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Subcooled water quenching on a super-hydrophilic surface under atmospheric pressure SCIE SCOPUS

Title
Subcooled water quenching on a super-hydrophilic surface under atmospheric pressure
Authors
Kang, Jun-youngLee, Gi CheolKim, Moo HwanMoriyama, KiyofumiPark, Hyun Sun
Date Issued
2018-02
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
The goal of this work is (i) to evaluate the cooling rate on a super-hydrophilic surface as a function of the subcooled degree Delta T-sub of the liquid coolant, (ii) to analyze the contact heat transfer q ''(c) of the liquid-solid contact, and (iii) to investigate the mechanism of microbubble emission boiling (MEB). We fabricated a super-hydrophilic surface by anodic oxidation of a zirconium vertical rod, so called completely wettable surface (CWS), which had surface microstructures with super-hydrophilicity. The CWS results in a decrease of the cooling time t(cool) as compared with the Bare Zirconium surface (BZS) results under small Delta T-sub (t(cool) similar to 50% decrease for Delta T-sub = 0, 15, and 40 K, respectively). However, its surface effect is limited in the case of large Delta T-sub (t(cool) similar to within 5% for Delta T-sub = 60 and 75 K). The fast quench on the CWS under Delta T-sub, explained by the increase in minimum film-boiling temperature T-MFB and rewetting velocity U, is due to the liquid-solid contact. We evaluate the contact area A(c) and volumetric absorption rate of the liquid dV/dt by conducting liquid absorption experiments. The increase in A(c) and dV/dt contribute to an increase in q"(c), by forming the liquid film at the liquid-solid contact spot. The orders of the time scale between capillary-wicking and liquid-solid contact are comparable. Destabilization of the large vapor bubble is caused by an increase in q"(c), which is a major reason for MEB generation, and this mechanism enables the q" to be significantly high on the CWS under subcooled quenching. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
BOILING HEAT-TRANSFER; LIQUID-SOLID CONTACT; VAPOR BUBBLES; FILM; TEMPERATURE; SPHERES; POOL; NANOFLUIDS; COLLAPSE; ALUMINA
URI
https://oasis.postech.ac.kr/handle/2014.oak/50958
DOI
10.1016/j.ijheatmasstransfer.2017.09.006
ISSN
0017-9310
Article Type
Article
Citation
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, vol. 117, page. 538 - 547, 2018-02
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