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RISS 인기검색어
- 검색키워드
- 주제어 : 초기수트(incipient soot) (검색결과 2 건)
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이의주(Eui Ju Lee) 한국가시화정보학회 2004 한국가시화정보학회지 Vol.2 No.1
The physical characteristics of soot near the soot inception point were investigated with various measurements. In-situ measurements of particle size and volume fraction were introduced based on time resolved laser-induced incandescence (TIRE-LII) and laser-induced ion mobility (LIIM). The one has more convenience and accuracy than conventional LII technique and the other works best for particle sizes of a few nanometers at high concentrations in a uniform concentration field. A complementary ex-situ measurement of particle size is nano differential mobility analyzer (Nano-DMA), which recently developed for measuring particle sizes between 2㎚ and 100㎚ and provides high-resolution size information for early soot. Particles will be also collected on transmission electron microscope (TEM) grids using rapid thermophoretic sampling and analyzed for morphology. These measurements will allow fresh and original insight into the characterizing soot inception process. The measured physical properties of incipient soot will clarify the controlling growth mechanism combined with chemical ones, and the dominant mechanism for soot modeling can be deduced from the information.
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WSR 초기수트 조건에서의 입자 크기, 농도 및 화학적 특성
이의주(Eui Ju Lee),George. W. Mulholland 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The characteristics of soot near the soot inception point for an ethene-air flame was carried out in a WSR (well-stirred reactor). The new sampling tool like the temperature controlled filter system was introduced to minimize the condensation during sampling. The new analysis tools applied include the real time size distribution analysis with the Nano-DMA, particle size by transmission electron microscopy, C/H analysis, g filter analysis, and thermogravimetric analysis using both non-oxidative and oxidative pyrolysis. The WSR can generate young soot particles that can be collected and examined to gain insight into inception. For the current conditions, soot does not form for Φ=1.9, inception occurs at or before Φ=2.0, and inception combined with soot surface growth and/or coagulation occurs for Φ=2.1. The filter samples for Φ=1.9 are composed of volatile compounds that evolve at relatively low temperatures when heated in the presence or absence of O₂. The samples collected from the WSR at Φ=2.0 and Φ=2.1 are precursor-like in morphology and size. They have higher C/H ratios and lower organic percentages than precursor particles, but they are clearly not fully carbonized soot. The WSR PAH distribution is similar to that in young soot from inverse flames.
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