Brownian-motion-based convective-conductive model for the effective thermal conductivity of nanofluids

Ravi Prasher, Prajesh Bhattacharya, Patrick Phelan

Research output: Contribution to journalArticle

374 Citations (Scopus)

Abstract

Here we show through an order-of-magnitude analysis that the enhancement in the effective thermal conductivity of nanofluids is due mainly to the localized convection caused by the Brownian movement of the nanoparticles. We also introduce a convective-conductive model which accurately captures the effects of particle size, choice of base liquid, thermal interfacial resistance between the particles and liquid temperature, etc. This model is a combination of the Maxwell-Garnett (MG) conduction model and the convection caused by the Brownian movement of the nanoparticles, and reduces to the MG model for large particle sizes. The model is in good agreement with data on water ethylene glycol, and oil-based nanofluids, and shows that the lighter the nanoparticles, the greater the convection effect in the liquid, regardless of the thermal conductivity of the nanoparticle.

Original languageEnglish (US)
Pages (from-to)588-595
Number of pages8
JournalJournal of Heat Transfer
Volume128
Issue number6
DOIs
StatePublished - Jun 2006

Fingerprint

Brownian movement
Thermal conductivity
thermal conductivity
Brownian movements
Nanoparticles
nanoparticles
convection
Liquids
liquids
Particle size
Ethylene Glycol
Ethylene glycol
glycols
Oils
ethylene
oils
conduction
Water
augmentation
water

Keywords

  • Brownian motion
  • Colloid
  • Nanofluid
  • Nanoscale heat transfer
  • Thermal conductivity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

Cite this

Brownian-motion-based convective-conductive model for the effective thermal conductivity of nanofluids. / Prasher, Ravi; Bhattacharya, Prajesh; Phelan, Patrick.

In: Journal of Heat Transfer, Vol. 128, No. 6, 06.2006, p. 588-595.

Research output: Contribution to journalArticle

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