高温および低温気流による放射状自由液膜流の穿孔促進(流体工学,流体機械)

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A mechanism promoting perforations in a radial liquid sheet through a hot/cold air flow is investigated. The radial liquid sheet is produced by release of a liquid film spreading on a disk into the air. In the radial liquid sheet, a laminar-turbulent transition occurs just outside the disk edge. The liquid sheet is perforated after the transition and atomized by the perforations increasing with Reynolds number. The perforation is promoted by the impingement of a hot/cold air flow on the transition point. The promotion by the cold air flow suggests that the promotion is not due to evaporation of the liquid sheet. Observations of the liquid sheet in various flow conditions demonstrate critical flow conditions required for the promotion of the perforation by the hot air flow. The observations also show that thin liquid membrane, which is formed after the transition at high Reynolds numbers, is necessary for the promotion of the perforation. A perforation mechanism is proposed for the promotion of the perforation by the hot/cold air flow based on a Marangoni stress affecting on the liquid membrane, which is heated/cooled easily because of its ultimate thinness. The beginning point of the perforation in the liquid membrane and the thickness of the liquid membrane are determined by CCD images of the liquid membrane. The difference in the beginning point of the perforation by air flow temperatures and measured thickness (≒5μm) of the liquid membrane support the validity of the proposed perforation mechanism.
社団法人日本機械学会の論文
2009-02-25

高温および低温気流による放射状自由液膜流の穿孔促進(流体工学,流体機械)

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