Critical heat flux maxima during boiling crisis on textured surfaces

Nature Communications
Navdeep Singh DhillonKripa K Varanasi

Abstract

Enhancing the critical heat flux (CHF) of industrial boilers by surface texturing can lead to substantial energy savings and global reduction in greenhouse gas emissions, but fundamentally this phenomenon is not well understood. Prior studies on boiling crisis indicate that CHF monotonically increases with increasing texture density. Here we report on the existence of maxima in CHF enhancement at intermediate texture density using measurements on parametrically designed plain and nano-textured micropillar surfaces. Using high-speed optical and infrared imaging, we study the dynamics of dry spot heating and rewetting phenomena and reveal that the dry spot heating timescale is of the same order as that of the gravity and liquid imbibition-induced dry spot rewetting timescale. Based on these insights, we develop a coupled thermal-hydraulic model that relates CHF enhancement to rewetting of a hot dry spot on the boiling surface, thereby revealing the mechanism governing the hitherto unknown CHF enhancement maxima.

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Citations

Oct 7, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·An ZouShalabh C Maroo
Feb 22, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Nazanin FarokhniaHadi Ghasemi
Oct 7, 2016·Scientific Reports·Beom Seok KimHyung Hee Cho
May 5, 2017·ACS Applied Materials & Interfaces·Dong Il ShimHyung Hee Cho
Feb 9, 2017·Scientific Reports·Yunlai GaoKongjing Li
Mar 28, 2017·Scientific Reports·Beom Seok KimHyung Hee Cho
May 19, 2017·Scientific Reports·Biao ShenYasuyuki Takata
Jul 14, 2017·Scientific Reports·Abdolreza Fazeli, Saeed Moghaddam
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Mar 9, 2021·ACS Applied Materials & Interfaces·Youngsup SongEvelyn N Wang
Jun 27, 2021·Science Advances·Jiaqi LiNenad Miljkovic
Apr 7, 2018·Nano Letters·Qingyang Wang, Renkun Chen
Feb 14, 2019·ACS Applied Materials & Interfaces·Shakerur Ridwan, Matthew McCarthy
Oct 7, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Susmita DashKripa K Varanasi
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Dec 19, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Dahua Shou, Jintu Fan
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Oct 8, 2021·Scientific Reports·Konstantinos KaralisSergey V Churakov
Jul 7, 2021·Nature Communications·B HohermuthD Valero

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Methods Mentioned

BETA
scanning electron microscopy
scanning
atomic force microscopy

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