上端を閉じた細管内液体の自然落下(熱工学,内燃機関,動力など)

概要

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The liquid in a capillary pipe with a closed upper end falls spontaneously when the pipe is inclined by a certain critical angle from the vertical direction. A theoretical investigation was conducted to analyze the unstable phenomenon from a thermodynamic viewpoint. The system energy is calculated by considering the potential energy and the surface energy of the three-dimentional liquid meniscus formed under the pipe end, and the energy change due to wetting between liquid and solid surface. The system becomes unstable if the energy change is negative when the attaching point of meniscus is displaced by infinitesimal distance. The critical angle of pipe inclination is obtained by the above condition based on an approximate solution for the three-dimensional meniscus profile. The results agree with those obtained by experiment using glass and Teflon pipes for various test liquids.
一般社団法人日本機械学会の論文
2004-04-25