Measurements of the Mutual Diffusion Coefficients of Gases by the Taylor Method : (5th Report, Measurements on the CO2-air, CO2-N2, CO2-O2, CH4-air, CH4-N2, CH4-O2, N2O-air, N2O-N2 and N2O-O2 Systems)

• Published in: Transactions of the Japan Society of Mechanical Engineers Series B Vol. 64; no. 621; pp. 1433 - 1439
• Main Authors: MATSUNAGA, Naoki, HORI, Morio, NAGASHIMA, Akira
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 25.05.1998
• Subjects: O2
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.64.1433

The mutual diffusion coefficients of three global warming gases (CO2, CH4 and N2O) into air and its component gases (N2 and O2) have been measured in the temperature range 0∼180°C and at atmospheric pressure by the use of the Taylor dispersion method. The mutual diffusion coefficients do not vary in practice on substituting pure N2 or O2 for air. The mutual diffusion cofficients for CO2 and N2O, which have almost the same molecular weight, agree with each other within the experimental uncertainty (±2%) and are smaller than that for CH4. The present results can be reproduced well by the functional form D=ATB, where D is the mutual diffusion coefficient at 1 atm (101 325 Pa) in m2/s and T is the absolute temperature in K. The constants A and B are as follows : CO2-(air, N2, O2), A=5.75×10-10, B=1.81 ; CH4-(air, N2, O2), A=7.04×10-10, B=1.83 ; N2O-(air, N2, O2), A=5.34×10-10, B=1.82.