Enhanced pool boiling critical heat flux of water using carbon nanotubes adhesion on stainless steel heaters

Gwang Hyeok Seo, Jongwoong Yoon, Sung Joong Kim, Hayoung Hwang, Taehan Yeo, Wonjoon Choi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This study investigates a novel and practical technique to improve the thermal safety margin of the thermal devices by introducing the Single-Walled Carbon Nanotubes (SWCNTs) adhesion on metal surfaces. As a quantitative measure of the thermal safety margin, critical heat flux is introduced and relevant experimental work has been conducted with bare stainless steel grade 316 heaters and CNT-coated heaters. CNTs were adhered to the metal substrate of SS316, whose dimension is 16×4×2 mm3 in length, width, and thickness, respectively. Various CNTs layer thicknesses of 280, 569, 960, and 1400 nm were fabricated. Bare and CNT-coated SS316 heaters were electrically heated via Joule heating using 12 kW DC power supply of 1200A-10V in the pool of deionized water at atmospheric pressure. After fabricating the CNT adhesion, surface characterization of SEM, AFM, roughness, contact angle measurement was conducted. This clearly shows that CNT adhesion to the metal surface exhibits smooth porous media but with smaller roughness compared to bare SS316 substrate. Wall superheat and applied heat flux were measured for bare and CNT-coated heaters. High speed images of boiling process were captured during respective tests at a rate of 1500 frames/sec. It is observed that CHF with CNT-coated heater increases by up to 55% as compared to the bare SS316 heater, which suggests that safety margin is improved significantly using the CNT adhesion on the metal surfaces. However, nucleate boiling heat transfer coefficient is reduced due to the lower surface roughness.

Original languageEnglish
Title of host publicationEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
PublisherAmerican Nuclear Society
Pages496-514
Number of pages19
ISBN (Electronic)9781632668509
Publication statusPublished - 2014
EventEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting - Reno, United States
Duration: 2014 Jun 152014 Jun 19

Other

OtherEmbedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting
CountryUnited States
CityReno
Period14/6/1514/6/19

Keywords

  • Carbon Nanotube
  • Critical heat flux
  • Pool boiling heat transfer
  • Safety margin

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Geotechnical Engineering and Engineering Geology
  • Nuclear Energy and Engineering

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  • Cite this

    Seo, G. H., Yoon, J., Kim, S. J., Hwang, H., Yeo, T., & Choi, W. (2014). Enhanced pool boiling critical heat flux of water using carbon nanotubes adhesion on stainless steel heaters. In Embedded Topical Meeting on Advances in Thermal Hydraulics, ATH 2014, Held at the American Nuclear Society 2014 Annual Meeting (pp. 496-514). American Nuclear Society.