Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Analysis of Characteristics on the Static Electricity by Streaming Electrification

유동대전에 의한 정전기 특성 분석

  • Kim, Gil-Tae (Department of Mechanical Engineering, Pusan National University) ;
  • Lee, Jae-Keun (Department of Mechanical Engineering, Pusan National University)
  • Published : 2005.09.30
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Abstract

The static electricity by thinner flow and discharge energy is investigated experimentally for the purpose of preventing the electrostatic discharge and damage. Test system for evaluating streaming electrification consists of a teflon pipe, a reservoir tank a pump, flowmeters and an electrometer. When dielectric liquid flows through a pipe from one vessel to another, the potential difference generated in the collecting vessel is due to the accumulation of charges. These charges result from the convection of a part of the electrical double layer existing in the tube at the contact between the liquid and the inner wall. When the fluid velocity increases, the electric current increases proportionally. The charging current and accumulated charges by streaming electrification at the thinner velocity of 40cm/s are measured a range of 5 nA and $0.27{\mu}C$ respectively. This amount of static discharge energy generated by streaming electrification is enough to ignite flammable solvent. Therefore surface electric potential should decrease by using electrostatic shielding and ground.

Keywords

References

  1. Watanabe, S., et al, 'Effect of the Liquid Property on the Streaming Electrification n-Alcohol', IEEE transactions, Vol. 103-A, No. 6, pp. 315$\mu$322, 1983
  2. Huh, C. S., Jeong, J. I., 'Streaming Current of Thin Insulating Pipe under Electric Field', IEEE transactions on dielectric and electrical insulation, Vol. 5, No. 2, pp. 199$\mu$203, 1998
  3. Kwak, H.R., Kweon, D.J., Son, C.K., 'A Study onthe Static Electrification for E.H.V. Power Transformers Using a Spinning Cylinder', J. of the Industrial Technology Research Institute Soong-Sil University, Vol. 23, pp. 41$\mu$49, 1993
  4. Kim, D.S., Kweon, D.J., Kang, C.G., 'Electrification Tendency of Oil Addong Moisture and Dust', J. of the KIIEE, Vol. 6, No. 5, pp. 50$\mu$56, 1992
  5. http://www.ece.rochester.edu/-jones/demos/nomogram. html
  6. NFPA, 'NFPA 33 Standard for Spray Application Using Flammable or Combustible Materials 2000 Edition', Nation Fire Protection Association, 2002
  7. W, M. Bustin, W.G. Dukek, 'Electrostatic Hazards in the Petroleum Industry', Research Studies Press LTD, 1993
  8. McAteer, O.J., 1990, 'Electrostatic Discharge Control', McGraw-Hill Publishing Company
  9. Chang, J. S., and Kelly, A. J., 'Hand- book of Electrostatic Processes', Marcel Dekker, Inc., 1995