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イベント名 第6回 物理学教室談話会
Droplet motion on a substrate
イベント種類 セミナー
対象 教職員向け 大学院生向け
イベント概要 講師:土井 正男(北京航空航天大学)
概要:Droplets placed on a substrate show various complex and
intriguing motions under the action of gravity, surface tension, and
wetting energy of the substrate etc. For example an oil droplet
spreads on a dish when it is placed on the dish, starts to move if the
dish is tilted, breaks up into smaller droplets, or merges together to
form a bigger droplet. Theoretical analysis for such phenomena is
difficult since it involves the problem of moving boundary and the
singularity at the contact line. Here I will show a simple method to
analyze the phenomena. It is based on Onsager principle [1]. It is an
approximate method, but avoids the difficulty in the conventional
hydrodynamic approach. The simplicity of the method allows us to treat
fairly complex problems such as

a) spreading of evaporating droplet on a substrate, and deposition
patterns left on the substrate[2].
b) sliding down of droplet on an inclined substrate[3]
c) motion induced by evaporating droplet[4]


[1] Masao Doi, Soft Matter Physics, Oxford University Press, p1-257 (2013).
[2] Xingkun Man and Masao Doi, Phys. Rev. Lett. 116, 066101 (2016).
"Ring to Mountain Transition in Deposition Pattern of Drying Droplets"
[3] Xianmin Xu and Yana Di, Masao Doi, Phys. Fluids, 28 087101 (2016).
"Variational method for contact line problems in sliding liquids"
[4] Xingkun Man, and Masao Doi Phys. Rev. Lett., 119, 044502 1-5 (2017).
"Vapour-Induced Motion of Liquid Droplets on an Inert Substrate"
開催期間 2017年11月30日 16:00〜18:00
会場 ウエスト1号館B棟2階211号室(W1-B-211)
定員 なし
参加費 無料
申込み方法 事前申込み不要
物理学部門 中西 秀