Simulation of PMMA powder flow electrification using a new charging model based on single-particle experiments

Großhans, Holger; Xu, Wenchao; Matsuyama, Tatsushi

doi:10.1016/j.ces.2022.117623

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…Figure 1 illustrates the schematics of our enhanced experimental facility, an upgrade from our previous setup [8]. The key components include a square-shaped test duct, an air blower, a powder feeder, and a Faraday cage.…”

Section: Experiments Setup and Measurementmentioning

confidence: 99%

Polarity switch of PMMA powder transported through a PMMA duct

Xu,

Grosshans

2024

J. Phys.: Conf. Ser.

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During pneumatic conveying, powder electrifies rapidly due to the high flow velocities. In our experiments, the particles even charge if the conveying duct is made of the same material, which might be caused by triboelectrification between two asymmetric contact surfaces. Surprisingly, we found the airflow rate to determine the polarity of the overall powder charge. This study investigates the charging of microscale PMMA particles in turbulent flows passing through a square PMMA duct. The particles are spherical and monodisperse. A Faraday at the duct outlet measured the total charge of the particles. At low flow velocities, the particles charged negatively after passing through the duct. However, the powder’s overall charge switched to a positive polarity when increasing the flow velocity.

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Section: Experiments Setup and Measurementmentioning

confidence: 99%

Polarity switch of PMMA powder transported through a PMMA duct

Xu,

Grosshans

2024

J. Phys.: Conf. Ser.

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“…Triboelectric charging causes a build-up of charge in particulate systems. In industrial environments, the excessive build-up causes unwanted agglomeration and wall-sheeting in the fluidized beds [1][2][3][4][5], pneumatic conveyors [6][7][8][9][10], or during powder handling in general [11]. This is an especially severe problem in the pharmaceutical industry [12][13][14][15] because the formulation of powders is strictly given and often cannot be changed to reduce the charging.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Reynolds number from Re_τ = 150 to 210 on size-dependent bipolar charging

Jantač,

Grosshans

2024

J. Phys.: Conf. Ser.

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We recently found wall-bounded turbulence to suppress and control bipolar triboelectric charging of particles of identical material. This control is due to fluid modifying the motion of light particles. Thus, the particles’ charge distribution depends on their Stokes number distribution. More specifically, fluid forces narrow the bandwidth of the charge distribution, and bipolar charging reduces dramatically. Consequently, not the smallest but mid-sized particles collect the most negative charge. However, the influence of the Reynolds number or particle concentration on bipolar charging of polydisperse particles is unknown. This paper presents the charging simulations of same-material particles the in different wall-bounded flows. In a comprehensive study, we vary the Reynolds number from Reτ = 150 to 210 and the particle number density from 4 × 109m-3 to 1 × 1010m-3 to further explore the influence of the carrier flow on bipolar charging. We model charge transfer based on the balance of transferable charge species. Such species can represent adsorbed ions transferred during collisions or free electrons captured into a lower energy state on the other surface. The turbulent flow is modeled via Direct Numerical Simulations (DNS) and is coupled to the particulate phase modeled via the Discrete Element Method (DEM). Overall, our multiphysics approach couples the fluid dynamics, electric field, triboelectric charging, and particle momentum into one complex simulation.

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Experimental study of humidity influence on triboelectric charging of particle-laden duct flows

Großhans

2023

Journal of Loss Prevention in the Process Industries

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Simulation of PMMA powder flow electrification using a new charging model based on single-particle experiments

Cited by 6 publications

References 44 publications

Polarity switch of PMMA powder transported through a PMMA duct

Polarity switch of PMMA powder transported through a PMMA duct

Influence of the Reynolds number from Re_τ = 150 to 210 on size-dependent bipolar charging

Experimental study of humidity influence on triboelectric charging of particle-laden duct flows

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Simulation of PMMA powder flow electrification using a new charging model based on single-particle experiments

Cited by 6 publications

References 44 publications

Polarity switch of PMMA powder transported through a PMMA duct

Polarity switch of PMMA powder transported through a PMMA duct

Influence of the Reynolds number from Reτ = 150 to 210 on size-dependent bipolar charging

Experimental study of humidity influence on triboelectric charging of particle-laden duct flows

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Product

Resources

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Influence of the Reynolds number from Re_τ = 150 to 210 on size-dependent bipolar charging