Thermal conductivities of ten gases and selected binary and ternary mixtures of them were measured in a concentric silver cylinder cell over the temperature range from 100' to 540°C.The gases were helium, argon, nitrogen, oxygen, carbon dioxide, methyl ether, and methyl formate.Correlations based upon empirical equations derived from kinetic theory have been developed for the thermal conductivity of gas mixtures. For mixtures of polyatomic molecules the energy transport is considered in two parts, that is one portion transferred by collision and the other by diffusion. When compared with the experimental data for 226 binary mixtures over temperatures from 0" to 774'C.. the conductivity equation proposed in this work shows an average deviation of 2.1 %. Page 221 Vol. 8, No. 2 2.1 % . Comparisons of predicted val-* Tabular material bas been deposited as document 7080 with the American Documentation Institute, Photoduplication Service, Library of Congress, Washington 25, D. C., and may be obtained for $2.50 for photoprints or $1.75 for 35-mm. microfilm.

Test firings of solid propellant research rockets were made to study effects of propellant composition, pressure, and engine size on the exhaust oxide particle size, and on the composition of the solid exhaust products. The experimental results of this work and those reported by others were analyzed collectively to provide a reasonable description of the aluminum combustion and oxide condensation processes in solid propellant rocket motors. Combustion of aluminum was found to occur in the vapor phase, and was essentially complete in the engines studied although some combustion took place in the nozzle. The experimental results indicate that condensation of the oxide vapor can be described by first-order chemical kinetics. Further particle growth by agglomeration appears likely. The effect of two phase flow was found to be significant in the motors tested and reached a maximum in motors of a certain size. In motors where this loss is large, significant improvement in delivered performance can be realized by reducing the aluminum content.

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Introduction Background and Objectives Technical Approach General Physical Scenario MISER Model Analytical Results Basecase Repository-Uneventful Layered Salt Alternative Waste Forms 18 Release Rates and Uncertainties Technical Conclusions 35 References 37 Hi ABBREVIATIONS AEI Accessible environment individual ALI Annual limit of intake BE Best estimate CRI Columbia River individual CRP4 Columbia River population integrated for 10 4 y CRP5 Same as CRP4 except integrated for 10' y CRP6 Same as CRP4 except integrated for 10