The in-situ measurements of ultra-fine oxide particles formed in a flame.

Ueyama, Korekazu; Tanaka, Keizo; Kawazoe, Hideyo; Iino, Akira; Matsuda, Yoshikazu; Furusaki, Shintaro

doi:10.4164/sptj.26.151

Cited by 2 publications

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“…Kn is the ratio of the mean free pass, I, of a gas molecule to the radius, dr/2, of a particle moving by thermophoresis. The value of I can be obtained by the following formula"1 1=0.709u lnM(R.Tc W' (4) where u=kinematic viscosity of gas, M = molecular weight of gas, R gas constant, and T<; =gas temperature, Since most of H, and 0, react with each other to H,O, the gas in the vicinity of the adhering surface is composed of equal volume of Ar, and H,O. The molecular weight of the gas is, therefore, assumed to be 30 taking an average of the molecular weight of argon, 40, and that of H 2 0, 18.…”

Section: Discussionmentioning

confidence: 99%

Thermophoresis Velocity of SiO2 Ultrafine Particles in a Flame [Translated]†

Ueyama¹,

Miyagawa

Furusaki

et al. 1991

KONA

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Thermophoresis of ultra•-fine SiO:-particles formed in a flame was experimental~\' investigated by setting an adhering surface perpendicular to a flame axis. The fo!!owing results v•.:ere obtained. I) Near the adhering surface, the number density of particles is considered to increase up to almost twice that in a flame. This is because the approaching velocity of particles decreased to about half of its original value keeping the cross sectional area of the flolt"ing region constant. 2) The therrnophoresis velocity was I. 0~ I. 4cmj s. 3) A particle diameter corresonding to the thermophoresis velocity is 0. 4-0. 8,u m, which is larger than a particle diameter measured in a flame. that is, 50~ 60nm. 4) Particles are considered to adhere to each other in the vicinity of the swface. 5) A main mechanism of particle adhesion is thermophoresis, and the effect of inertia can be neglected.

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Section: Discussionmentioning

confidence: 99%