Formation, Evolution, and Extinction of Standing Waves in Evaporation from Pores.
We report on the formation, evolution, and extinction of standing waves (SWs) detected by infrared 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). Dependent upon the tube size and the initial liquid filling ratio, the SWs start sooner for a 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 upon 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.
School of Engineering, The University of Edinburgh , Mayfield Road, Edinburgh EH9 3JL, United Kingdom.
Cosimo
C
Buffone
School of Engineering, The University of Edinburgh , Mayfield Road, Edinburgh EH9 3JL, United Kingdom.|Tianjin Key Laboratory of Refrigeration Technology, Tianjin University of Commerce , Tianjin 300134, People's Republic of China.
Khellil
K
Sefiane