Related Experiment Videos
Effect of interfacial phenomena on dewetting in dropwise condensation
Shripad J Gokhale1, Joel L Plawsky, Peter C Wayner
1The Isermann Department of Chemical Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Advances in Colloid and Interface Science
|June 24, 2003
Summary
Investigating fluid dynamics during condensation, this study reveals how surface wettability impacts dewetting meniscus behavior. Surface properties significantly alter mass shedding, velocity, and curvature during dropwise condensation on quartz.
Area of Science:
- Surface Science
- Fluid Dynamics
- Condensation Phenomena
Background:
- Understanding fluid behavior during condensation is crucial for heat transfer and material science.
- Dewetting phenomena, particularly the dynamics of a receding meniscus, are complex and influenced by surface properties.
Purpose of the Study:
- To investigate the dynamics of a dewetting meniscus during dropwise condensation on modified quartz surfaces.
- To analyze the influence of surface wettability on meniscus behavior, including mass shedding, velocity, and curvature.
Main Methods:
- Utilized image-analyzing interferometry to observe meniscus dynamics.
- Modified quartz surfaces to achieve varying wettability (hydroxylated and slightly hydrophobic).
- Applied interfacial concepts and the Kelvin-Clapeyron model for analysis.
Main Results:
- Observed distinct meniscus behaviors based on surface wettability.
- On hydroxylated surfaces, the meniscus shed mass, and dewetting velocity decreased over time.
- On hydrophobic surfaces, a curvature gradient formed and diminished as the meniscus receded.
Conclusions:
- Surface wettability is a critical factor governing the dewetting dynamics of a meniscus during dropwise condensation.
- The observed phenomena align with interfacial concepts of spreading and phase change models.