文档介绍：M. Tramontana1,2,3, A. Nordon2,3, A. Gachagan1, G. Hayward1 and D. Littlejohn2,3
Passive Acoustic Monitoring of a Heterogeneous Batch System
论文外文翻译
论文外文翻译
Introduction
Aim
Passive acoustic experiments
Modelling using Finite Element Techniques
Simulations and Validation
Results of the simulations
Transducer design
Experiments parison
Conclusion
OUTLINE
PASSIVE ACOUSTIC MONITORING TECHNIQUES
Passive acoustic monitoring methods can be used in process analysis for the monitoring of particulate systems, . high shear granulation.
However, in many cases, the information content of the signal is limited due to the use of a resonant transducer and/or conversion of the signal to a root mean-square-value RMS.
BENEFITS
Monitoring changes in the size and/or concentration of particles in fluids is important in many industrial process.
monitor samples contained in optically opaque vessels
monitor samples that are optically opaque
non-invasive,
non-destructive,
can be used in situ and in real-time.
non expensive.
AIMS
Modelling of particle interactions in order to understand particles interactions in a passive acoustic monitoring system
Investigate the factors that affect the broadband acoustic emission signal
Develop new ultrasonic transducer for passive acoustic process analysis.
PRELIMINARY EXPERIMENTS
At Strathclyde, a broadband piezoelectric transducer, attached to the external wall of a 1L jacketed glass reactor, has been used to monitor a model heterogeneous reaction.
1:Stirrer 2: Nano30 transducer 3: Oil jacket
Concentration and particle size information can be identified from the broadband emission spectrum.
In particular particle size information can be identified from the frequency shifting effects.
EXPERIMENTAL RESULTS
Emission spectrum different sizes of itaconic acid particles.
The frequency spectrum measured depends on the response characteristic of the system.
Vessel-transducer-amplifier curve of response obtained with pencil lea