CFD Modeling of Electrostatic Forces in Gas-Solid Fluidized Beds

Abstract

Electrostatic charges in gas-solid fluidized beds are known to influence the bed dynamics, bubble shape and size, particle agglomeration, segregation and entrainment. In practice, accumulation of electrostatic charges in fluidized beds can lead to operational issues. The present work

Effects of external electric field on bubble and charged particle hydrodynamics in a gas–solid fluidized bed

“…2 displays the instantaneous contours of solid volume fraction with unlike charges. At the boundary of the two solid phases, the positively and negatively charged particles attracted each other, driving the particles at both sides to move and assemble towards the square centerline, in agreement with the literature results [24,51]. This testing case showed that the electrostatic model in this work was able to capture the important basic electrostatic phenomenon.…”

“…Numerical simulation provides a viable alternative to study the electrostatic effects in gas-solid fluidized bed. Rokkam et al [2,24] used the Eulerian-Eulerian multi-fluid model coupled with electrostatic model to simulate the bipolar charging phenomenon in a gas-solid fluidized bed. The magnitude of electrostatic force was calculated based on the Lorentz force equation.…”

Computational fluid dynamics and electrostatic modeling of polymerization fluidized-bed reactors

“…9. Instantaneous contours of (a) electric potential, (b) total solids volume fraction at the center and along the bed height at t = 100 s. that sufficiently high charges on the solid phase can cause agglomeration and defluidization in gas-solid fluidized beds [73].…”

Computational and experimental study of electrostatics in gas–solid polymerization fluidized beds

“…Electrostatic charge generation is known to affect the bubble dynamics such as size, shape and also particle elutriation rates (Rokkam et al, 2010). With charge accumulation, process upsets such as defluidization can occur (Hendrickson, 2006;Rokkam et al, 2009;Moughrabiah et al, 2012;Sowinski et al, 2012). Understanding the dynamics of the bed aids in the design and process optimization of such reactors.…”

“…Understanding the dynamics of the bed aids in the design and process optimization of such reactors. In this work the electrostatic model previously developed in Rokkam et al (2009Rokkam et al ( , 2010 is compared with results obtained from experiments performed by Sowinski et al (2010).…”