Suppression and Control of Bipolar Powder Charging by Turbulence
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866916112361324544 |
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| author | Jantač, Simon Grosshans, Holger |
| author_facet | Jantač, Simon Grosshans, Holger |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2303_13882 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Suppression and Control of Bipolar Powder Charging by Turbulence Jantač, Simon Grosshans, Holger Fluid Dynamics 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. |
| title | Suppression and Control of Bipolar Powder Charging by Turbulence |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2303.13882 |