Estimation of thermal conductivity of nanofluid using experimental effective particle volume

Hyun Uk Kang, Sung Hyun Kim, Je Myung Oh

Research output: Contribution to journalArticle

292 Citations (Scopus)

Abstract

The thermal conductivities of nanofluid containing a small amount of ultra-dispersed diamond (UDD), silver, and silica nanoparticles were measured using a transient hot-wire method. To explain the enhancement of thermal conductivity of nanofluid, the effective volume of nanoparticles was used instead of the real volume to predict the thermal conductivity of nanofluid. The liquid layering on the surface of nanoparticles may be described as the effective volume of nanoparticles. This liquid layering is one important mechanism of the heat transfer in nanofluids. The effective volume of nanoparticles was estimated from high shear viscosity of nanofluid using the Einstein equation. The Hamilton-Crosser model with an effective volume fraction of nanoparticles resulted in better correlation for the thermal conductivities of nanofluids.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalExperimental Heat Transfer
Volume19
Issue number3
DOIs
Publication statusPublished - 2006 Sep 1

Keywords

  • Effective thermal conductivity
  • Effective volume fraction
  • Nanofluid
  • Viscosity

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Instrumentation
  • Electrical and Electronic Engineering

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