日本機械学会論文集B編
Online ISSN : 1884-8346
一般論文
気泡プルームによる密度成層崩壊プロセスの時空間構造
北浦 秀和村井 祐一田坂 裕司熊谷 一郎城野 清治
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79 巻 (2013) 801 号 p. 966-979

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Fluid dynamic process of density destratification enabled by a bubble plume is investigated. General parametric dependence to global mixing is studied with numerical simulation coded by number density model of bubbly flow and then multiple experiments using dye visualization and ultrasonic velocity profiling (UVP) are carried out to find out the spatiotemporal structure of the two-phase flow emerging during destratification. The results show that intermittent convection driven in the near field of the bubble plume plays the primary role of the destratification. The intermittency is triggered by interaction between the near-field turbulence and the far-field wavy motion of bubble plume, which is clearly shown by the recurrence map and the power spectra of the velocity fluctuation measured by UVP.

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