Convective heat transfer for water-based alumina nanofluids in a single 1.02-mm tube

W. Y. Lai, S. Vinod, Patrick Phelan, Ravi Prasher

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

Nanofluids are colloidal solutions, which contain a small volume fraction of suspended submicron particles or fibers in heat transfer liquids such as water or glycol mixtures. Compared with the base fluid, numerous experiments have generally indicated an increase in effective thermal conductivity and a strong temperature dependence of the static effective thermal conductivity. However, in practical applications, a heat conduction mechanism may not be sufficient for cooling high heat dissipation devices such as microelectronics or powerful optical equipment. Thus, thermal performance under convective heat transfer conditions becomes of primary interest. We report here the heat transfer coefficient h in both developing and fully developed regions by using water-based alumina nanofluids. Our experimental test section consists of a single 1.02-mm diameter stainless steel tube, which is electrically heated to provide a constant wall heat flux. Both pressure drop and temperature differences are measured, but mostly here we report our h measurements under laminar flow conditions. An extensive characterization of the nanofluid samples, including pH, electrical conductivity, particle sizing, and zeta potential, is also documented. The measured h values for nanofluids are generally higher than those for pure water. In the developing region, this can be at least partially explained by Pr number effects.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalJournal of Heat Transfer
Volume131
Issue number11
DOIs
StatePublished - Nov 2009

Fingerprint

Aluminum Oxide
convective heat transfer
Alumina
aluminum oxides
tubes
Heat transfer
Water
Thermal conductivity
thermal conductivity
optical equipment
water
cooling
Glycols
sizing
Stainless Steel
Zeta potential
pressure drop
heat transfer coefficients
Heat losses
laminar flow

Keywords

  • Forced convection
  • Laminar flow
  • Nanofluid
  • Nanofluid characterization

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Convective heat transfer for water-based alumina nanofluids in a single 1.02-mm tube. / Lai, W. Y.; Vinod, S.; Phelan, Patrick; Prasher, Ravi.

In: Journal of Heat Transfer, Vol. 131, No. 11, 11.2009, p. 1-9.

Research output: Contribution to journalArticle

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