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Formation, evolution and extinction of Standing Waves in evaporation from pores

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Original languageEnglish
Pages (from-to)12078–12083
JournalLangmuir
Volume32
Issue number46
Early online date3 Nov 2016
DOIs
Publication statusE-pub ahead of print - 3 Nov 2016

Abstract

We report on the formation, evolution and extinction of Standing Waves (SW) detected by Infra-Red (IR) measurements at the upper region of a curved meniscus interface pinned at the mouth of a horizontally positioned capillary pore. The SWs are clear and strong in acetone but absent in ethanol for both tube sizes investigated (1-2 mm diameter). Depending on the tube size and the initial liquid filling ratio, the SWs start sooner for lower filling ratio. The intriguing experimental observation is that the SWs disappear at a specified liquid length between the receding meniscus and the one pinned at the tube mouth, which seems to depend strongly on the tube size and independent of the initial liquid filling ratio. The origin of the SWs could be due to the strong interaction between surface tension and gravity which also generates oscillatory periodic Marangoni flow in the meniscus liquid phase.

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