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Buoyancy-driven Convective Motion in a Thermal Diffusion Cloud Chamber Using a Water/helium Mixture by Françoise Utheza; Dorothée Sénechal; François Garnier is a Engineering article available to read on EtoBox.

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This work is focused on a 2D numerical simulation of a thermal diffusion cloud chamber (TDCC) operating with water-helium mixture. We particularly address the impact of the stability of the vaporgas mixture with respect to buoyancy-driven convective motion on homogeneous water nucleation rates. A comparison of our model results with Heist and Reiss results of nucleation of water in helium is first proposed. So, no convective fluxes are assumed within the TDCC and the critical supersaturation of water vapor is in agreement as obtained from numerical predictions. However, the influence of wall heating on the critical supersaturation results is found to be significant as obtained when convective transfers is accounted for within the TDCC and the results deviate significantly from those provided by Heist and Reiss. Their approach may lead large differences in terms of temperature, saturation ratio and nucleation profiles as it oversimplifies heat and mass transfer in TDCC compared to a 2D mass, heat and momentum model.

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Author

Françoise Utheza; Dorothée Sénechal; François Garnier

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1290-0729)

Published

2009

Language

EN

Field

Engineering (Physical Sciences)