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Spreading Time of Impacting Nanodroplets
Yi-Bo Wang1,2, Yi-Feng Wang1,2, Yan-Ru Yang1,2
1State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
The Journal of Physical Chemistry. B
|May 19, 2021
Summary
Nanodroplet impact on surfaces shows capillary and viscous regimes still exist at the nanoscale. A universal scaling law accurately predicts maximum spreading time across various liquids and surface wettabilities.
Area of Science:
- Fluid dynamics
- Nanotechnology
- Surface science
Background:
- Droplet impact dynamics are crucial in micro/nanoscale applications.
- Understanding nanoscale fluid behavior is challenging due to increased viscous dissipation.
- Surface wettability significantly influences droplet spreading.
Purpose of the Study:
- Investigate nanodroplet impact dynamics on surfaces with varying wettability.
- Determine scaling laws for maximum spreading time in capillary and viscous regimes.
- Develop a universal scaling law for nanodroplet spreading time.
Main Methods:
- Analysis of kinematic and maximum spreading times for nanodroplets.
- Derivation of scaling laws for capillary and viscous regimes.
- Molecular dynamics simulations for validation.
Main Results:
- Capillary regime persists in nanodroplet impact despite increased viscous dissipation.
- Identified distinct scaling laws for capillary and viscous spreading regimes.
- Proposed a universal scaling law that accurately models nanodroplet spreading.
Conclusions:
- Nanodroplet spreading dynamics are governed by both capillary and viscous effects.
- The universal scaling law provides a robust framework for predicting spreading time.
- Findings are validated by molecular dynamics simulations across diverse conditions.
