group is avoided. As the result, it destroys the liquid cross-bridge by the ultrasonic wave impression, and that it avoids the formation of the channel possibly improves the flow condition is possible. Once, there is the lowering of heat transfer coefficient over 90% in comparison with the heat transfer coefficient in flow condition in which the liquid cross-bridge does not exist in the inter-particle, when the channeling is formed in layer, and the recovery is very serious. In the low humidity condition (the degree of the cluster formation is small), though it was possible that the ultrasonic wave impression affected the flow condition of in layer, it was got that the effect does not affect, etc. as knowledge. Less