Acoustic chemometrics on liquid flow: Shift in the frequency spectra and its relationship to the physical properties of the liquid and the pipe

摘要: Abstract Prediction of chemical composition from passive acoustic measurements using multivariate regression (i.e. chemometrics) liquid flows has been reported as a promising on-line measurement method. It is recently that the important predictive information could be related to frequency shift peaks in spectra. Little casual interpretation spectra reported. The present study discusses relations between chemometrically identified significant peak shifts, with prediction spectra, physical theory for vibration (sound) pipe and flows. Acoustic were obtained filled test liquids both situation no flow constant resulting pressure drop. two-component mixtures ethanol water, three-component ethanol, sucrose water. Experimental data compared theory. Results indicate some relate bubble oscillation. other shell (pipe) vibration. In measured at 14 ethanol. Five these seem oscillations nine agree experimental water more complex. Seven These oscillation prediction. ability each constituents was reasonably good. density probably major factor, affecting shift, given an otherwise fixed set-up.