Integrated DEM–CFD modeling of the contact charging of pneumatically conveyed powders

M.W. Korevaar, J.T. Padding, Martin Anton van der Hoef, J.A.M. Kuipers

Research output: Contribution to journalArticleAcademicpeer-review

34 Citations (Scopus)

Abstract

A model is proposed that incorporates contact charging (also known as triboelectric charging) of pneumatically conveyed powders in a DEM–CFD framework, which accounts for the electrostatic interactions, both between particles and between the particles and conducting walls. The simulation results reveal that the influence of the electrostatic interaction between particle and wall is significant and should not be neglected, since it is found to influence both the spatial distribution of the powder in the duct, and the acquired charge of the particles. We find that there is a critical mean charge: only when the mean charge of the particles exceeds this value, the influence of the electrostatic particle–wall interaction starts to show. This critical charge is independent of the particle concentration in the duct. In this work we use a simple charging model based on the normal impact velocity. A lumped parameter α, dubbed charging efficiency, is introduced to account for the increased contact surface caused by particle rolling on impact due to a tangential component of the impact velocity. The applied model should therefore be viewed as a learning model. In a range of reasonable estimates of α, the charging behavior is non-linear and very sensitive to the value of α; this illustrates the complexity of the system. It also stresses the need for modeling tools to increase our understanding of the particle dynamics and charging behavior.
Original languageEnglish
Pages (from-to)144-156
Number of pages13
JournalPowder technology
Volume258
DOIs
Publication statusPublished - 2014

Fingerprint

Powders
Coulomb interactions
Ducts
Spatial distribution

Keywords

  • METIS-308276
  • IR-95062

Cite this

@article{e8e2086a438c4cc69bae69bf729d07b0,
title = "Integrated DEM–CFD modeling of the contact charging of pneumatically conveyed powders",
abstract = "A model is proposed that incorporates contact charging (also known as triboelectric charging) of pneumatically conveyed powders in a DEM–CFD framework, which accounts for the electrostatic interactions, both between particles and between the particles and conducting walls. The simulation results reveal that the influence of the electrostatic interaction between particle and wall is significant and should not be neglected, since it is found to influence both the spatial distribution of the powder in the duct, and the acquired charge of the particles. We find that there is a critical mean charge: only when the mean charge of the particles exceeds this value, the influence of the electrostatic particle–wall interaction starts to show. This critical charge is independent of the particle concentration in the duct. In this work we use a simple charging model based on the normal impact velocity. A lumped parameter α, dubbed charging efficiency, is introduced to account for the increased contact surface caused by particle rolling on impact due to a tangential component of the impact velocity. The applied model should therefore be viewed as a learning model. In a range of reasonable estimates of α, the charging behavior is non-linear and very sensitive to the value of α; this illustrates the complexity of the system. It also stresses the need for modeling tools to increase our understanding of the particle dynamics and charging behavior.",
keywords = "METIS-308276, IR-95062",
author = "M.W. Korevaar and J.T. Padding and {van der Hoef}, {Martin Anton} and J.A.M. Kuipers",
year = "2014",
doi = "10.1016/j.powtec.2014.03.020",
language = "English",
volume = "258",
pages = "144--156",
journal = "Powder technology",
issn = "0032-5910",
publisher = "Elsevier",

}

Integrated DEM–CFD modeling of the contact charging of pneumatically conveyed powders. / Korevaar, M.W.; Padding, J.T.; van der Hoef, Martin Anton; Kuipers, J.A.M.

In: Powder technology, Vol. 258, 2014, p. 144-156.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Integrated DEM–CFD modeling of the contact charging of pneumatically conveyed powders

AU - Korevaar, M.W.

AU - Padding, J.T.

AU - van der Hoef, Martin Anton

AU - Kuipers, J.A.M.

PY - 2014

Y1 - 2014

N2 - A model is proposed that incorporates contact charging (also known as triboelectric charging) of pneumatically conveyed powders in a DEM–CFD framework, which accounts for the electrostatic interactions, both between particles and between the particles and conducting walls. The simulation results reveal that the influence of the electrostatic interaction between particle and wall is significant and should not be neglected, since it is found to influence both the spatial distribution of the powder in the duct, and the acquired charge of the particles. We find that there is a critical mean charge: only when the mean charge of the particles exceeds this value, the influence of the electrostatic particle–wall interaction starts to show. This critical charge is independent of the particle concentration in the duct. In this work we use a simple charging model based on the normal impact velocity. A lumped parameter α, dubbed charging efficiency, is introduced to account for the increased contact surface caused by particle rolling on impact due to a tangential component of the impact velocity. The applied model should therefore be viewed as a learning model. In a range of reasonable estimates of α, the charging behavior is non-linear and very sensitive to the value of α; this illustrates the complexity of the system. It also stresses the need for modeling tools to increase our understanding of the particle dynamics and charging behavior.

AB - A model is proposed that incorporates contact charging (also known as triboelectric charging) of pneumatically conveyed powders in a DEM–CFD framework, which accounts for the electrostatic interactions, both between particles and between the particles and conducting walls. The simulation results reveal that the influence of the electrostatic interaction between particle and wall is significant and should not be neglected, since it is found to influence both the spatial distribution of the powder in the duct, and the acquired charge of the particles. We find that there is a critical mean charge: only when the mean charge of the particles exceeds this value, the influence of the electrostatic particle–wall interaction starts to show. This critical charge is independent of the particle concentration in the duct. In this work we use a simple charging model based on the normal impact velocity. A lumped parameter α, dubbed charging efficiency, is introduced to account for the increased contact surface caused by particle rolling on impact due to a tangential component of the impact velocity. The applied model should therefore be viewed as a learning model. In a range of reasonable estimates of α, the charging behavior is non-linear and very sensitive to the value of α; this illustrates the complexity of the system. It also stresses the need for modeling tools to increase our understanding of the particle dynamics and charging behavior.

KW - METIS-308276

KW - IR-95062

U2 - 10.1016/j.powtec.2014.03.020

DO - 10.1016/j.powtec.2014.03.020

M3 - Article

VL - 258

SP - 144

EP - 156

JO - Powder technology

JF - Powder technology

SN - 0032-5910

ER -