容器内の層流および乱流の流れ場における粒子状・ガス状物質の輸送現象の実験と計算による検討

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タイトル別名
  • Experiment and Calculation of the Transport of Particulate and Gaseous Matters in Laminar and Turbulent Flows in a Chamber
  • ヨウキナイ ノ ソウリュウ オヨビ ランリュウ ノ ナガレバ ニ オケル リュ

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The transport of particulate and gaseous matters in chamber flow ranging from laminar to turbulent flows was studied. Tracer particles and gas, monodisperse latex aerosol particles of 0.3 μm in diameter and oxygen gas, were passed through a 12 l cylindrical chamber to measure the temporal change in their concentration at the outlet port of the chamber. The temporal change was also investigated by numerically solving the governing equations for gas flow and the convective-diffusive transport of the particles and oxygen gas in the flow. When the flow in the chamber was considered to be laminar flow and sufficiently developed turbulent flow, the measured concentration changes were predicted quantitatively by employing the equations for laminar flow and those including one of the two versions of the k-ε turbulence model employed here, respectively. However, in the case that the flow was considered to be transitional flow, the results calculated using the high-Reynolds number version of the turbulence model (the standard k-ε model) overestimated the turbulent diffusive transport in the chamber. The other model, the RNG k-ε turbulence model, gave fairly a reasonable prediction for the transitional flow cases.

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