Application of an electrodynamic balance to the study of particle-fluid interactions |
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| Authors: | S. R. Kale M. Ramezan R. J. Anderson |
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| Affiliation: | (1) Dept. of Mechanical and Aerospace Engineering, West Virginia University, 26506-6101 Morgantown, WV, USA;(2) Present address: Dept. of Mechanical Engineering, Indian Institute of Technology, 110016 New Delhi, India;(3) Burns & Roe Services Corporation, P.O. Box 18288, 15236-0288 Pittsburgh, PA, USA;(4) U.S. Dept. of Energy, Morgantown Energy Technology Center, 26507-0880 Morgantown, WV, USA |
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| Abstract: | An electrodynamic balance was used to study the aerodynamics and mass transfer characteristics of spherical and nonspherical particles up to 200  m in size. The balance uses an electric field established by a DC potential to a pair of end electrodes and an AC potential to the central electrode to suspend single changed particles. The suspended particle is then subjected to a steady and/or oscillating air jet. Results from this study indicate that the drag coefficient of irregular-shaped particles was greater than that for spheres, and was unaffected by rotation. Measured mass transfer rates for irregular-shaped naphthalene particles were consistently higher than values predicted for equivalent spheres. These results suggest a strong influence of mass transfer on particle shape and particle Reynolds number.List of symbols A project area - d diameter - de area equivalent diameter - FD drag force - FE electrostatic force - g gravitational constant - KB, KB balance constants - k1, k2 calibration constants - m mass - P pixel count - q charge - Re Reynolds number - U jet velocity - VDC balance DC voltage - VDC,O balance DC voltage without air flow -  particle density - a density of air - v viscosity of air |
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