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On axisymmetric dynamic spin coating with a single drop of ethanol

Published online by Cambridge University Press:  08 November 2022

Yuming Pan ,
Zhibei Wang ,
Xinyan Zhao ,
Weiwei Deng Open the ORCID record for Weiwei Deng [Opens in a new window]  and
Huihui Xia Open the ORCID record for Huihui Xia [Opens in a new window]
Yuming Pan
Affiliation:
Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Zhibei Wang
Affiliation:
Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Xinyan Zhao
Affiliation:
Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Weiwei Deng*
Affiliation:
Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Huihui Xia*
Affiliation:
Shenzhen Key Laboratory of Soft Mechanics & Smart Manufacturing, Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
*
†Email addresses for correspondence: dengww@sustech.edu.cn, xiahh@sustech.edu.cn
†Email addresses for correspondence: dengww@sustech.edu.cn, xiahh@sustech.edu.cn
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Abstract

We carried out experimental and numerical investigations on the axisymmetric spreading evolution of dynamic spin coating with a single drop of ethanol. The results show that the dynamic spreading process consists of two stages: inertial spreading stage and centrifugal thinning stage. These two stages are connected by a transient state in between characterized by the minimum contact line moving velocity. The Weber number determines the spreading in the first stage, similar to the case of the impact of a drop on a static substrate. The rotational Bond number has a marginal effect on the inertia spreading and the radius at the transient state. In the centrifugal thinning stage, the rotational Bond number dominates the flow while the effect of the Weber number is negligible.

JFM classification

Drops and Bubbles: Drops Geophysical and Geological Flows: Rotating flows Materials Processing Flows: Coating
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 951 , 25 November 2022 , A30
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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