Enabling Highly Effective Boiling from Superhydrophobic Surfaces

Physical Review Letters
Taylor P AllredSuresh V Garimella

Abstract

A variety of industrial applications such as power generation, water distillation, and high-density cooling rely on heat transfer processes involving boiling. Enhancements to the boiling process can improve the energy efficiency and performance across multiple industries. Highly wetting textured surfaces have shown promise in boiling applications since capillary wicking increases the maximum heat flux that can be dissipated. Conversely, highly nonwetting textured (superhydrophobic) surfaces have been largely dismissed for these applications as they have been shown to promote formation of an insulating vapor film that greatly diminishes heat transfer efficiency. The current Letter shows that boiling from a superhydrophobic surface in an initial Wenzel state, in which the surface texture is infiltrated with liquid, results in remarkably low surface superheat with nucleate boiling sustained up to a critical heat flux typical of hydrophilic wetting surfaces, and thus upends this conventional wisdom. Two distinct boiling behaviors are demonstrated on both micro- and nanostructured superhydrophobic surfaces based on the initial wetting state. For an initial surface condition in which vapor occupies the interstices of the surface text...Continue Reading

References

Jun 24, 2003·Nature Materials·Aurélie Lafuma, David Quéré
Aug 11, 2004·Langmuir : the ACS Journal of Surfaces and Colloids·Neelesh A Patankar
May 29, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·Susmita DashSuresh V Garimella
Aug 30, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Md Mahamudur RahmanMatthew McCarthy
Sep 9, 2015·Nature Communications·Navdeep Singh DhillonKripa K Varanasi
May 19, 2017·Scientific Reports·Biao ShenYasuyuki Takata

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Citations

Jan 9, 2019·ACS Applied Materials & Interfaces·Chang LiYongmei Zheng
May 1, 2020·ACS Applied Materials & Interfaces·Matic MožeIztok Golobič

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