A Study on the Aerodynamic Diameter of Flame-generated Aggregates

화염에서 생성된 응집체의 공기역학적 입경에 대한 연구

  • 권문석 (삼성 SDI M/E 사업부) ;
  • 박형호 (한국과학기술원 대학원 기계공학과) ;
  • 김상수 (한국과학기술원 기계공학과)
  • Published : 2001.06.27

Abstract

The relation between the aerodynamic diameter and some morphological parameters was studied for flame-generated aggregates. $SiO_{2}$ aggregates were generated from $SiCl_{4}$ in premixed methane/air flames. These aggregates were sampled and classified according to their aerodynamic diameter by a cascade impactor; moreover, computer program was developed and tested to find the equivalent area diameter and the fractal dimension of the aggregates. We calculated the parameters from the digitized images of the aggregate TEM micrographs. The aerodynamic diameters of the sampled aggregates were larger than $0.4{\mu}m$ in this experiment. In most cases, fractal dimension of their projection image was very close to 2.0 for these large aggregates. It was found that the equivalent area diameter of these aggregates was approximately three times larger than the Stokes' diameter of them.

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