Separate effects of surface roughness, wettability, and porosity on the boiling critical heat flux

Author(s)
O'Hanley, Harrison F.; Coyle, Carolyn P.; Buongiorno, Jacopo; McKrell, Thomas J.; Hu, Lin-Wen; ... Show more
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Abstract
The separate effects of surface wettability, porosity, and roughness on the critical heat flux (CHF) of water were examined using engineered surfaces. Values explored were 0, 5, 10, and 15 μm for Rz (roughness), <5°, ∼75°, and >110° for static contact angle (wettability), and 0 and 50% for pore volume fraction. The porous hydrophilic surface enhanced CHF by 50%–60%, while the porous hydrophobic surface resulted in a reduction of CHF by 97%. Wettability had little effect on the smooth non-porous surface CHF. Surface roughness (Ra , Rq , Rz ) had no effect on CHF within the limit of this database.
Date issued
2013-07
URI
http://hdl.handle.net/1721.1/86912
Department
MIT Materials Research Laboratory; Massachusetts Institute of Technology. Department of Chemical Engineering; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; MIT Nuclear Reactor Laboratory
Journal
Applied Physics Letters
Publisher
American Institute of Physics
Citation
O’Hanley, Harry, Carolyn Coyle, Jacopo Buongiorno, Tom McKrell, Lin-Wen Hu, Michael Rubner, and Robert Cohen. “Separate Effects of Surface Roughness, Wettability, and Porosity on the Boiling Critical Heat Flux.” Appl. Phys. Lett. 103, no. 2 (2013): 024102.
Version: Author's final manuscript
ISSN
00036951
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