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The receding contact line cools down during dynamic wetting
Hiroki Kusudo1, Takeshi Omori2, Laurent Joly3
1Institute of Fluid Science, Tohoku University, 2-1-1 Katahira Aoba-ku, Sendai 980-8577, Japan.
The Journal of Chemical Physics
|October 25, 2023
Summary
Temperature can drop at a receding contact line (CL), unlike advancing CLs where it rises. This unexpected cooling is due to internal energy changes, offering new insights for dynamic CL modeling and nanofluidics.
Area of Science:
- Fluid dynamics
- Thermodynamics
- Nanotechnology
Background:
- Dynamic contact lines (CLs) exhibit different behaviors during advancing and receding motion.
- Advancing CLs typically show temperature increases due to viscous dissipation.
Purpose of the Study:
- To investigate the thermal behavior of receding contact lines.
- To understand the underlying mechanisms causing temperature changes at dynamic CLs.
Main Methods:
- Non-equilibrium molecular dynamics simulations were employed.
- Macroscopic energy balance analysis was performed around the dynamic CL.
Main Results:
- A significant temperature drop was observed at the receding CL.
- This cooling effect is attributed to changes in internal fluid energy caused by the potential field near the solid-liquid interface.
- The phenomenon resembles latent heat release during phase transitions.
Conclusions:
- Receding CLs can exhibit cooling, a novel finding distinct from viscous heating at advancing CLs.
- The study provides a framework for heat transport analysis in nanofluidic systems.
- New insights are offered for the accurate modeling of dynamic contact lines.
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