Measuring the Concentration and Size of Particle in Two-phase System with Ultrasonic Velocity Method
The concentration and size distribution of particles in two-phase flow play an important role in a wide variety of industrial areas, while their measurement still remains troublesome at the present day. Ultrasonic wave as a mechanical vibration contains plenty of information about medium which it passes through. Thus the particle concentration and size distribution could be extracted from measured ultrasonic velocity by means of well-established models and data processing techniques. In this paper, coal-water slurries and fat emulsions were studied with an experiment apparatus which implements a twice pulse-echo measurement simultaneously. Ultrasonic velocity was obtained by recording the time-of-flight (TOF) of a known fixed sound-path length and the fitness of experimental data was carried out to yield the concentration of slurries. The frequency dispersion phenomenon of sound in the fat emulsions was observed and the frequency-dependent phase velocity was worked out through an insert substitution method. With the resulting velocity spectra, an inverse algorithm was put forward to give birth to the droplet size distributions for fat emulsions. After a comparison of results with that of optical method and an uncertainty discussion, conclusions were drawn for the proposed ultrasonic velocity method for particle characterization finally.
Multiphase Flow Ultrasound Particle Size
M.X.Su M.H.Xue H.S.Hou X.S.Cai X.H.Wang
Institute of Particle and Two-Phase Flow Measurement, University of Shanghai for Science & Technology, China
国际会议
西安
英文
275-280
2009-07-11（万方平台首次上网日期，不代表论文的发表时间）