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Heterogeneous vapor bubble nucleation on a rough surface
Alexey O Maksimov1, Aleksey M Kaverin, Vladimir G Baidakov
1Pacific Oceanological Institute Far Eastern Branch of the Russian Academy of Sciences, Vladivostok, Russia.
Langmuir : the ACS Journal of Surfaces and Colloids
|February 20, 2013
Summary
Vapor bubble nucleation on microrough surfaces is analyzed. Concave surface sites reduce the energy barrier for bubble formation, impacting nucleation density on random surfaces.
Area of Science:
- Thermodynamics
- Fluid Mechanics
- Surface Science
Background:
- Vapor bubble nucleation is crucial for phase change heat transfer.
- Understanding nucleation on real surfaces requires considering surface topography.
- Microroughness significantly influences bubble formation dynamics.
Purpose of the Study:
- To analyze vapor bubble nucleation on microrough surfaces.
- To evaluate the work of formation for critical nuclei in surface cavities.
- To determine the effect of surface curvature on nucleation barriers.
Main Methods:
- Theoretical analysis of nucleation work in surface cavities.
- Modeling of microrough surfaces using Gaussian random functions.
- Evaluation of average nucleation site density.
Main Results:
- Concave surface sites (negative curvature) lower the activation energy barrier for critical nucleus formation.
- The average nucleation site density depends on the statistical properties of the surface roughness.
- Surface geometry plays a key role in controlling nucleation phenomena.
Conclusions:
- Surface cavities, particularly those with concave geometry, can enhance nucleation by reducing the energy barrier.
- The statistical description of surface roughness is essential for predicting nucleation site density.
- This work provides insights into the fundamental mechanisms of boiling on engineered surfaces.
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