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Effects of capillarity on pool boiling using nano-textured surfaces through electrosprayed BiVO4 nano-pillars

Authors
Jo, Hong SeokKim, Min-WooKim, KaramAn, SeongpilKim, Yong IlJames, Scott C.Choi, JeehoonYoon, Sam S.
Issue Date
2-11월-2017
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Keywords
Electrospraying; Bismuth vanadate; Pool boiling; Superheat temperature; Critical heat flux
Citation
CHEMICAL ENGINEERING SCIENCE, v.171, pp.360 - 367
Indexed
SCIE
SCOPUS
Journal Title
CHEMICAL ENGINEERING SCIENCE
Volume
171
Start Page
360
End Page
367
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81586
DOI
10.1016/j.ces.2017.05.028
ISSN
0009-2509
Abstract
Pool boiling is a mechanism by which heat is removed by changing the phase of a coolant from liquid to vapor. Surface wettability, which drives coolant capillarity, has a profound effect on the boiling process. We demonstrate pool boiling enhancement through wettability control using electrosprayed, nano textured surfaces of bismuth vanadate (BiVO4). When a BiVO4 liquid precursor is electrostatically charged and sprayed, submicron droplets are formed and their acceleration is driven by the electrostatic force established between the nozzle exit and substrate. As droplets approach the substrate, Brownian diffusion takes place and an opposing thermophoretic force impedes the dynamic motion of evaporating droplets. As a result, nano-pillars are formed, whose physical sizes change the wettability of a surface and change pool-boiling phenomenon. The surface wettabilities of nano-textured surfaces were quantified with the water contact angle. Increased spraying time resulted in greater nano-pillar structure heights. Both the critical heat flux and effective heat transfer coefficient increased with nano-pillar height. However, excessively tall pillars had an adverse effect on pool-boiling through trapping of nucleated bubbles near the heat surface, which hindered efficient heat transfer. (C) 2017 Published by Elsevier Ltd.
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