Related Experiment Videos
High heat flux cooling by microbubble emission boiling
Koichi Suzuki1, Hiroshi Saitoh, Kazuaki Matsumoto
1Department of Mechanical Engineering, Faculty of Science and Technology, Science University of Tokyo, Chiba, Japan. suzuki@rs.noda.tus.ac.jp
Annals of the New York Academy of Sciences
|November 26, 2002
Summary
Microbubble emission boiling significantly enhances heat flux in subcooled flow, exceeding critical heat flux limits. This advanced cooling method achieves extremely high heat transfer rates, ideal for demanding applications like electronics cooling.
Area of Science:
- Heat Transfer
- Fluid Dynamics
- Phase Change Phenomena
Background:
- Subcooled flow boiling is crucial for efficient heat removal in various industrial applications.
- Existing cooling technologies face limitations in handling high heat loads.
- Understanding boiling regimes is key to optimizing heat transfer performance.
Purpose of the Study:
- Investigate microbubble emission boiling in subcooled flow boiling.
- Determine the maximum achievable heat flux in different channel geometries.
- Assess the potential of microbubble emission boiling for high-heat-flux cooling applications.
Main Methods:
- Experimental study of subcooled flow boiling of water in horizontal rectangular channels.
- Varying liquid subcooling, velocity, and channel cross-sections.
- Analysis of heat flux and boiling regimes, including microbubble emission boiling.
Main Results:
- Microbubble emission boiling observed at higher subcooling, surpassing critical heat flux.
- Maximum heat flux of 10 MW/m² achieved in a 12 mm x 14 mm channel.
- Heat fluxes up to 7 MW/m² in smaller channels, exceeding current CPU cooling limits.
Conclusions:
- Microbubble emission boiling offers a pathway to ultra-high heat flux cooling.
- Hydrodynamic forces play a dominant role in vapor-liquid exchange in strong convection.
- This boiling regime is promising for high-heat-flux cooling in electronics and microgravity environments.