Molecular Dynamics Study of Bubble Nucleation on an Ideally Smooth Substrate

Area of Science:

• Thermodynamics
• Materials Science
• Computational Physics

Background:

• Bubble nucleation on smooth surfaces is poorly understood due to scale limitations.
• Traditional numerical simulations often require additional disturbances for nucleation studies.

Purpose of the Study:

• To investigate bubble nucleation on an ideally smooth substrate using molecular dynamics simulations.
• To explore the influence of thermal energy transfer on nucleation at the atomic level.
• To compare bubble nucleation on smooth versus nanostructure substrates.

Main Methods:

• Molecular dynamics simulations were employed.
• An ideally smooth hydrophilic platinum substrate at 145 K was used to heat liquid argon.
• Nanostructure substrates were introduced for comparative analysis.

Main Results:

• A visible bubble nucleus formed spontaneously on the smooth substrate without external disturbance.
• Nucleation position was unpredictable due to inhomogeneous thermal energy transfer at the atomic level.
• Nanostructure substrates showed no significant difference in nucleation inception temperature but improved nucleation rates.

Conclusions:

• Inhomogeneous thermal energy transfer is a key factor in spontaneous bubble nucleation on smooth surfaces.
• Nanostructure substrates enhance bubble nucleation rates compared to ideally smooth surfaces.