An investigation of the relationship between acoustic emissions and particle size

Hansuld, Erin M.; Briens, Lauren; Sayani, Amyn; McCann, Joe A.B.

doi:10.1016/j.powtec.2011.12.025

Cited by 21 publications

(10 citation statements)

References 18 publications

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“…There was significant attenuation through the equipment walls for the externally located microphones at the interface and the grid, resulting in measurements with much lower amplitudes. Similar results were obtained by Hansuld et al [22] and Briens et al [24] for passive acoustic emissions recorded in the exhaust versus externally on a high shear granulator bowl. Additionally, the amplitude of the emissions measured at the interface was slightly larger than that measured at the grid.…”

Section: Discussionsupporting

confidence: 87%

“…As a monitoring technique, it has been explored in various industries, such as the chemical, biochemical and food industries, to provide insight into the physicochemical changes that occur within a process [19]. Specifically, in the pharmaceutical industry, passive acoustic emissions have been used to monitor high-shear and fluidized bed granulation processes, as well as fluidized bed drying [20][21][22][23][24][25]. A major advantage of acoustic emissions monitoring is the non-invasive nature and real-time means of collecting process information.…”

Section: Introductionmentioning

confidence: 99%

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Passive acoustic emissions monitoring of the coating of pellets in a fluidized bed—A feasibility analysis

Sheahan

Briens

2015

Powder Technology

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Passive acoustic emissions monitoring of the coating of pellets in a fluidized bed—A feasibility analysis

Sheahan

Briens

2015

Powder Technology

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“…Hansuld et al (2012) found that for a particular 10 Hz frequency band the power of the AE reduced with particle size. Importantly, they also state that motion in a granulator does not involve many headon contacts so the size of impacting particles may not affect the frequency of the AE in this manner.…”

Section: Passive Acoustic Monitoring Of Granulationmentioning

confidence: 96%

Acoustic emission monitoring from a lab scale high shear granulator—A novel approach

Watson

Povey

Reynolds

et al. 2014

International Journal of Pharmaceutics

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A new approach to the monitoring of granulation processes using passive acoustics together with precise control over the granulation process has highlighted the importance of particle-particle and particle-bowl collisions in acoustic emission. The results have shown that repeatable acoustic results could be obtained but only when a spray nozzle water addition system was used. Acoustic emissions were recorded from a transducer attached to the bowl and an airborne transducer. It was found that the airborne transducer detected very little from the granulation and only experienced small changes throughout the process. The results from the bowl transducer showed that during granulation the frequency content of the acoustic emission shifted towards the lower frequencies. Discrete element modelling of the granulator system show that when the particles increase in size and reduce in number the number of collisions the particles experience reduces. These simulation results coupled with previous theoretical work on the frequency content of an impacting sphere explain why the frequency content of the acoustic emissions reduces during granule growth. The acoustic system used was also clearly able to identify when large over-wetted granules were present in the system, highlighting its benefit for detecting undesirable operational conditions. High-speed photography was used to study if visual changes in the granule properties could be linked with the changing acoustic emissions. The high speed photography was only possible towards the latter stages of the granulation process and it was found that larger granules produced a higher magnitude of acoustic emission across a broader frequency range.

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“…Meanwhile, rather few applications of passive AE measurement dedicated to the monitoring and control of industrial processes were reported [4]. To speak only of pharmaceutical processes, and without being exhaustive, the correlation between audible acoustic emission and particle sizes was investigated by [5]. Several case-studies and review papers present AE applications in many fields of pharmaceutical process engineering: grinding [6], end-point detection in drying [7][8][9]5], blending and mixing [10,11], drying [12,13], fluidized beds [14], granulation [12,15], tabletting [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission during the solvent mediated cooling crystallization of citric acid

et al. 2016

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ABSTRACT:The potential of Acoustic Emission (AE) for controlling crystallization processes is investigated. The sensing technology is successfully applied to monitor the batch cooling crystallization of citric acid (CA) in water. The solventmediated phase transition between the anhydrous and the monohydrated forms of CA is clearly detected from the recorded acoustic measurements. A tremendous amount of acoustic data is recorded by the equipment, and the analysis of the data is focused on the evaluation of AE as a new sensor for monitoring the basic steps of the crystallization processes (i.e., nucleation, growth, phase transition, etc.) A time-and frequency-domain analysis is presented which shows the wealth of the technique. It is finally concluded that AE allows very early detection of nucleation events, provides a means of monitoring the development of the crystallization process and allows monitoring phase transition phenomena obtained through cooling. It is thus suggested that acoustic emission could be valuable in the development of new crystallization monitoring and control strategies: this is all the more interesting that the acoustic piezo-sensor is non-intrusive and does not require any sampling of the slurry, two features which are of tremendous importance in the field of cooling crystallization processes.

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An investigation of the relationship between acoustic emissions and particle size

Cited by 21 publications

References 18 publications

Passive acoustic emissions monitoring of the coating of pellets in a fluidized bed—A feasibility analysis

Passive acoustic emissions monitoring of the coating of pellets in a fluidized bed—A feasibility analysis

Acoustic emission monitoring from a lab scale high shear granulator—A novel approach

Acoustic emission during the solvent mediated cooling crystallization of citric acid

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