Wicking Enhanced Critical Heat Flux for Highly Wetting Fluids on Structured Surfaces

Langmuir : the ACS Journal of Surfaces and Colloids
Md Mahamudur RahmanMatthew McCarthy

Abstract

The use of micro/nano-scale structures has been shown to enhance critical heat flux (CHF) during pool boiling in recent studies. A correlation between wicking rate and CHF enhancement for structured superhydrophilic surfaces has been reported in prior work of the authors. In that work, a nondimensional correlation was developed and validated using only water as the working fluid. In this study, a highly wetting fluid (FC-72) was used to demonstrate the applicability of this correlation on structured surfaces for nonaqueous liquids. This has been achieved using a simple modification of the experimental procedure for highly wetting fluids. This experimental modification shows no effect on the quantification of the liquid wicking rate. Numerous structured superhydrophilic surfaces have been fabricated and tested, including micro- and nanoscale structures and hierarchical surfaces which showed the highest CHF enhancement (200%). More importantly, this work demonstrates the validity of the nondimensional parameters used in the proposed CHF correlation and its overall applicability to a wide range of nonaqueous liquids.

References

Jan 20, 2009·Nano Letters·Renkun ChenArun Majumdar
Jun 3, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Emre ÖlçeroğluMatthew McCarthy
Aug 30, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Md Mahamudur RahmanMatthew McCarthy
Aug 19, 2015·Scientific Reports·Md Mahamudur RahmanMatthew McCarthy
Feb 14, 2019·ACS Applied Materials & Interfaces·Shakerur Ridwan, Matthew McCarthy

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Citations

Jul 21, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Wei ChangChen Li
Jan 9, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Zhen CaoBengt Sundén

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