Study on molecular diffusion behavior in stratified stable density layer of two component gases with natural convection

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This study is to investigate an effect of natural convection on mixing processes by molecular diffusion in a vertical stable stratified fluid layer consisting of two component gases. The experiment has been performed regarding the combined phenomena of molecular diffusion and natural convection in two vertical slots which consists of the heated slot and the other side cooled slot. The density change of the gas mixture in the top of slot was obtained and the mixing process when the heavier gas ingress into the vertical slot filled with the lighter gas from the bottom side of the slot was discussed. It was found that natural convection affects an amount of transported gas more than molecular diffusion, even if a temperature difference is so small. The onset time of natural circulation becomes short by the localized natural convection ; therefore the mixing process of two component gases becomes more complex phenomena by molecular diffusion, natural convection and natural circulation.