鉛直ダクト内気泡流における乱れエネルギ収支(混相(1),一般講演)

概要

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A molecular tagging velocimetry based on photobleaching reaction was applied to turbulent bubbly flows with sub-millimeter bubbles in a vertical square duct to examine the applicability of the κ-ε models to the bubbly flows. The conclusions obtained are as follows: (1) The κ-ε models can reasonably evaluate the production rate of turbulence kinetic energy (TKE) in bubbly flows. (2) Bubbles agitate the liquid flow and enhance the diffusion rate of TKE. The enhancement of the diffusion due to bubbles has different characteristics from the diffusion enhancement due to shear-induced turbulence, and the κ-ε models cannot evaluate the enhancement of diffusion rate due to bubbles in the near wall region. (3) The κ-ε models give not so bad predictions for the production, diffusion and dissipation rates of dissipation rate of TKE.
日本流体力学会の論文
2010-09-09