マランゴニ凝縮における伝熱面温度勾配下の表面張力差液滴移動 : 初生液滴間隔の影響(熱工学,内燃機関,動力など)

概要

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Condensate drop moves spontaneously in Marangoni dropwise condensation due to the surface tension distribution along the condensate surface which is determined by a bulk temperature gradient on the condensing surface. The objective of this study is to investigate experimentally the mechanisms which decide the velocity of drop movement. The velocity of drop movement is considered to be affected by surface tension gradient, concentration of vapor mixture and the shape of condensate drop. In this study, the initial drop distance of condensate drops, which was considered to be related to the shape of condensate droplets, was measured in Marangoni dropwise condensation of water-ethanol binary vapor mixture, and its effect on condensate drops movement was investigated. It is shown that the velocities of drop movement are not only affected by the vapor concentration and surface tension gradient, but also have a strong relationship with the initial drop distance of condensate drops. The velocity of drop movement has maximum value against the initial drop distance.
2009-09-25