Thermo-hydraulic characteristics of anatase titania nanofluids flowing through a circular conduit

Budi Kristiawan, Samsul Kamal, Suhanan, Yanuar

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The thermo-hydraulic characteristics of anatase titanium dioxide dispersed into distilled water with particle concentration of 0.1, 0.3, and 0.5 vol.% were investigated experimentally in this work. The influence of rheological behavior on hydrodynamic and convective heat transfer characteristics was evaluated under both laminar and turbulent flow conditions in a plain conduit and with twisted tape insert for twist ratio of 7. The nanofluids exhibited a strong shear-thinning behavior at low shear rate particularly higher particle concentration. The non-Newtonian titania nanofluids have also demonstrated a drag reduction phenomena in turbulent flow. At equal Reynolds number, the values of performance evaluation criterion in a conduit inserted a twisted tape were lower than those of in a plain conduit. It implies the unfavourable energy budget for twisted tape insert. The convective heat transfer coefficient does not gradually enhance with an increase of particle concentration. The flow features due mainly to the rheology of colloidal dispersions might be a reason for this phenomenon.

Original languageEnglish
Pages (from-to)6078-6085
Number of pages8
JournalJournal of Nanoscience and Nanotechnology
Volume16
Issue number6
DOIs
Publication statusPublished - 1 Jun 2016

Keywords

  • Drag reduction
  • Nanofluids
  • Rheology
  • Thermo-hydraulic
  • Titania nanoparticles

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