Experimental study of humidity influence on triboelectric charging of particle-laden duct flows |
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Institution: | 1. Laboratoire de Génie Electrique, B.P. 401, Université 8 Mai 1945-Guelma, Algérie 24000, Algeria;2. Institut Pprime, CNRS, Université de Poitiers, ISAE-ENSMA, F86962 Futuroscope, France |
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Abstract: | Electrostatic charge on powders arises during pneumatic transport due to particle–particle and particle–surface interactions via triboelectrification. This is a potential threat to the safety of industrial production and the source of numerous fires and dust explosions in the past. Triboelectric charges are affected by environmental conditions, such as ambient temperature and relative humidity. In this work, we experimentally investigated the influence of ambient humidity on the particle charge of gas–solid flows in a square-shaped duct. Monodisperse PMMA particles are fed into a fully developed airflow in a PMMA duct and then pass through a metallic duct section. The charge of particles is measured at the outlet of the metallic duct via a Faraday cup. By measuring the electrostatic charge under various environmental conditions, we observed that the electrostatic charge first increases with the humidity and then decreases when the humidity becomes higher. |
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Keywords: | Electrostatics Particle charge Triboelectricity Particle-laden flow |
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