Amelioration of the pool boiling heat transfer performance via self-assembling of 3D porous graphene/carbon nanotube hybrid film over the heating surface

Nurettin Sezer, Shoukat Alim Khan, Muammer Koç

Research output: Contribution to journalArticle

Abstract

This study investigates the boiling heat transfer enhancement of 3D porous graphene/carbon nanotube hybrid surface formed via self-assembling. Experimentally, colloidal suspensions of functionalized carbon nanotubes and graphene oxide (at 1:10 wt ratio) and only graphene oxide in water are prepared via sonication using three weight concentrations; 0.00005%, 0.0005%, and 0.005%. Boiling tests are conducted for each prepared fluid using a custom-made boiling apparatus. After boiling tests, Scanning Electron Microscopy analysis is carried out over the heating surfaces in order to observe the deposition behavior of the suspended nanoparticles. For wettability analysis, the contact angle of sessile water droplets on the heating surfaces are measured using the goniometry method. The boiling performance of the heating surface formed by self-assembling of graphene oxide/functionalized carbon nanotube outperforms the self-assembled graphene oxide-only surface with greater critical heat flux and heat transfer coefficient values at all the tested concentrations. A decent interfacial contact of graphene sheets and carbon nanotubes improves surface capillarity and thermal activity. The highly porous surface improves the nucleation site density, bubble departure diameter, and frequency of departure. All these factors contribute enhancement of heat transfer coefficient and critical heat flux.

Original languageEnglish
Article number118732
JournalInternational Journal of Heat and Mass Transfer
Volume145
DOIs
Publication statusPublished - 1 Dec 2019

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Keywords

  • Boiling curve
  • Boiling heat transfer
  • Carbon nanotubes
  • Colloids
  • Critical heat flux
  • Graphene
  • Heat transfer coefficient
  • Hybrid

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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