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Measurement of Optical Properties of Nanofluids and its Effects in Near-wall Flow Evaluation

Authors:
Anoop Kanjirakat
Reza Sadr

Keywords: Refractive index, transmittivity, nPIV

Abstract:
There have been several ongoing researches in nanofluids (suspensions of nanoparticles in a basefluid) due to the anomalous heat transfer enhancement that were reported earlier. Exploration of the near-wall flow region using Particle Image Velocimetry (PIV) technique could bring more insights for reasons behind such enhancements. However, such measurement techniques are extremely depended on the optical properties of the fluid under study. Hence prior measurements of the optical properties are necessary for estimating velocity values while implementing these fluids. In present study, optical properties of SiO2 –water nanofluids at various particle concentrations are investigated. Measurements of refractive indices and the optical transmittance of nanofluids, which are directly related to the depth of penetration and visible depth in nPIV (nano PIV) measurements, are carried out. Further, near-wall velocities of water and nanofluids are measured using nPIV technique as a case study.

Pages: 82 to 87

Copyright: Copyright (c) IARIA, 2013

Publication date: August 25, 2013

Published in: conference

ISSN: 2308-3530

ISBN: 978-1-61208-303-2

Location: Barcelona, Spain

Dates: from August 25, 2013 to August 31, 2013