D313 Finger の成長速度が化学反応を伴う Viscous Fingering の反応特性に与える影響

概要

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Effects of finger-growth velocity on reaction characteristics of reactive miscible viscous fingering were investigated experimentally, using a Hele-Shaw cell. When the finger-growth velocity is low enough to neglect convective effect, the reaction pattern is primarily affected by the dimensionless parameter Φ_v determined by initial reactant concentrations. When Φ_v is sufficiently smaller than 1,the reaction zone is located far from the interface between two liquids in the less viscous liquid, and the product spreads over a relatively broad area inside fingers. On the other hand, when Φ_v is sufficiently larger than 1,the reaction zone is located close to the interface in the more viscous liquid, and then the product concentrates around the fingertips. As the finger-growth velocity is higher, the reaction zone is located close to the interface and the product remarkably exists around the fingertips regardless of Φ_v. These indicates that the convective effect primarily affects the reaction pattern instead of Φ_v. The three-dimensional structure around the fingertips is affected by the convection as well, which forwards the variation in the reaction pattern mentioned above.
日本流体力学会の論文
2001-07-31