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Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns
Published on: April 10, 2017
Microscale surface modifications for heat transfer enhancement.
Huseyin Bostanci1, Virendra Singh, John P Kizito
1Department of Mechanical and Aerospace Engineering, University of Central Florida , Orlando, Florida 32816, United States.
ACS Applied Materials & Interfaces
|September 6, 2013
Summary
Microscale surface modifications using grit blasting and plasma spray coating significantly enhance heat transfer in aluminum alloy 6061. These techniques boosted heat transfer coefficients by up to 76% in spray cooling applications for high power systems.
Area of Science:
- Materials Science
- Heat Transfer Engineering
- Surface Engineering
Background:
- Effective thermal management is crucial for high power systems.
- Surface modifications can significantly influence heat transfer performance.
- Two-phase heat transfer processes are vital in many cooling applications.
Purpose of the Study:
- To investigate the impact of particle blasting and plasma spray coating on heat transfer enhancement.
- To evaluate the effectiveness of microscale surface modifications on Al 6061.
- To assess heat transfer performance in spray cooling under high heat fluxes.
Main Methods:
- Al 6061 samples were modified using particle (grit) blasting and plasma spray coating.
- Surface characterization was performed using scanning electron microscopy (SEM) and confocal scanning laser microscopy.
- Heat transfer performance was evaluated in a spray cooling system using anhydrous ammonia at heat fluxes up to 500 W/cm(2).
Main Results:
- Surface modifications increased the actual surface area up to 2.8 times the projected area.
- Arithmetic mean roughness (Ra) increased from 0.3 μm to 19.5 μm.
- Heat transfer coefficients were enhanced by up to 76% at 500 W/cm(2) compared to smooth surfaces.
Conclusions:
- Microscale surface modifications are effective in enhancing two-phase heat transfer.
- Particle blasting and plasma spray coating are practical techniques for heat transfer enhancement.
- These modified surfaces show significant potential for thermal management in high power systems.
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