Effect of contact resistance on bulk resistivity of dry coke beds

Per Anders Eidem, Magne Runde, Merete Tangstad, Jon Arne Bakken, Zongyan Zhou, Aibing Yu

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Measurements show that bulk resistivity of dry coke beds decreases with increasing particle size. A further development of a coke bed model is proposed to explain this correlation. By image analysis, it has been determined that the total porosity increases with increasing particle size. An increased total porosity of the particles decreases the mechanical strength of the particles. In the modeling work, the strength of the coke particles is introduced through Young s modulus. By the use of discrete element method (DEM) modeling of a dry coke bed, the particle-to-particle contact area variation with varying particle size and particle strength has been introduced into a model of the dry coke bed. This was done by the introduction of the concept of the Holm s radius, known from metal contact theory for describing how the contact resistance is affected by the material resistivity and the contact area. By assuming a decrease in the particle strength due to increased porosity of the coke particles with increasing particle size, the calculated bulk resistivity for 7.3-mm particles with a Young s modulus of 1.0 GPa is 5.24?10-3 Om and 3.44?10-3 Om for the 20-mm particles with a Young s modulus of 0.1 GPa. By comparison, the measured bulk resistivity of the Corus coke is 4.67 ? 0.30?10-3 Om for the 5- to 10-mm fraction and 3.71 ? 0.45?10-3 Om for the 15- to 20-mm fraction. The measured contact resistance of Swedish Steel AB (SSAB) coke decreases with increasing contact area size from a contact diameter of 5 mm to a contact diameter of 30 mm. This is probably due to an increasing number of electrical contact spots. When two spheres are in contact, the measured contact resistance is lower compared to the 5-mm-diameter contact, which indicates that the increased contact pressure has lowered the contact resistance. This supports the modeling results.
Original languageEnglish
Pages (from-to)388 - 396
Number of pages9
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume40
Issue number3
DOIs
Publication statusPublished - 2009
Externally publishedYes

Cite this

@article{ecf36a7bdffc419b84b32af6857accde,
title = "Effect of contact resistance on bulk resistivity of dry coke beds",
abstract = "Measurements show that bulk resistivity of dry coke beds decreases with increasing particle size. A further development of a coke bed model is proposed to explain this correlation. By image analysis, it has been determined that the total porosity increases with increasing particle size. An increased total porosity of the particles decreases the mechanical strength of the particles. In the modeling work, the strength of the coke particles is introduced through Young s modulus. By the use of discrete element method (DEM) modeling of a dry coke bed, the particle-to-particle contact area variation with varying particle size and particle strength has been introduced into a model of the dry coke bed. This was done by the introduction of the concept of the Holm s radius, known from metal contact theory for describing how the contact resistance is affected by the material resistivity and the contact area. By assuming a decrease in the particle strength due to increased porosity of the coke particles with increasing particle size, the calculated bulk resistivity for 7.3-mm particles with a Young s modulus of 1.0 GPa is 5.24?10-3 Om and 3.44?10-3 Om for the 20-mm particles with a Young s modulus of 0.1 GPa. By comparison, the measured bulk resistivity of the Corus coke is 4.67 ? 0.30?10-3 Om for the 5- to 10-mm fraction and 3.71 ? 0.45?10-3 Om for the 15- to 20-mm fraction. The measured contact resistance of Swedish Steel AB (SSAB) coke decreases with increasing contact area size from a contact diameter of 5 mm to a contact diameter of 30 mm. This is probably due to an increasing number of electrical contact spots. When two spheres are in contact, the measured contact resistance is lower compared to the 5-mm-diameter contact, which indicates that the increased contact pressure has lowered the contact resistance. This supports the modeling results.",
author = "Eidem, {Per Anders} and Magne Runde and Merete Tangstad and Bakken, {Jon Arne} and Zongyan Zhou and Aibing Yu",
year = "2009",
doi = "10.1007/s11663-009-9235-1",
language = "English",
volume = "40",
pages = "388 -- 396",
journal = "Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science",
issn = "1073-5615",
publisher = "Springer",
number = "3",

}

Effect of contact resistance on bulk resistivity of dry coke beds. / Eidem, Per Anders; Runde, Magne; Tangstad, Merete; Bakken, Jon Arne; Zhou, Zongyan; Yu, Aibing.

In: Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 40, No. 3, 2009, p. 388 - 396.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Effect of contact resistance on bulk resistivity of dry coke beds

AU - Eidem, Per Anders

AU - Runde, Magne

AU - Tangstad, Merete

AU - Bakken, Jon Arne

AU - Zhou, Zongyan

AU - Yu, Aibing

PY - 2009

Y1 - 2009

N2 - Measurements show that bulk resistivity of dry coke beds decreases with increasing particle size. A further development of a coke bed model is proposed to explain this correlation. By image analysis, it has been determined that the total porosity increases with increasing particle size. An increased total porosity of the particles decreases the mechanical strength of the particles. In the modeling work, the strength of the coke particles is introduced through Young s modulus. By the use of discrete element method (DEM) modeling of a dry coke bed, the particle-to-particle contact area variation with varying particle size and particle strength has been introduced into a model of the dry coke bed. This was done by the introduction of the concept of the Holm s radius, known from metal contact theory for describing how the contact resistance is affected by the material resistivity and the contact area. By assuming a decrease in the particle strength due to increased porosity of the coke particles with increasing particle size, the calculated bulk resistivity for 7.3-mm particles with a Young s modulus of 1.0 GPa is 5.24?10-3 Om and 3.44?10-3 Om for the 20-mm particles with a Young s modulus of 0.1 GPa. By comparison, the measured bulk resistivity of the Corus coke is 4.67 ? 0.30?10-3 Om for the 5- to 10-mm fraction and 3.71 ? 0.45?10-3 Om for the 15- to 20-mm fraction. The measured contact resistance of Swedish Steel AB (SSAB) coke decreases with increasing contact area size from a contact diameter of 5 mm to a contact diameter of 30 mm. This is probably due to an increasing number of electrical contact spots. When two spheres are in contact, the measured contact resistance is lower compared to the 5-mm-diameter contact, which indicates that the increased contact pressure has lowered the contact resistance. This supports the modeling results.

AB - Measurements show that bulk resistivity of dry coke beds decreases with increasing particle size. A further development of a coke bed model is proposed to explain this correlation. By image analysis, it has been determined that the total porosity increases with increasing particle size. An increased total porosity of the particles decreases the mechanical strength of the particles. In the modeling work, the strength of the coke particles is introduced through Young s modulus. By the use of discrete element method (DEM) modeling of a dry coke bed, the particle-to-particle contact area variation with varying particle size and particle strength has been introduced into a model of the dry coke bed. This was done by the introduction of the concept of the Holm s radius, known from metal contact theory for describing how the contact resistance is affected by the material resistivity and the contact area. By assuming a decrease in the particle strength due to increased porosity of the coke particles with increasing particle size, the calculated bulk resistivity for 7.3-mm particles with a Young s modulus of 1.0 GPa is 5.24?10-3 Om and 3.44?10-3 Om for the 20-mm particles with a Young s modulus of 0.1 GPa. By comparison, the measured bulk resistivity of the Corus coke is 4.67 ? 0.30?10-3 Om for the 5- to 10-mm fraction and 3.71 ? 0.45?10-3 Om for the 15- to 20-mm fraction. The measured contact resistance of Swedish Steel AB (SSAB) coke decreases with increasing contact area size from a contact diameter of 5 mm to a contact diameter of 30 mm. This is probably due to an increasing number of electrical contact spots. When two spheres are in contact, the measured contact resistance is lower compared to the 5-mm-diameter contact, which indicates that the increased contact pressure has lowered the contact resistance. This supports the modeling results.

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U2 - 10.1007/s11663-009-9235-1

DO - 10.1007/s11663-009-9235-1

M3 - Article

VL - 40

SP - 388

EP - 396

JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science

SN - 1073-5615

IS - 3

ER -