せん断混合層流の混合反応に及ぼす格子の設置位置の影響(流体工学,流体機械)

概要

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The effects of a turbulence-generating grid on fluid mixing and chemical reaction in a liquid sheared mixing layer were experimentally investigated. The grid was installed at various positions in a mixing layer. Instantaneous velocity and concentration were simultaneously measured using a laser-Doppler velocimeter and a laser-induced fluorescence method. The results show that the grid generates turbulence at small scales and enhances fluid mixing and chemical reaction, but it decreases the velocity gradient in a mixing layer and the decrease of the velocity gradient results in the decrease of turbulence intensity and vertical mass transfer. Whereas the former influence appears only in the near region of the grid, the latter influence remains in the downstream region of the grid. Consequently, fluid mixing and chemical reaction are more promoted in the case which the grid is installed in the developed mixing layer than those in the cases which the grid is installed in the transitioning mixing layer.
社団法人日本機械学会の論文
2008-04-25