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- W2373709785 abstract "Hilbert-Huang transform(HHT) was used to analyze the acoustic emission(AE) signals received from the wall of a stirred tank.The characteristic frequency scale(10-80 kHz),which represented the gas and liquid movement,was obtained to reconstruct the AE signals.The energy of the reconstructed AE signals was found changing regularly with increasing impeller speed in the stirred tank.Then,a criterion to determine the critical dispersion speed was proposed.When the energy of the reconstructed signals begins to increase remarkably after remaining constant,the corresponding impeller speed is the critical dispersion speed.Compared with visual observation,the average relative deviation of this method was less than 2.86%.Furthermore,it was found that external loop could fairly increase the critical dispersion speed by reducing the radial flow in the tank,and impairing the gas dispersion in the tank.According to the experimental results of different external circulation conditions,a predictive model for calculating the critical dispersion speed in a stirred tank with external loop was established.Its average relative deviation was less than 0.65%.The results show that the multi-scale analysis of acoustic signals based on HHT can accurately measure the critical dispersion speed." @default.
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- W2373709785 date "2012-09-01" @default.
- W2373709785 modified "2023-09-26" @default.
- W2373709785 title "Measurement of critical dispersion speed in stirred tank based on Hilbert-Huang transform" @default.
- W2373709785 doi "https://doi.org/10.3785/j.issn.1008-973x.2012.09.021" @default.
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