Experimental study of forced convective heat transfer of nanofluids in a microchannel

Kanjirakat Anoop, Reza Sadr, Jiwon Yu, Seokwon Kang, Saeil Jeon, Debjyoti Banerjee

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

The forced convective heat transfer for flow of water and aqueous nanofluids (containing colloidal suspension of silica nanoparticles) inside a microchannel was studied experimentally for the constant wall temperature boundary condition. Applications of nanofluids have been explored in the literature for cooling of micro-devices due to the anomalous enhancements in their thermo-physical properties as well as due to their lower susceptibility to clogging. The effect of flow rate on thermal performance of nanofluid is analyzed in this study. Variations of thermo-physical properties of the nanofluid samples were also measured. The experimental results show that heat transfer increases with flow rate for both water and nanofluid samples; however, for the nanofluid samples, heat transfer enhancements occur at lower flow rates and heat transfer degradation occurs at higher flow rates (compared to that of water). Electron microscopy of the heat-exchanging surface revealed that surface modification of the microchannel flow surface occurred due to nanoparticle precipitation from the nanofluid. Hence, the fouling of the microchannels by the nanofluid samples is believed to be responsible for the progressive degradation in the thermal performance, especially at higher flow rates. Hence, these results are observed to be consistent with previous experimental studies reported in the literature.

Original languageEnglish
Pages (from-to)1325-1330
Number of pages6
JournalInternational Communications in Heat and Mass Transfer
Volume39
Issue number9
DOIs
Publication statusPublished - Nov 2012

Fingerprint

convective heat transfer
microchannels
Microchannels
flow velocity
Flow rate
Heat transfer
heat transfer
thermophysical properties
Thermodynamic properties
water
degradation
Nanoparticles
Degradation
plugging
nanoparticles
Flow of water
exchanging
fouling
Water
augmentation

Keywords

  • Fouling
  • Nanofluids
  • Viscosity

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Chemical Engineering(all)
  • Condensed Matter Physics

Cite this

Experimental study of forced convective heat transfer of nanofluids in a microchannel. / Anoop, Kanjirakat; Sadr, Reza; Yu, Jiwon; Kang, Seokwon; Jeon, Saeil; Banerjee, Debjyoti.

In: International Communications in Heat and Mass Transfer, Vol. 39, No. 9, 11.2012, p. 1325-1330.

Research output: Contribution to journalArticle

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