垂直流下液膜流の2次元界面波構造に関する数値解析(流体工学,流体機械)

概要

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Two dimensional direct numerical simulations have been performed in order to investigate the surface waves of falling films for three kinds of working fluids by using MARS (Multi-interfaces Advection and Reconstruction Solver) method. The surface waves can be controlled by an external artificial velocity oscillation. Although the amplitude of the artificial velocity oscillation is very small, the disturbances create small surface waves and eventually they develop to large surface waves consisting of solitary waves and capillary waves due to instability of falling films. The numerical results indicate that the surface wave patterns of these two dimensional waves can be divided into three groups with the dimensionless frequency, the ratio of the Weber number to the Kapitza number. It is found that these surface wave groups don't depend on the Reynolds number. According to the present results, the new correlations for the wave peak height with the Kapitza number and the dimensionless frequency and for the wavelength with dimensionless frequency are proposed. These correlations for three kinds of working fluids used in this study are shown in good agreement with the numerical and experimental results in a range of Re=30-400.
社団法人日本機械学会の論文
2006-07-25