Suspension of solid particles

Rieger, F.; Ditl, Pavel

doi:10.1016/0009-2509(94)e0029-p

Cited by 55 publications

(26 citation statements)

References 8 publications

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“…Our experimental results were correlated with the empirical correlations similar to that proposed by Rieger and Ditl [15].…”

Section: Discussionsupporting

confidence: 87%

“…(9) and (10), there is no influence of the viscosity and the same effect of difference density term. We can also point out that the expressions of Kolar [3] and Zehner, cited by [15] have a similar form as Eq. (9).…”

Section: Unbaffled Tankmentioning

confidence: 84%

“…(unbaffled tank) (15) (baffled tank) These expressions allow one to predict the optimum mixing conditions for the microcapsules formation with a solvent evaporation technique in stirred tanks. …”

Section: Discussionmentioning

confidence: 99%

“…The particles are sieved into several narrow size classifications and the mean diameter, d p , is used to characterize the solid suspension. Takahashi et al [14] and Rieger and Ditl [15] have studied the effect of the particle size on N ms . According to these authors, a critical size, d* p allows one to define two regions where the size of the particles does not have the same effects on the suspension phenomena.…”

Section: Review Of Correlations For Complete Suspension At Minimum Speedmentioning

confidence: 98%

“…5b); in fact, we observe that the residues are distributed around the average value with two particular evolutions. The same method described in previous paragraph is applied to determine the effect of solid concentration with the correlation proposed by Rieger and Ditl [15]. The modified Rieger and Ditl correlation is expressed as following:…”

Section: Baffled Tankmentioning

confidence: 99%

See 4 more Smart Citations

Complete Suspension of Microcapsules in Baffled and Unbaffled Stirred Tanks

Brujes¹,

Legrand

Carnelle

1998

Chem. Eng. Technol.

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The study of rotational speed for complete suspension have been carried out by varying different parameters: density ratio, stirrer diameter, clearance of stirrer, solid particle diameter, and particle concentration. The equations of correlation available in the literature were tested in order to obtain the one giving the best prediction of experimental values. The proposed correlation enables the determination of the minimal rotational speed for complete suspension of microcapsules in a pilot reactor with a good accuracy. The results will be used for the scale up of a microencapsulation process from laboratory to the pilot stirred vessel, for which it is considered that the extrapolation factor is the minimal rotational speed for complete suspension.

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“…Our experimental results were correlated with the empirical correlations similar to that proposed by Rieger and Ditl [15].…”

Section: Discussionsupporting

confidence: 87%

Section: Unbaffled Tankmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Review Of Correlations For Complete Suspension At Minimum Speedmentioning

confidence: 98%

Section: Baffled Tankmentioning

confidence: 99%

See 3 more Smart Citations

Complete Suspension of Microcapsules in Baffled and Unbaffled Stirred Tanks

Brujes¹,

Legrand

Carnelle

1998

Chem. Eng. Technol.

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Stirred Tank Reactors for Chemical Reactions

Pangarkar

2014

Design of Multiphase Reactors

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Resolution of structure characteristics of AE signals in multiphase flow system—From data to information

Wang

Cao

et al. 2009

AIChE Journal

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This investigation was performed to study the underlying structure characteristics of acoustic emission (AE) signals, which could be helpful not only to understand a relatively complete picture of hydrodynamics in multiphase flow systems, but also to extract the most useful information from the original signals with respect to a particular measurement requirement. However, due to AE signals are made up of emission from many acoustic sources at different scales, the resolution of AE signals is often very complicated and appears to be relatively poorly researched. In this study, the structure characteristics of AE signals measured both in gas-solid fluidized bed and liquid-solid stirred tank were researched in detail by resorting to wavelet transform and rescaled range analysis. A general criterion was proposed to resolve AE signals into three physicalrelated characteristic scales, i.e., microscale, mesoscale, and macroscale. Multiscale resolution of AE signals implied that AE signals in microscale represented totally the dynamics of solid phase and could be applied to measure particle-related properties. Furthermore, based on the structure characteristics of AE signals, useful features related to particles motion were extracted to establish two new prediction models, one for on-line measurements of particle size distribution (PSD) and average particle size in gas-solid fluidized bed and the other for on-line measurement of the suspension height in liquid-solid stirred tank. The prediction results indicated that (1) measurements of PSD and average particle size using AE method showed a fairly good agreement with that using sieve method both for laboratory scale and plant scale fluidized beds, and (2) measurements of the suspension height using AE method showed a fairly good agreement with that using visual method. The results thus validated that the extracted features based on analyses of structure characteristics of AE signals were very useful for establishing effective on-line measurement models with respect to some particular applications.

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Suspension of solid particles

Cited by 55 publications

References 8 publications

Complete Suspension of Microcapsules in Baffled and Unbaffled Stirred Tanks

Complete Suspension of Microcapsules in Baffled and Unbaffled Stirred Tanks

Stirred Tank Reactors for Chemical Reactions

Resolution of structure characteristics of AE signals in multiphase flow system—From data to information

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