Nucleate boiling performance on nano/microstructures with different wetting surfaces.

Nanoscale Research Letters
Hangjin JoMoo Hwan Kim

Abstract

A study of nucleate boiling phenomena on nano/microstructures is a very basic and useful study with a view to the potential application of modified surfaces as heating surfaces in a number of fields. We present a detailed study of boiling experiments on fabricated nano/microstructured surfaces used as heating surfaces under atmospheric conditions, employing identical nanostructures with two different wettabilities (silicon-oxidized and Teflon-coated). Consequently, enhancements of both boiling heat transfer (BHT) and critical heat flux (CHF) are demonstrated in the nano/microstructures, independent of their wettability. However, the increment of BHT and CHF on each of the different wetting surfaces depended on the wetting characteristics of heating surfaces. The effect of water penetration in the surface structures by capillary phenomena is suggested as a plausible mechanism for the enhanced CHF on the nano/microstructures regardless of the wettability of the surfaces in atmospheric condition. This is supported by comparing bubble shapes generated in actual boiling experiments and dynamic contact angles under atmospheric conditions on Teflon-coated nano/microstructured surfaces.

References

Oct 18, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Xue H ZhangJun Hu
Jun 24, 2008·Small·Chen LiG P Peterson
Jan 20, 2009·Nano Letters·Renkun ChenArun Majumdar
Feb 26, 2010·Nano Letters·Antonio CheccoBenjamin M Ocko

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Citations

Apr 2, 2016·Scientific Reports·Chang-Ho ChoiChih-hung Chang
May 9, 2015·Advances in Colloid and Interface Science·B BourdonJ De Coninck
Oct 23, 2019·Journal of Colloid and Interface Science·Adnan KhalilAnnette Andrieu-Brunsen

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Methods Mentioned

BETA
scanning electron microscopy
X-ray

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