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Capillary wave method: An alternative approach to wave excitation and to wave profile reconstruction

Authors :
Andrey Shmyrov
Anastasia Shmyrova
Aleksey Mizev
Irina Mizeva
Source :
Physics of Fluids. 31:012101
Publication Year :
2019
Publisher :
AIP Publishing, 2019.

Abstract

The capillary wave method is a well-known classical technique to measure surface tension and surface rheological properties. Despite the large number of theoretical works devoted to capillary waves, this technique has serious difficulties associated with its implementation, and therefore, it is not widely used by researchers. In this paper, we introduce our modifications of the existing method to overcome its drawbacks. First, a capillary wave is excited by pressure fluctuations generated locally at the interface. Being contactless, the proposed method is suitable for any liquid irrespective of its electrical properties. Second, the application of optical interferometry together with the spatial phase shifting method allows to quantify the surface profile with high accuracy. A new data processing algorithm makes it possible to subtract the parasitic deformation of the surface caused by external perturbations avoiding, thereby the thorough vibroisolation procedure. The relative error for surface measurements and surface tension calculations is 0.3%. The results of surface tension measurements of several liquids obtained by the modified method are in good agreement with the data determined by the Wilhelmy plate technique. The main advantage of our method is that is well suited for measurements of low liquid volumes, which makes it of particular interest in biological and chemistry applications. Additionally, our version of the examined method allows one to extend the frequency range to 103–104 Hz, where only the quasi-elastic light scattering technique is currently applicable.

Details

ISSN :
10897666 and 10706631
Volume :
31
Database :
OpenAIRE
Journal :
Physics of Fluids
Accession number :
edsair.doi...........450cd426dbb6eea5a50bcf9d7b174a1a
Full Text :
https://doi.org/10.1063/1.5060666