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sirljz(金币+2): 2010-05-11 18:55:32
风雨182(金币+50, 翻译EPI+1): 2010-05-12 08:06:55
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Figure 2-16 are the power spectrum of C class particles time series under different sound pressure. From the figure, the energy value of C type particle pressure fluctuation signals show the broadband characteristics after the introduction of sound field, but there are still significant frequency generally from 0.05 to 0.25 Hz. The introduction of sound waves decreases the peak frequency of power spectral; moreover, the greater sound pressure the smaller peak frequency, and the more width the particle high-frequent domain. This is because the energy produced by sound wave can reduce the bubble size, increase the relative concentration of particles and enhanced gas-solid mass transfer. The greater sound pressure and energy are more favorable flow of particles. The statistics analysis of particle pressure fluctuation shows that the introduction of low-frequency high-intensity sound waves is conducive to the improvement of particle vibrating acceleration, and makes particles generate cyclical fluctuations in the high-speed alternative vibration of sound pressure. Therefore, the low frequency produced by the motion of the bubble phase became small, while the high-frequency field produced by the particles movement became wide. |
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