The effects of hydrophilic/hydrophobic surface patterning on critical heat flux (CHF) and heat transfer coefficient (HTC) were studied using custom-engineered testing surfaces. Patterning was created over a sapphire substrate and tested in a pool boiling facility in MITs Reactor Hydraulics Laboratory. The hydrophilic and hydrophobic matrices were created using layer by layer deposition of 50 nm thick SiO2 nanoparticles and monolayer thickness fluorosilane, respectively. Ultraviolet ozone patterning was then used with chrome-printed masks to create the desired geometric features. Hexagon, ring, star, and mixed patterns were tested to determine their abilities to affect CHF and HTC through prevention of bubble pinning at high heat fluxes. During testing, an infrared camera was used to measure the surface temperature distribution as well as locate nucleation sites for data analysis. It was found that CHF values were enhanced over the bare sapphire values by approximately 90% for hexagons, 60% for stars, 65% for rings, and 50% for mixed patterns. Contrary to expectations, patterning did not seem to affect the HTC values significantly. Although patterning did improve CHF performance over bare heaters, both CHF and HTC were found to be statistically similar to those for unpatterned, uniformly hydrophilic surfaces.
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ASME 2013 Power Conference
July 29–August 1, 2013
Boston, Massachusetts, USA
Conference Sponsors:
- Power Division
ISBN:
978-0-7918-5606-2
PROCEEDINGS PAPER
Effects of Hydrophobic Surface Patterning on Boiling Heat Transfer and Critical Heat Flux of Water at Atmospheric Pressure
Carolyn Coyle,
Carolyn Coyle
Massachusetts Institute of Technology, Boston, MA
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Harry O’Hanley,
Harry O’Hanley
Massachusetts Institute of Technology, Boston, MA
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Bren Phillips,
Bren Phillips
Massachusetts Institute of Technology, Boston, MA
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Jacopo Buongiorno,
Jacopo Buongiorno
Massachusetts Institute of Technology, Boston, MA
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Thomas McKrell
Thomas McKrell
Massachusetts Institute of Technology, Boston, MA
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Carolyn Coyle
Massachusetts Institute of Technology, Boston, MA
Harry O’Hanley
Massachusetts Institute of Technology, Boston, MA
Bren Phillips
Massachusetts Institute of Technology, Boston, MA
Jacopo Buongiorno
Massachusetts Institute of Technology, Boston, MA
Thomas McKrell
Massachusetts Institute of Technology, Boston, MA
Paper No:
POWER2013-98146, V002T11A005; 6 pages
Published Online:
February 14, 2014
Citation
Coyle, C, O’Hanley, H, Phillips, B, Buongiorno, J, & McKrell, T. "Effects of Hydrophobic Surface Patterning on Boiling Heat Transfer and Critical Heat Flux of Water at Atmospheric Pressure." Proceedings of the ASME 2013 Power Conference. Volume 2: Reliability, Availability and Maintainability (RAM); Plant Systems, Structures, Components and Materials Issues; Simple and Combined Cycles; Advanced Energy Systems and Renewables (Wind, Solar and Geothermal); Energy Water Nexus; Thermal Hydraulics and CFD; Nuclear Plant Design, Licensing and Construction; Performance Testing and Performance Test Codes. Boston, Massachusetts, USA. July 29–August 1, 2013. V002T11A005. ASME. https://doi.org/10.1115/POWER2013-98146
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