Near-wall velocity profile measurement for nanofluids

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

We perform near-wall velocity measurements of a SiO2-water nanofluid inside a microchannel. Nanoparticle image velocimetry measurements at three visible depths within 500 nm of the wall are conducted. We evaluate the optical properties of the nanofluid and their effect on the measurement technique. The results indicate that the small effect of the nanoparticles on the optical properties of the suspension have a negligible effect on the measurement technique. Our measurements show an increase in nanofluid velocity gradients near the walls, with no measurable slip, relative to the equivalent basefluid flow. We conjecture that particle migration induced by shear may have caused this increase. The effect of this increase in the measured near wall velocity gradient has implications on the viscosity measurement for these fluids.

Original languageEnglish
Article number015308
JournalAIP Advances
Volume6
Issue number1
DOIs
Publication statusPublished - 1 Jan 2016

    Fingerprint

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this