Pool boiling on a superhydrophilic surface

By Y. Takata, S. Hidaka, M. Masuda, Takehiro Ito. 2003

204 citations recorded by the source corpus.

Titanium Dioxide, TiO2, is a photocatalyst with a unique characteristic. A surface coated with TiO2 exhibits an extremely high affinity for water when exposed to UV light and the contact angle decreases nearly to zero. Inversely, the contact angle increases when the surface is shielded from UV. This superhydrophilic nature gives a self‐cleaning effect to the coated surface and has already been applied to some construction materials, car coatings and so on. We applied this property to the enhancement of boiling heat transfer. An experiment involving the pool boiling of pure water has been performed to make clear the effect of high wettability on heat transfer characteristics. The heat transfer surface is a vertical copper cylinder of 17 mm in diameter and the measurement has been done at saturated temperature and in a steady state. Both TiO2‐coated and non‐coated surfaces were used for comparison. In the case of the TiO2‐coated surface, it is exposed to UV light for a few hours before experiment and it is found that the maximum heat flux (CHF) is about two times larger than that of the uncoated surface. The temperature at minimum heat flux (MHF) for the superhydrophilic surface is higher by 100 K than that for the normal one. The superhydrophilic surface can be an ideal heat transfer surface. Copyright © 2002 John Wiley & Sons, Ltd.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/f680fd86e230090d134db6eeb73e421c485ca1f2

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Citations in the corpus

Single bubble dynamics on a superhydrophilic surface with artificial nucleation sites (2011, background): “Previous studies reported significant increases in the critical heat flux for pool boiling [2] and water jet impingement cooling [3] on superhydrophilic surfaces with apparent contact angles <10 .”
Fabrication and Characterization of the Capillary Performance of Superhydrophilic Cu Micropost Arrays (2010, background): “Poor wettability of water on copper surfaces, however, may compromise their phase change heat transfer performance [6], [7].”
Review of pool boiling enhancement by surface modification (2019, background): “[420,421] observed a two-fold increase in CHF for water and enhanced nucleate boiling heat transfer with a TiO2 sputtered copper surface compared to an uncoated surface.”