4.8 Article

Oscillations of Drops with Mobile Contact Lines on the International Space Station: Elucidation of Terrestrial Inertial Droplet Spreading

期刊

PHYSICAL REVIEW LETTERS
卷 129, 期 8, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.084501

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资金

  1. NSF [1530522, 1637960, 1935590]
  2. NASA [80NSSC19K0406]
  3. Directorate For Engineering
  4. Div Of Civil, Mechanical, & Manufact Inn [1935590] Funding Source: National Science Foundation
  5. Div Of Chem, Bioeng, Env, & Transp Sys
  6. Directorate For Engineering [1530522, 1637960] Funding Source: National Science Foundation

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In this study, shape oscillations of sessile water drops with fully mobile contact lines aboard the International Space Station were analyzed. Experimental observations, which agree with spectral predictions, helped elucidate the phenomenon of terrestrial droplet inertial spreading.
We analyze shape oscillations of sessile water drops with fully mobile contact lines (CL) aboard the International Space Station. The unique microgravity environment enables the study of centimeter-sized droplets with associated inertial-capillary motions. Plane-normal substrate vibrations induce resonance behaviors quantified by frequency scans from which the natural frequencies and mode shapes are identified for nine different hydrophobic surfaces. Experimental observations agree well with, and validate, a recent spectral prediction of mobile CL sessile drop oscillations. The experimental findings help elucidate terrestrial droplet inertial spreading, a poorly understood phenomenon pervasive in many processes.

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