Effect of surface orientation on pool boiling heat transfer of nanoparticle suspensions

G. Prakash Narayan, K. B. Anoop, G. Sateesh, Sarit K. Das

Research output: Contribution to journalArticle

47 Citations (Scopus)


Several investigators have found that there is a significant effect of surface orientation on pool boiling performance and mechanisms, when a pure liquid is boiled over tubular heating surfaces. However, there is no similar study reported in literature for pool boiling of nanoparticle suspensions. This paper investigates the effect nanoparticles, suspended in pure liquids, can have on nucleate pool boiling heat transfer at various surface orientations. Systematic experiments were conducted on a smooth tube (average surface roughness 48 nm) of diameter 33 mm and length 170 mm at various inclinations (0°, 45° and 90°). Electro-statically stabilized water-based nanoparticle suspensions containing alumina nanoparticles (primary average sizes 47 nm and 150 nm) of concentrations 0.25%, 1% and 2% percent by weight were used. It has been found that there is a significant effect of surface orientation on the heat transfer performance. Horizontal orientation gave maximum heat transfer and the heating surface, when inclined at 45°, gave minimum heat transfer. Further, it was observed that surface-particle interaction and modified bubble motion can explain the behavior.

Original languageEnglish
Pages (from-to)145-160
Number of pages16
JournalInternational Journal of Multiphase Flow
Issue number2
Publication statusPublished - 1 Feb 2008



  • Bubble sliding
  • Nanoparticles suspensions
  • Pool boiling
  • Surface orientation
  • Surface-particle interaction

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this