Characterization of the gas pulse frequency, amplitude and velocity in non-steady dense phase pneumatic conveying of powders--颗粒学报PARTICUOLOGY

Williams, K. C., Jones, M. G., & Cenna, A. A. (2008). Characterization of the gas pulse frequency, amplitude and velocity in non-steady dense phase pneumatic conveying of powders. Particuology, 6(5), 301–306. https://doi.org/10.1016/j.partic.2008.03.007

Characterization of the gas pulse frequency, amplitude and velocity in non-steady dense phase pneumatic conveying of powders

Kenneth C. Williams^*, Mark G. Jones, Ahmed A. Cenna

Centre for Bulk Solids and Particulate Technologies, School of Engineering, University of Newcastle, 2308, Australia

10.1016/j.partic.2008.03.007

Volume 6, Issue 5, October 2008, Pages 301-306

Received 28 December 2007, Accepted 6 March 2008, Available online 9 July 2008.

E-mail: ken.williams@newcastle.edu.au

Highlights

Abstract

Current modelling techniques for the prediction of conveying line pressure drop in low velocity dense phase pneumatic conveying are largely based on steady state analyses. Work in this area has been on-going for many years with only marginal improvements in the accuracy of prediction being achieved. Experimental and theoretical investigations undertaken by the authors suggest that the flow mechanisms involved in dense phase conveying are dominated by transient effects rather than those of steady state and are possibly the principal reasons for the limited improvement in accuracy. This paper reports on investigations on the pressure fluctuation behaviour in dense phase pneumatic conveying of powders. The pressure behaviour of the gas flow in the top section of the pipeline was found to exhibit pulsatile oscillations. In particular, the pulse velocity showed variation in magnitude while the frequency of the oscillations rarely exceeded 5 Hz. A wavelet analysis using the Daubechie 4 wavelet found that the amplitude of the oscillations increased along the pipeline. Furthermore, there was significant variation in gas pulse amplitude for different types of particulate material.

Graphical abstract

Keywords

Pneumatic conveying; Powders; Dense phase; Pulsatile flow; Transient flow

文章导读