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- W2082527633 abstract "The convective stability range of nonreactive binary gas mixtures (Xe:He,Xe:Ar) in a closed vertical cylinder with conducting walls heated from below was investigated. The xenon mole fraction was varied from XXe = 1 to 0.03 and from 1 to 0 for the helium and argon containing mixtures, respectively. Critical thermal Rayleigh numbers NRa1 for the onset of convective flow were obtained from high resolution differential temperature measurements. Thermal diffusion ratios were calculated, based on Lennard–Jones potentials, over the whole composition range for both gas mixtures. Minima in NRa1 occurred at the composition for which maximum relative mass separation of the components due to thermal diffusion is predicted. Specifically, the monocomponent value NRa1≊200 for a cylinder with height-to-radius ratio of 6 was reduced to 25 at XXe≊0.03, and 165 at XXe≊0.3 for the Xe:He and Xe:Ar systems, respectively. Comparison with Rayleigh–Bénard instability theory, including Soret and Dufour effects, shows that for (gas) mixtures, the lateral walls act convectively less stabilizing than for monocomponent systems. It is shown that Dufour contributions to convective stability in these gas mixtures are negligible." @default.
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- W2082527633 date "1981-03-01" @default.
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- W2082527633 title "Soret diffusion and convective stability in a closed vertical cylinder" @default.
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- W2082527633 doi "https://doi.org/10.1063/1.863381" @default.
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