대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제26권10호
  • /
  • Pages.1451-1457
  • /
  • 2002
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지
DOI QR코드

DOI QR Code

전기수력학적 분무에서 노즐재질이 입경분포에 미치는 영향

Effect of Nozzle Material on Drop Size Distribution in Electrohydrodynamic Spraying

  • 김명찬 (한국과학기술원 기계공학과) ;
  • 이상용 (한국과학기술원 기계공학과)
  • 발행 : 2002.10.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

When an aqueous liquid such as water having high electric conductivity and high surface tension is discharged from a nozzle under a strong DC electric field, fine drops ranging from 30 to 450 microns can be obtained only through the spindle mode. In the present study, effects of the electric conductivity and the surface wettability of nozzle materials on formation of drops with this mode were investigated. For that, three nozzles with the same size but with different materials were prepared and tested; a stainless steel needle, and a plain and a metal (gold)-coated (except for the tip portion) silica needles. Uniform drops were obtained with the gold-coated silica nozzle over the wider range of the DC voltage input. That is, formation of the liquid cone and detachment of the liquid spindle (ligament) can be more stabilized and frequent with the needles having high electric conductivity but with low surface wettability at their tips.

키워드

참고문헌

  1. Lohmann, M., Beyerand, H. and Schmidt-Ott, A., 1997, 'Size and Charge Distribution of Liquid Metal Electrospray Generated Particles,' J. Aerosol Sci., Vol. 28, pp. s349-s350 https://doi.org/10.1016/S0021-8502(97)85175-0
  2. Atten, A. and Oliveri, S., 1992, 'Charging of Drops Formed by Circular Jet Breakup,' J. Electrostatics, Vol. 29, pp. 73-91 https://doi.org/10.1016/0304-3886(92)90007-G
  3. Kidd, P. W., 1968, 'Parametric Studies with a Single-Needle Colloid Thruster,' J. Spacecraft, Vol. 5, No. 9, pp. 1034-1039 https://doi.org/10.2514/3.29417
  4. Borra, J-P., Camelot, D., Marijinissen , J. C. M. and Scarlett, B., 1997, 'A New Production Process of Powders with Defined Properties by Electro-hydrodynamic Atomization of Liquids and Post-Production Electrical Mixing,' J. Electrostatics, Vol. 40&41, pp. 633-638 https://doi.org/10.1016/S0304-3886(97)00065-X
  5. Fu, D., 1995, 'Processing of Porcelain Enamel Glass Powders for Electrostatic Spraying,' Powder Technolgy, Vol. 85, pp. 65-69 https://doi.org/10.1016/0032-5910(95)03004-S
  6. Hoyer, B., Sorensen, G., Jensen, N., Nielsen, D. B. and Larsen, B., 1996, 'Electrostatic Spraying: A Novel Technique for Preparation of Polymer Coatings on Electrodes,' Anal. Chem., Vol. 68, pp. 3840-3844 https://doi.org/10.1021/ac9605509
  7. Zomeren, A. A. V., Kelder, E. M., Marijnissen, J. C. M. and Schoonman, J., 1994, 'The Production of Thin Films of $LiMn_2O_4$ by Electrospraying,' J. Aerosol Sci., Vol. 25, No. 6, pp. 1229-1235 https://doi.org/10.1016/0021-8502(94)90211-9
  8. Kim, M. C., Lee, S. Y., Kim, S. S. and Kim, Y. D., 2001, 'Generation of Uniform Fine Droplets under Spindle Mode in Electrohydrodynamic Atomization,' Trans. KSME, Vol. 25, No. 7, pp. 923-932 (in Korean)
  9. Kim, J. Y., Chu, J. H. and Lee, S. Y., 1999, 'Improvement of Image Processing Technique for Drop Size Measurement,' Atomization and Sprays, Vol. 9, pp. 313-329 https://doi.org/10.1615/AtomizSpr.v9.i3.50
  10. Cloupeau, M. and Prunet-Foch, B., 1990, 'Electrostatic Spraying of Liquids: Main Functioning Modes,' J. Electrostatics, Vol. 25, pp. 165-184 https://doi.org/10.1016/0304-3886(90)90025-Q
  11. Chang, J., Lawless, P. A. and Yamamoto, T., 1991, 'Corona Discharge Processes,' IEEE Transactions on Plasma Science, Vol. 19, No. 6, pp. 1152-1166 https://doi.org/10.1109/27.125038
  12. Sato, M., Tkahashi, H., Awazu, M. and Ohshima, T., 1991, 'Production of Ultra-Uniformly-Sized Silica Particles by Applying as Superimposed on dc Voltage,' J. Electrostatics, Vol. 46, pp. 171-176 https://doi.org/10.1016/S0304-3886(99)00013-3