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

Xu, Wenchao; Großhans, Holger

doi:10.1016/j.jlp.2022.104970

Cited by 5 publications

(1 citation statement)

References 19 publications

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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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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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Spatially resolved measurement of the electrostatic charge of turbulent powder flows

Xu,

Jantač,

Matsuyama

et al. 2024

Exp Fluids

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This article reports on measurements of the electrostatic charge of particles in a turbulent duct flow. In contrast to previous charge measurements, which do not apply to turbulent flows or give only the sum of all particles’ charges, the new method resolves the charge of a turbulent powder flow spatially. The experiment consists of a particle tracking velocimetry (PTV) system and electrode plates that generate an electric field. By comparing particle velocities and accelerations with and without the electric field, the time-averaged local particle charge profile is derived. Spatially resolving the charge profiles unveiled bipolar particle flow. The average of the charge profiles agreed well with a conventional Faraday pail measurement, demonstrating the accuracy of our measurements. However, the peak value of the charge profiles was 76 times higher than the average of the particles’ charge.

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Unmasking hidden ignition sources: A new approach to finding extreme charge peaks in powder processing

Grosshans,

Xu,

Jantač

et al. 2024

Journal of Loss Prevention in the Process Industries

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

Cited by 5 publications

References 19 publications

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

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

Spatially resolved measurement of the electrostatic charge of turbulent powder flows

Unmasking hidden ignition sources: A new approach to finding extreme charge peaks in powder processing

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

Cited by 5 publications

References 19 publications

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

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

Spatially resolved measurement of the electrostatic charge of turbulent powder flows

Unmasking hidden ignition sources: A new approach to finding extreme charge peaks in powder processing

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Product

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

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