Suppression and Control of Bipolar Powder Charging by Turbulence
arXiv:2303.13882 · doi:10.1103/PhysRevLett.132.054004
Abstract
Current models predict particles of the same material but different sizes to charge bipolar upon contacts; the resulting charge peaks endanger process safety. However, we found wall-bounded turbulence to suppress the powder's electrostatic charging. Aerodynamic forces skew the collision frequency and narrow the charge distribution's bandwidth. Bipolar charging reduces, especially in moderately polydisperse systems of a low Stokes number. Not the smallest but mid-sized particles charge most negatively. Moreover, turbulence separates charge, producing pockets of high electric potential in low-vorticity regions.
arXiv comment6 pages, 3 figures
References in corpus (3)
- Size-dependent same-material tribocharging in insulating grains
- Single-collision statistics reveal a global mechanism driven by sample history for contact electrification in granular media
- Asymmetries in triboelectric charging: generalizing mosaic models to different-material samples and sliding contacts