Particle characterization in highly concentrated suspensions by ultrasound scattering method

Weser, Robert; Wöckel, Sebastian; Hempel, U.; Wessely, Benno; Auge, J.

doi:10.1016/j.sna.2013.02.027

Cited by 20 publications

(15 citation statements)

References 7 publications

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“…Similar findings were obtained by R. Weser et. al [14,15] for experiments on glass microparticles. In these publications, it was pointed out, that the observed back scattering spectra could be approximated by multiplying the analytical solution described by Faran [12] and Hickling [13], by a concentration dependent constant.…”

Section: Resultsmentioning

confidence: 99%

“…The acoustic scattering of microparticle in fluids has been studied for past few decades by analytical solutions [12][13][14][15][16][17] as well as with finite element methods (FEM) [18] to understand their behavior. Resonance scattering theory has also been developed in gain more information regarding scattering responses from elastic objects in water [19].…”

Section: Introductionmentioning

confidence: 99%

“…Resonance scattering theory has also been developed in gain more information regarding scattering responses from elastic objects in water [19]. Experimentally, high frequency ultrasound has been used to evaluate particle sizes and concentrations in liquid suspensions/emulsions [14][15][16]18], and to detect changes in cells or tissues suspended in solutions [16,17] For many cases, the acoustic attenuation spectrum and back scattering amplitude and frequency is used as important evaluation parameters [14][15][16][17]. Most of these studies were carried to evaluate the elastic or rigid spherical particle suspended or floating in the fluid [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

PVDF copolymer transducers used to evaluate microparticle suspensions

Wagle

Decharat

Melandsø

et al. 2014

2014 IEEE International Ultrasonics Symposium

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The ability of using high frequency ultrasonic transducers made from piezoelectric polymers, to characterize microparticle suspensions, has been investigated both in an experimental setup and in a numerical model. Both investigations, which consider microparticles settled on a glass substrate, show that the backscattered frequency spectra contain a number of minima values arising from wave resonances in the microparticles. The locations of these resonances are in the experiments, found to be independent of the particle concentration, but strongly dependent on the particle size. A comparison to previous results for floating microspheres, show that the material properties of the glass substrate, also has to be included for obtaining the correct resonance frequencies for settled particles

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

PVDF copolymer transducers used to evaluate microparticle suspensions

Wagle

Decharat

Melandsø

et al. 2014

2014 IEEE International Ultrasonics Symposium

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“…Anhand dieses Empfangssignals soll die disperse Phase abhängig von der Schallfrequenz sowie der Konzentration und Größe der Füllstoffpartikel analysiert werden. [20,21]. Bei logarithmischer Skalierung der Standardabweichung kann der in Bild 6 gezeigte Verlauf abschnittsweise durch eine lineare Funktion approximiert werden:…”

Section: Ultraschall-methodenunclassified

P3.1 - Inline-Analyse der Dispergiergüte von Kunststoff- Compounds

Wöckel¹,

Arndt²,

Steinmann³

2015

Tagungsband

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“…Values in different suspensions, e.g. kaolin clay slurries [31], clay sediments [32,33], cornstarch [34], glass [35], were therefore examined to find a convenient one. In the weight range of 1-5%, the differences in sound speed may be ignored and the values are almost equal to that in water (1496 m/s at 25°C) which was consequently used for the calculation.…”

Section: Ultrasound Applicationmentioning

confidence: 99%

Optimization of hydrostatic pressure at varied sonication conditions – power density, intensity, very low frequency – for isothermal ultrasonic sludge treatment

Delmas

Barthe

et al. 2015

Ultrasonics Sonochemistry

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This work aims at investigating for the first time the key sonication (US) parameters: power density (DUS), intensity (IUS), and frequency (FS) - down to audible range, under varied hydrostatic pressure (Ph) and low temperature isothermal conditions (to avoid any thermal effect). The selected application was activated sludge disintegration, a major industrial US process. For a rational approach all comparisons were made at same specific energy input (ES, US energy per solid weight) which is also the relevant economic criterion. The decoupling of power density and intensity was obtained by either changing the sludge volume or most often by changing probe diameter, all other characteristics being unchanged. Comprehensive results were obtained by varying the hydrostatic pressure at given power density and intensity. In all cases marked maxima of sludge disintegration appeared at optimum pressures, which values increased at increasing power intensity and density. Such optimum was expected due to opposite effects of increasing hydrostatic pressure: higher cavitation threshold then smaller and fewer bubbles, but higher temperature and pressure at the end of collapse. In addition the first attempt to lower US frequency down to audible range was very successful: at any operation condition (DUS, IUS, Ph, sludge concentration and type) higher sludge disintegration was obtained at 12 kHz than at 20 kHz. The same values of optimum pressure were observed at 12 and 20 kHz. At same energy consumption the best conditions - obtained at 12 kHz, maximum power density 720 W/L and 3.25 bar - provided about 100% improvement with respect to usual conditions (1 bar, 20 kHz). Important energy savings and equipment size reduction may then be expected.

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Particle characterization in highly concentrated suspensions by ultrasound scattering method

Cited by 20 publications

References 7 publications

PVDF copolymer transducers used to evaluate microparticle suspensions

PVDF copolymer transducers used to evaluate microparticle suspensions

P3.1 - Inline-Analyse der Dispergiergüte von Kunststoff- Compounds

Optimization of hydrostatic pressure at varied sonication conditions – power density, intensity, very low frequency – for isothermal ultrasonic sludge treatment

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