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

Hong Seok Jo, Min Woo Kim, Karam Kim, Seongpil An, Yong Il Kim, Scott C. James, Jeehoon Choi, Suk Goo Yoon

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)360-367
Number of pages8
JournalChemical Engineering Science
Volume171
DOIs
Publication statusPublished - 2017 Nov 2

Keywords

  • Bismuth vanadate
  • Critical heat flux
  • Electrospraying
  • Pool boiling
  • Superheat temperature

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering
  • Applied Mathematics

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