Discrete element modeling of electrostatic charging of polyethylene powder particles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914170" target="_blank" >RIV/60461373:22340/17:43914170 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.elstat.2017.04.008" target="_blank" >http://dx.doi.org/10.1016/j.elstat.2017.04.008</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.elstat.2017.04.008" target="_blank" >10.1016/j.elstat.2017.04.008</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Discrete element modeling of electrostatic charging of polyethylene powder particles

Popis výsledku v původním jazyce

The contacts of particles with a device wall as well as mutual particle collisions cause the redistribution of charge in systems with powder particles. This, usually undesirable phenomenon known as tribo-electric charging, leads to operational problems and safety risks in industrial systems, e.g., in fluidized bed polymerization reactors. We focus on the charging of polyethylene powder particles caused by the particle-particle interactions. Our model utilizes the Discrete Element Method (DEM) for the description of the particle motion and involves the balance of transferable charged species to quantify the tribo-electric charging of particles in contact. The model predicts the charging dynamics of polyethylene powder particles in systems of various particle size distributions (PSD) and addresses the influence of segregation of particles on charging. Our simulation results are in agreement with two general trends in charging that are often observed in both industrial and naturally-occurring particulate systems: (i) Charging is most pronounced in systems with wide PSD and (ii) small particles charge mostly negatively, whereas big particles typically carry positive charge. Subsequently, our results suggest that particle segregation plays an important role in the charging dynamics of particulate systems, as segregation of particles of different sizes can alter PSD locally. It is important to include electrostatic forces in charging models, especially in systems that exhibit significant charging. Specifically, electrostatic attraction among unlike charged particles leads to the &apos;orbiting motion&apos; of particles that is followed by the formation of particle aggregates.

Název v anglickém jazyce

Discrete element modeling of electrostatic charging of polyethylene powder particles

Popis výsledku anglicky

The contacts of particles with a device wall as well as mutual particle collisions cause the redistribution of charge in systems with powder particles. This, usually undesirable phenomenon known as tribo-electric charging, leads to operational problems and safety risks in industrial systems, e.g., in fluidized bed polymerization reactors. We focus on the charging of polyethylene powder particles caused by the particle-particle interactions. Our model utilizes the Discrete Element Method (DEM) for the description of the particle motion and involves the balance of transferable charged species to quantify the tribo-electric charging of particles in contact. The model predicts the charging dynamics of polyethylene powder particles in systems of various particle size distributions (PSD) and addresses the influence of segregation of particles on charging. Our simulation results are in agreement with two general trends in charging that are often observed in both industrial and naturally-occurring particulate systems: (i) Charging is most pronounced in systems with wide PSD and (ii) small particles charge mostly negatively, whereas big particles typically carry positive charge. Subsequently, our results suggest that particle segregation plays an important role in the charging dynamics of particulate systems, as segregation of particles of different sizes can alter PSD locally. It is important to include electrostatic forces in charging models, especially in systems that exhibit significant charging. Specifically, electrostatic attraction among unlike charged particles leads to the &apos;orbiting motion&apos; of particles that is followed by the formation of particle aggregates.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA16-07898S" target="_blank" >GA16-07898S: Aglomerace částic polyolefinů studovaná na meso-měřítku</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Electrostatics

ISSN

0304-3886

e-ISSN

—

Svazek periodika

87

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

150-157

Kód UT WoS článku

000405762900016

EID výsledku v databázi Scopus

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