Capillary spreading of contact line over a sinking sphere

Kim, Seong Jin; Fezzaa, Kamel; An, Jim; Sun, Tao; Jung, Sunghwan

doi:10.1063/1.4991361

Title: Capillary spreading of contact line over a sinking sphere

Journal Article · Mon Sep 25 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4991361· OSTI ID:1491706

^[1]; Fezzaa, Kamel ^[2]; An, Jim ^[1]; Sun, Tao ^[2]; Jung, Sunghwan ^[1]

Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

The contact line dynamics over a sinking solid sphere are investigated in comparison with classical spreading theories. Experimentally, high-speed imaging systems with optical light or x-ray illumination are employed to accurately measure the spreading motion and dynamic contact angle of the contact line. Millimetric spheres are controlled to descend with a constant speed ranging from 3.2 x 10⁴ to 0.79 m/s. We observed three different spreading stages over a sinking sphere, which depends on the contact line velocity and contact angle. These stages consistently showed the characteristics of capillarity-driven spreading as the contact line spreads faster with a higher contact angle. The contact line velocity is observed to follow a classical capillary-viscous model at a higher Ohnesorge number (> 0.02). For the cases with a relatively low Ohnesorge number (< 0.02), the contact line velocity is significantly lower than the speed predicted by the capillary-viscous balance. This indicates the existence of an additional opposing force (inertia), which is a similar transition from capillary viscous to capillary-inertia balances found in drop-impact dynamics. Additionally, we observed the linear relation between the contact line velocity and the sphere sinking speed during the second stage, in which the contact line inertia is balanced with the impact pressure by a sphere at high inertia regimes.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1491706

Alternate ID(s):: OSTI ID: 1395379

Journal Information:: Applied Physics Letters, Vol. 111, Issue 13; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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