The viscosity of mixtures of gases at high temperatures

An accurate knowledge of the high temperature viscosity of mixtures of gases, such as the products of fuel combustion, is desirable for heat transfer calculations. The viscosities of mixtures of carbon dioxide and nitrogen were determined up to 900° C by a method in which the rate of fall of gas pressure in a closed, heated container is observed over a short period during which the gas is flowing out to the atmosphere along a heated capillary tube. A comparison is made between the experimental values obtained and those calculated for similar gas mixtures on the basis of a modern theory of transport coefficients. This comparison shows that it is possible to calculate the viscosities of gas mixtures at high temperatures with an accuracy of at least 2%.

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