The effect of surface area on pool boiling heat transfer coefficient and CHF of Al2O3/water nanofluids

Eung Surk Kim, Jung Yeul Jung, Yong Tae Kang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In this study, pool-boiling experiments are carried out to find out the influence of nanoparticles on boiling heat transfer coefficient and CHF. Each surface of the heater is visualized with FE-SEM and AFM after the experiments to figure out the effective boiling areas. The CHF increases up to 103% (compared to pure water) as the particle concentration increases until 0.001 vol% while it starts to decrease gradually as the particle concentration increases more than 0.001 vol%. It is found that the increase of CHF is proportional to the effective boiling surface area and the reduction of boiling heat transfer coefficient (BHTC) is mainly attributed to the blocking of the active nucleation cavity and the increase of the heat transfer resistance by nanoparticle deposition on the boiling surface. Finally, this study proposes a novel mechanism for BHTC reduction and CHF enhancement by nanofluids by considering the effective surface area variation.

Original languageEnglish
Pages (from-to)3177-3182
Number of pages6
JournalJournal of Mechanical Science and Technology
Volume27
Issue number10
DOIs
Publication statusPublished - 2013 Oct 1
Externally publishedYes

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Keywords

  • Boiling
  • Critical heat flux (CHF)
  • Heat transfer coefficient
  • Nanoparticle
  • Surface area

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering

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