TY - JOUR
T1 - Spreading and oscillation dynamics of drop impacting liquid film
AU - Tang, Xiaoyu
AU - Saha, Abhishek
AU - Sun, Chao
AU - Law, Chung K.
N1 - Funding Information:
The work performed at Princeton University was supported by the Army Research Office (grant no. W911NF1610449) under the technical monitoring of Dr R. A. Anthenien.
Publisher Copyright:
© The Author(s) 2019.
PY - 2019/12/25
Y1 - 2019/12/25
N2 - We herein report an experimental study to explore the effects of impact inertia, film thickness and viscosity on the dynamics of shape deformation of a drop impacting a liquid film. We have identified that the spreading dynamics shows a weak dependence on impact inertia, but strongly depends on the film thickness. For a thick film, the liquid surface deforms and absorbs part of the impact energy, and hence inhibits spreading of the drop. For a thin film, the drop motion is restricted by the bottom solid substrate, promoting spreading. The periodicity of the capillary controlled shape oscillation, on the other hand, is found to be independent of impact inertia and film thickness. The damping of the shape oscillation shows strong dependence on the film thickness, in that the oscillation decays faster for smaller film thicknesses, due to the enhanced viscous loss.
AB - We herein report an experimental study to explore the effects of impact inertia, film thickness and viscosity on the dynamics of shape deformation of a drop impacting a liquid film. We have identified that the spreading dynamics shows a weak dependence on impact inertia, but strongly depends on the film thickness. For a thick film, the liquid surface deforms and absorbs part of the impact energy, and hence inhibits spreading of the drop. For a thin film, the drop motion is restricted by the bottom solid substrate, promoting spreading. The periodicity of the capillary controlled shape oscillation, on the other hand, is found to be independent of impact inertia and film thickness. The damping of the shape oscillation shows strong dependence on the film thickness, in that the oscillation decays faster for smaller film thicknesses, due to the enhanced viscous loss.
KW - drops and bubbles
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U2 - 10.1017/jfm.2019.771
DO - 10.1017/jfm.2019.771
M3 - Article
AN - SCOPUS:85074348462
SN - 0022-1120
VL - 881
SP - 859
EP - 871
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -