The characteristics of Marangoni eruptions of immobilised single drops

被引:0
|
作者
Ruiken, Jan-Paul [1 ]
Villwock, Joern [1 ]
Kraume, Matthias [1 ]
机构
[1] Tech Univ Berlin, Chair Chem & Proc Engn, Ackerstr 76, D-13355 Berlin, Germany
关键词
Marangoni effect; Periodicity; Ternary mass transfer; Immobilised drops; Acoustic levitation; Liquid-liquid extraction; MASS-TRANSFER; FLUID-DYNAMICS; CONVECTION; INSTABILITIES; DROPLETS; IMPACT;
D O I
10.1016/j.ijheatmasstransfer.2024.126515
中图分类号
O414.1 [热力学];
学科分类号
摘要
The concentration-induced Marangoni effect on single drops is investigated experimentally. The standard chemical system toluene/water/acetone, known for its strong Marangoni instabilities, was chosen for this study. The toluene drops with acetone as solute are immobilised in water by acoustic levitation. The mass transfer from the dispersed to the stagnant continuous phase is observed optically: qualitatively by rainbow schlieren deflectometry and quantitatively by monochrome imaging. The contactless immobilisation allows precise transient mass transfer measurements of weak Marangoni eruptions, which would be suppressed by standard research approaches with sessile drops. Although the influence of standing waves can slightly alter the experimental results, these measurements provide a unique experimental insight. Observations of Marangoni eruptions of & Oslash; 3/5 mm drops occurring at acetone concentrations up to 35.8/60.6 g/L have shown an average periodicity of 11.5/14.4 s, an average duration of 3.7/4.4 s, and a maximum mass transfer enhancement by a single eruption of 5.0/10.6 g/L. Solute loss during the injection process prior to optical volume acquisition ranged from 22.7 to 67.5%. The results are of significant value invalidating numerical investigations of the partially unquantified Marangoni effect.
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页数:8
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