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The Journal of the Royal Society of Thailand Vol. 41 No. 3 July-September 2016 56 Abstract Hydrodynamics of Electrostatic Charge on Polypropylene in Fluidized Bed Somsak Damronglerd Fellow of the Academy of Science, The Royal Society of Thailand Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok Dimitri Gidaspow Department of Chemical and Biological Engineering, Illinois Institute of Technology, Chicago, IL 60616, USA Piyawan Tiyapaiboonchai Department of Chemical Technology, Faculty of Science, Chulalongkorn University, Bangkok Experiments were performed in a double jacket gas-solid fluidized bed to investigate the process and degree of electrification in the fluidized bed. Five copper rings attached to the inner column wall were connected to a picoammeter for measuring the electrical current at different vertical levels. It was found that both positive and negative electrical currents were traced in the whole bed. The magnitude of the positive current was observed at the bottom of the bed while at the top part of the bed the magnitude of the negative current was found. The influence of the initial bed height, fluidization velocity, and gas temperature played a significant role on the charge dissipation. Also, the degree of electrification increased with initial bed height and gas velocity. Keywords: triboelectric, electrification current, polypropylene, fluidized bed การเกิดประจุไฟฟ้าสถิตบนเม็ดพอลิโพรพิลีนในฟลูอิไดซ์เบด