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-1 気体分子運動論による理想気体の粘性係数の導 …

3-1 . Maxwell- . v . Boltzmann .. 8k B T 1/ 2. v = .. m . x . u =. 1. x . 2 nd 2. y . y y .. y y + y .. y .. , , . y .. y y . y'+ .. y' .. A .. y' .. u+ uy' u u .. x .. v tA. nv tAmu .. 1. t nv tA. nv tAmu . 6. A t = nv tA. yx {( muy' mu+ ) + ( mu muy' )}. 6. yx y x . du du . u+ u Taylor u+ = uy' + u = uy' . dy y' dy y'. yx mnv mnv )+ # du & -+. yx = {(uy' u+ ) + (u uy' )} = * 2 % ( . 6 6 +, $ dy 'y' +/. " du % . yx = $ '. # dy &. mnv . = Maxwell-Boltzmann v . 3. 1/ 2. 2 mkB T . = . 3 d 2 . m . MT. Maxwell-Boltzmann . 1/2 1/2 .. 3-2 . , , .. y . y y y'+ .. y' . v t .. y' A. C . C+ Cy' C . v ! dC $. C+ = Cy' + # & t vA t C . C+ C . " dy %y' CvA t . Taylor . " dC %. C = Cy' $ ' . # dy &y' 1/6 . vA t {(Cy' C+ ) + (C Cy' )}.. 6. NA t N . vA t NA t =. 6. {(Cy' C+ ) + (C Cy' )}. " dC % " dC % " dC %. Taylor { } (C C+ ) + (C Cy' ) = C C+ = Cy' $ ' Cy' $ ' = 2 $ '.

以上のことから,着目面を通過する物質量は と導出できる。 € 理想気体の拡散係数は温度tの3/2乗,分子量mの -1/2乗,圧力の -1乗 に比例する

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