Comparison of agglomeration behavior of fine particles in liquid among various mixing operations

Syunsuke Sumitomo, Kota Yoshitomi, Azhar Uddin, Yoshiei Katou

Research output: Contribution to journalArticle

Abstract

In order to compare the agglomeration and breakup behavior of fine particles in liquid by various mixing operations, model experiments were carried out and a mathematical model was developed and compared with the experimental results. Three kinds of mixing operations were examined: mechanical stirring by impeller (impeller), gas blow mixing (gas), and gas and liquid jet blow mixing by RH degasser (RH). Polymethylmethacrylate (PMMA) particles of 2.8×10−6 m in mean diameter and 3.0×103 mol·m−3 of KCl solution were used in the experiment as solid and liquid phases, respectively. Total number of PMMA particles at each mixing process decreased with the increasing time, although the agglomeration rate decreased. The PMMA agglomeration rate at the same mixing energy input in the liquid was in the following decreasing order: impeller, gas, and RH mixing. The experimental results of the impeller mixing were able to be explained by a turbulence agglomeration model. A breakup model of particles was newly developed assuming that the agglomerated PMMA particles adhered to the surface of bubbles during bubble floating in the liquid was divided into two pieces on the gas/liquid free surface at the moment of bubble bursting. By introducing this breakup model in addition to the agglomeration one, the calculation results for both of the gas and RH mixing agreed well with the experiment.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalISIJ International
Volume58
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

Fingerprint

Agglomeration
Liquids
Gases
Polymethyl Methacrylate
Bubbles (in fluids)
Getters
Drop breakup
Experiments
Turbulence
Mathematical models

Keywords

  • Gas blow mixing
  • Mechanical stirring
  • Particle agglomeration
  • Particles breakup
  • RH degassing

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Comparison of agglomeration behavior of fine particles in liquid among various mixing operations. / Sumitomo, Syunsuke; Yoshitomi, Kota; Uddin, Azhar; Katou, Yoshiei.

In: ISIJ International, Vol. 58, No. 1, 01.01.2018, p. 1-9.

Research output: Contribution to journalArticle

@article{508e3f9560e54345b1ba21f996f5c8c7,
title = "Comparison of agglomeration behavior of fine particles in liquid among various mixing operations",
abstract = "In order to compare the agglomeration and breakup behavior of fine particles in liquid by various mixing operations, model experiments were carried out and a mathematical model was developed and compared with the experimental results. Three kinds of mixing operations were examined: mechanical stirring by impeller (impeller), gas blow mixing (gas), and gas and liquid jet blow mixing by RH degasser (RH). Polymethylmethacrylate (PMMA) particles of 2.8×10−6 m in mean diameter and 3.0×103 mol·m−3 of KCl solution were used in the experiment as solid and liquid phases, respectively. Total number of PMMA particles at each mixing process decreased with the increasing time, although the agglomeration rate decreased. The PMMA agglomeration rate at the same mixing energy input in the liquid was in the following decreasing order: impeller, gas, and RH mixing. The experimental results of the impeller mixing were able to be explained by a turbulence agglomeration model. A breakup model of particles was newly developed assuming that the agglomerated PMMA particles adhered to the surface of bubbles during bubble floating in the liquid was divided into two pieces on the gas/liquid free surface at the moment of bubble bursting. By introducing this breakup model in addition to the agglomeration one, the calculation results for both of the gas and RH mixing agreed well with the experiment.",
keywords = "Gas blow mixing, Mechanical stirring, Particle agglomeration, Particles breakup, RH degassing",
author = "Syunsuke Sumitomo and Kota Yoshitomi and Azhar Uddin and Yoshiei Katou",
year = "2018",
month = "1",
day = "1",
doi = "10.2355/isijinternational.ISIJINT-2017-190",
language = "English",
volume = "58",
pages = "1--9",
journal = "ISIJ International",
issn = "0915-1559",
publisher = "Iron and Steel Institute of Japan",
number = "1",

}

TY - JOUR

T1 - Comparison of agglomeration behavior of fine particles in liquid among various mixing operations

AU - Sumitomo, Syunsuke

AU - Yoshitomi, Kota

AU - Uddin, Azhar

AU - Katou, Yoshiei

PY - 2018/1/1

Y1 - 2018/1/1

N2 - In order to compare the agglomeration and breakup behavior of fine particles in liquid by various mixing operations, model experiments were carried out and a mathematical model was developed and compared with the experimental results. Three kinds of mixing operations were examined: mechanical stirring by impeller (impeller), gas blow mixing (gas), and gas and liquid jet blow mixing by RH degasser (RH). Polymethylmethacrylate (PMMA) particles of 2.8×10−6 m in mean diameter and 3.0×103 mol·m−3 of KCl solution were used in the experiment as solid and liquid phases, respectively. Total number of PMMA particles at each mixing process decreased with the increasing time, although the agglomeration rate decreased. The PMMA agglomeration rate at the same mixing energy input in the liquid was in the following decreasing order: impeller, gas, and RH mixing. The experimental results of the impeller mixing were able to be explained by a turbulence agglomeration model. A breakup model of particles was newly developed assuming that the agglomerated PMMA particles adhered to the surface of bubbles during bubble floating in the liquid was divided into two pieces on the gas/liquid free surface at the moment of bubble bursting. By introducing this breakup model in addition to the agglomeration one, the calculation results for both of the gas and RH mixing agreed well with the experiment.

AB - In order to compare the agglomeration and breakup behavior of fine particles in liquid by various mixing operations, model experiments were carried out and a mathematical model was developed and compared with the experimental results. Three kinds of mixing operations were examined: mechanical stirring by impeller (impeller), gas blow mixing (gas), and gas and liquid jet blow mixing by RH degasser (RH). Polymethylmethacrylate (PMMA) particles of 2.8×10−6 m in mean diameter and 3.0×103 mol·m−3 of KCl solution were used in the experiment as solid and liquid phases, respectively. Total number of PMMA particles at each mixing process decreased with the increasing time, although the agglomeration rate decreased. The PMMA agglomeration rate at the same mixing energy input in the liquid was in the following decreasing order: impeller, gas, and RH mixing. The experimental results of the impeller mixing were able to be explained by a turbulence agglomeration model. A breakup model of particles was newly developed assuming that the agglomerated PMMA particles adhered to the surface of bubbles during bubble floating in the liquid was divided into two pieces on the gas/liquid free surface at the moment of bubble bursting. By introducing this breakup model in addition to the agglomeration one, the calculation results for both of the gas and RH mixing agreed well with the experiment.

KW - Gas blow mixing

KW - Mechanical stirring

KW - Particle agglomeration

KW - Particles breakup

KW - RH degassing

UR - http://www.scopus.com/inward/record.url?scp=85040736678&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85040736678&partnerID=8YFLogxK

U2 - 10.2355/isijinternational.ISIJINT-2017-190

DO - 10.2355/isijinternational.ISIJINT-2017-190

M3 - Article

AN - SCOPUS:85040736678

VL - 58

SP - 1

EP - 9

JO - ISIJ International

JF - ISIJ International

SN - 0915-1559

IS - 1

ER -