A numerical investigation into the influence of mixing on orthokinetic agglomeration

ED Hollander*, JJ Derksen, OSL Bruinsma, GM van Rosmalen, HEA van den Akker

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The scale-up behaviour of orthokinetic agglomeration in a 1, 10, 100 and 1000 liter vessel was investigated numerically, using constant Re-number, constant power input and constant impeller tip speed as scale rules. It was found that scale-up at constant )over bar> yielded the most constant results. At increasing volume, the influence of the macroscopic mixing time scale could be seen.

In practice, laboratory scale experiments to determine agglomeration rate constants are carried out in stirred tanks of 1-10 liter. The results of this study indicate that this flow system exhibits too high turbulent intensities for agglomeration to occur readily. This is consistent with the experimental observation that small stirred tanks agglomerate badly, while large reactors do agglomerate. Laboratory scale stirred tanks will therefore be less suited for measuring these kinetic data.

Original languageEnglish
Title of host publication10TH EUROPEAN CONFERENCE ON MIXING
EditorsHEA VanDenAkker, JJ Derksen
PublisherELSEVIER SCIENCE BV
Pages221-229
Number of pages9
ISBN (Print)0-444-50476-1
Publication statusPublished - 2000
Event10th European Conference on Mixing - DELFT, Netherlands
Duration: 2 Jul 20005 Jul 2000

Conference

Conference10th European Conference on Mixing
CountryNetherlands
CityDELFT
Period2/07/005/07/00

Keywords

  • CALCIUM-OXALATE MONOHYDRATE
  • PRECIPITATION
  • AGGREGATION
  • SIMULATIONS
  • DRIVEN

Cite this

Hollander, ED., Derksen, JJ., Bruinsma, OSL., van Rosmalen, GM., & van den Akker, HEA. (2000). A numerical investigation into the influence of mixing on orthokinetic agglomeration. In HEA. VanDenAkker, & JJ. Derksen (Eds.), 10TH EUROPEAN CONFERENCE ON MIXING (pp. 221-229). ELSEVIER SCIENCE BV.

A numerical investigation into the influence of mixing on orthokinetic agglomeration. / Hollander, ED; Derksen, JJ; Bruinsma, OSL; van Rosmalen, GM; van den Akker, HEA.

10TH EUROPEAN CONFERENCE ON MIXING. ed. / HEA VanDenAkker; JJ Derksen. ELSEVIER SCIENCE BV, 2000. p. 221-229.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Hollander, ED, Derksen, JJ, Bruinsma, OSL, van Rosmalen, GM & van den Akker, HEA 2000, A numerical investigation into the influence of mixing on orthokinetic agglomeration. in HEA VanDenAkker & JJ Derksen (eds), 10TH EUROPEAN CONFERENCE ON MIXING. ELSEVIER SCIENCE BV, pp. 221-229, 10th European Conference on Mixing, DELFT, Netherlands, 2/07/00.
Hollander ED, Derksen JJ, Bruinsma OSL, van Rosmalen GM, van den Akker HEA. A numerical investigation into the influence of mixing on orthokinetic agglomeration. In VanDenAkker HEA, Derksen JJ, editors, 10TH EUROPEAN CONFERENCE ON MIXING. ELSEVIER SCIENCE BV. 2000. p. 221-229
Hollander, ED ; Derksen, JJ ; Bruinsma, OSL ; van Rosmalen, GM ; van den Akker, HEA. / A numerical investigation into the influence of mixing on orthokinetic agglomeration. 10TH EUROPEAN CONFERENCE ON MIXING. editor / HEA VanDenAkker ; JJ Derksen. ELSEVIER SCIENCE BV, 2000. pp. 221-229
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abstract = "The scale-up behaviour of orthokinetic agglomeration in a 1, 10, 100 and 1000 liter vessel was investigated numerically, using constant Re-number, constant power input and constant impeller tip speed as scale rules. It was found that scale-up at constant )over bar> yielded the most constant results. At increasing volume, the influence of the macroscopic mixing time scale could be seen.In practice, laboratory scale experiments to determine agglomeration rate constants are carried out in stirred tanks of 1-10 liter. The results of this study indicate that this flow system exhibits too high turbulent intensities for agglomeration to occur readily. This is consistent with the experimental observation that small stirred tanks agglomerate badly, while large reactors do agglomerate. Laboratory scale stirred tanks will therefore be less suited for measuring these kinetic data.",
keywords = "CALCIUM-OXALATE MONOHYDRATE, PRECIPITATION, AGGREGATION, SIMULATIONS, DRIVEN",
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AU - van Rosmalen, GM

AU - van den Akker, HEA

PY - 2000

Y1 - 2000

N2 - The scale-up behaviour of orthokinetic agglomeration in a 1, 10, 100 and 1000 liter vessel was investigated numerically, using constant Re-number, constant power input and constant impeller tip speed as scale rules. It was found that scale-up at constant )over bar> yielded the most constant results. At increasing volume, the influence of the macroscopic mixing time scale could be seen.In practice, laboratory scale experiments to determine agglomeration rate constants are carried out in stirred tanks of 1-10 liter. The results of this study indicate that this flow system exhibits too high turbulent intensities for agglomeration to occur readily. This is consistent with the experimental observation that small stirred tanks agglomerate badly, while large reactors do agglomerate. Laboratory scale stirred tanks will therefore be less suited for measuring these kinetic data.

AB - The scale-up behaviour of orthokinetic agglomeration in a 1, 10, 100 and 1000 liter vessel was investigated numerically, using constant Re-number, constant power input and constant impeller tip speed as scale rules. It was found that scale-up at constant )over bar> yielded the most constant results. At increasing volume, the influence of the macroscopic mixing time scale could be seen.In practice, laboratory scale experiments to determine agglomeration rate constants are carried out in stirred tanks of 1-10 liter. The results of this study indicate that this flow system exhibits too high turbulent intensities for agglomeration to occur readily. This is consistent with the experimental observation that small stirred tanks agglomerate badly, while large reactors do agglomerate. Laboratory scale stirred tanks will therefore be less suited for measuring these kinetic data.

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KW - DRIVEN

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