Taylor法による気体の相互拡散係数の測定 : (第5報, CO_2-空気系, CO_2-N_2系, CO_2-O_2系, CH_4-空気系, CH_4-N_2系, CH_4-O_2系, N_2O-空気系, N_2O-N_2系およびN_2O-O_2系の測定)

概要

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The mutual diffusion coefficients of three global warming gases (CO_2,CH_4 and N_2O) into air and its component gases (N_2 and O_2) have been measured in the temperature range 0〜180℃ and at atmospheric pressure by the use of the Taylor dispersion method. The mutual diffusion coefficients do not vary in practice on substituting pure N_2 or O_2 for air. The mutual diffusion cofficients for CO_2 and N_2O, which have almost the same molecular weight, agree with each other within the experimental uncertainty (±2%) and are smaller than that for CH_4. The present results can be reproduced well by the functional form D=AT^B, where D is the mutual diffusion coefficient at 1 atm (101 325 Pa) in m^2/s and T is the absolute temperature in K. The constants A and B are as follows : CO_2-(air, N_2,O_2), A=5.75×10^<-10>, B=1.81 ; CH_4-(air, N_2,O_2), A=7.04×10^<-10>, B=1.83 ; N_2O-(air, N_2,O_2), A=5.34×10^<-10>, B=1.82.
一般社団法人日本機械学会の論文
1998-05-25