流体力学セミナー流体力学セミナー

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流体力学セミナー ２００９

＃場所と時間にご注意ください。
＃本セミナーは京大理物理教室で １０／１６ 金曜日昼に行います。

日時： 10月 16日（金） 13:00 から 14:30

場所： 京大 理学部５号館 ４１３号室

講師：Ranga Narayanan 氏
(Director of The Center for Surface Science and Technology,
University of Florida)
　　　
題目: Instabilities due to Phase Change

概要：Phase change causes instabilities and an example is
evaporative instability. This has much in common with solidification
instability, electrodeposition and even viscous fingering instability.
It is an instability that is driven by nutrient gradients which,
in this case, are temperature gradients. In the current study we have
investigated evaporative instability in a variety of configurations.
There are several ways to view how one might conduct an evaporation
experiment and in one of these the input variables are the depths of
fluid layers, the temperature difference across the system and
the pressure at the top plate. Once these are fixed, the outputs are
the bifurcation nature and the evaporation and heat transfer rates.
We present calculations which tell us that when the instability sets
in the branching can be either a forward or backward pitchfork but
the evaporation rates are always increased. In this regard the problem
is quite unlike solidification or electrodeposition. I shall also
present results that take into account experimental complications
such as side wall effects and buoyancy. We present detailed physical
reasoning behind our observations.

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世話人：山田 道夫(京大数理研)， 藤 定義(京大)，松本 剛(京大理)
アドバイザー：船越 満明（京大情報学）、水島 二郎(同志社大工)、
余田 成男（京大理）
連絡先：山田道夫 yamada＠kurims.kyoto-u.ac.jp
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