はっ水性微細構造を有する平板間流れの数値解析(流体工学,流体機械)

概要

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We have investigated the drag reduction phenomena on highly water repellent surfaces, which have micron to sub-millimeter order of projections. In the present study, the flow field is modeled as laminar flow between two walls and is solved only near-wall region with finite difference method. To derive the entire velocity profile and to evaluate drag reduction ratio, velocity of the center region is estimated as quadratic function of distance from wall with appropriate boundary condition. The numerical results show that 50μm-width, 100μm-pitch, 25μm-height square projections on the parallel plates at 2mm distance gives 6.2% of drag reduction. Larger scale of microstructure or thinner micro-projections more drag reduction. On the other hand, air layer thickness or height of projections does not have significant influence on the degree of drag reduction.
社団法人日本機械学会の論文
2006-08-25