スギモト タケシ   Sugimoto Takeshi
  杉本 剛
   所属   神奈川大学  工学部 情報システム創成学科
    神奈川大学大学院  工学研究科 工学専攻(情報システム創成領域)
   職種   教授
言語種別 日本語
発行・発表の年月 2009/09
形態種別 その他
標題 水より重い濡れた球の水面への張りつきについて
執筆形態 単著
掲載誌名 日本流体力学会年会2009講演要旨集
巻・号・頁 362頁
概要 A wet and heavier-than-water sphere is a model to account for behaviours of planarians, fresh water creature. They are wet and heavier than water. They move by ciliary gliding on substrata as well as the water surface. The latter feat is analysed by a sphere model. There exists a stable equilibrium among the surface tension, the buoyancy and the weight under the subtle combination between the sphere density and the wet angle. Using the equilibrium the possible sphere density is estimated: if the radius is 10mm, the surface tension and buoyancy suspend the spheres slightly heavier than water; if the radius is 1mm, the forces can suspend the spheres 2.6 to 6.7 times heavier than water. Widths of planarians are of the order of 1mm, and hence the same mechanism applies to planarians' feat on the water surface.