Abstract
Fluid velocity measurement in liquid films is a challenging task due to the small film thickness and large transverse gradients of velocity. While this problem was solved for the case of two-dimensional waves by several research groups, measurements in three-dimensional waves impose additional difficulties that we managed to overcome in the course of this study. We used a single light field camera for simultaneous particle tracking velocimetry and laser-induced fluorescence film thickness measurements. In this way, obtained velocity fields were related to the wavy interface shape. The applicability of the proposed methodology was demonstrated in the test experiments, which were carried out for two-dimensional regular waves. Measurements in three-dimensional waves were performed for the fluids with different viscosities and surface tensions but with close values of the Kapitsa number. In all investigated cases, the flow structure in different parts of waves is similar. Comparison of the experimentally obtained velocity fields with calculations by weighted residual integral boundary layer model shows qualitative agreement.
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