Enhanced critical heat flux with single-walled carbon nanotubes bonded on metal surfaces

Gwang Hyeok Seo, Hayoung Hwang, Jongwoong Yoon, Taehan Yeo, Hong Hyun Son, Uiju Jeong, Gyoodong Jeun, Wonjoon Choi, Sung Joong Kim

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

This study investigates a novel and practical technique to improve the critical heat flux (CHF) of thermal devices by bonding a film of single-walled carbon nanotubes (SWCNTs) to metal surfaces. Various SWCNT film layers in thicknesses of 296, 613, 845, and 1432. nm were fabricated by vacuum filtration. Experimental work of surface characterization and pool boiling heat transfer was conducted with bare stainless steel grade 316 heaters and SWCNT-coated heaters in the deionized water under atmospheric pressure. Surface characterization of the CNT adhesion showed that SWCNT adhesion to the metal surface exhibited properties of a smooth porous medium with smaller roughness compared to the bare SS316 substrate. Wall superheat and applied heat flux were measured and high speed images of boiling process were captured at a rate of 1500 frames/s during respective tests. The CHF with the random SWCNT network-coated heater was observed to increase by up to 55% compared to the bare SS316 heater. The increased porosity with the adhesion of a random SWCNT network is believed responsible for the enhanced CHF. However, nucleate boiling heat transfer coefficient with SWCNT-coated heaters was reduced compared to the bare heaters due to the lower surface roughness.

Original languageEnglish
Pages (from-to)138-147
Number of pages10
JournalExperimental Thermal and Fluid Science
Volume60
DOIs
Publication statusPublished - 2015 Jan 1

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering
  • Chemical Engineering(all)
  • Aerospace Engineering
  • Nuclear Energy and Engineering

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