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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Published on: April 10, 2017
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Thermohydrodynamics of boiling in binary compressible fluids.
Jiewei Liu1, Minh Do-Quang1, Gustav Amberg1
1Department of Mechanics, The Royal Institute of Technology, 100 44 Stockholm, Sweden.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 14, 2015
Summary
This study numerically investigates boiling of a carbon dioxide and ethanol mixture on different surfaces. It reveals distinct behaviors in open versus closed systems, including preferential evaporation and unique vortex formation on lyophobic surfaces in closed systems.
Area of Science:
- Thermodynamics
- Fluid Dynamics
- Surface Science
Background:
- Boiling phenomena are crucial in various industrial applications.
- Understanding multi-component fluid behavior on surfaces is complex.
- Existing models may not fully capture nuanced thermohydrodynamic effects.
Purpose of the Study:
- To numerically investigate the thermohydrodynamics of boiling for a carbon dioxide + ethanol mixture.
- To analyze the effects of lyophilic and lyophobic surfaces in both closed and open systems.
- To propose and verify wetting boundary conditions for isothermal, two-component systems.
Main Methods:
- Utilizing a diffuse interface model for a two-component system.
- Performing numerical simulations of boiling processes.
- Developing and validating wetting boundary conditions for isothermal systems.
Main Results:
- Observed new phenomena, including preferential evaporation of the more volatile component.
- Demonstrated significantly different characteristics between open and closed systems.
- Noted similar qualitative features on lyophobic and lyophilic surfaces in open systems, contrasting with closed systems where vortices appeared only on lyophobic surfaces.
- Validated proposed boundary conditions even under non-uniform temperature conditions during boiling.
Conclusions:
- The study highlights the critical role of system type (open vs. closed) and surface properties in multi-component boiling.
- Proposed wetting boundary conditions are effective for isothermal, two-component systems, even in non-uniform temperature boiling.
- Further development of sophisticated boundary conditions for non-isothermal, two-component systems may be necessary.
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