A numerical investigation into the influence of mixing on orthokinetic agglomeration

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

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

Engineering

Delft University of Technology

Research output: Chapter in Book/Report/Conference proceeding › Published conference 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 language	English
Title of host publication	10TH EUROPEAN CONFERENCE ON MIXING
Editors	HEA VanDenAkker, JJ Derksen
Publisher	ELSEVIER SCIENCE BV
Pages	221-229
Number of pages	9
ISBN (Print)	0-444-50476-1
Publication status	Published - 2000
Event	10th European Conference on Mixing - DELFT, Netherlands Duration: 2 Jul 2000 → 5 Jul 2000

Conference

Conference	10th European Conference on Mixing
Country/Territory	Netherlands
City	DELFT
Period	2/07/00 → 5/07/00

Keywords

CALCIUM-OXALATE MONOHYDRATE
PRECIPITATION
AGGREGATION
SIMULATIONS
DRIVEN

Cite this

@inproceedings{340aced1c069445e930e4422c13a4add,

title = "A numerical investigation into the influence of mixing on orthokinetic agglomeration",

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",

author = "ED Hollander and JJ Derksen and OSL Bruinsma and {van Rosmalen}, GM and {van den Akker}, HEA",

year = "2000",

language = "English",

isbn = "0-444-50476-1",

pages = "221--229",

editor = "HEA VanDenAkker and JJ Derksen",

booktitle = "10TH EUROPEAN CONFERENCE ON MIXING",

publisher = "ELSEVIER SCIENCE BV",

note = "10th European Conference on Mixing ; Conference date: 02-07-2000 Through 05-07-2000",

}

TY - GEN

T1 - A numerical investigation into the influence of mixing on orthokinetic agglomeration

AU - Hollander, ED

AU - Derksen, JJ

AU - Bruinsma, OSL

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.

KW - CALCIUM-OXALATE MONOHYDRATE

KW - PRECIPITATION

KW - AGGREGATION

KW - SIMULATIONS

KW - DRIVEN

M3 - Published conference contribution

SN - 0-444-50476-1

SP - 221

EP - 229

BT - 10TH EUROPEAN CONFERENCE ON MIXING

A2 - VanDenAkker, HEA

A2 - Derksen, JJ

PB - ELSEVIER SCIENCE BV

T2 - 10th European Conference on Mixing

Y2 - 2 July 2000 through 5 July 2000

ER -

A numerical investigation into the influence of mixing on orthokinetic agglomeration

Abstract

Conference

Keywords

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