Journal Published Online: 21 November 2017
Volume 46, Issue 2

Rheological Behavior and Effective Thermal Conductivity of Non-Newtonian Nanofluids

CODEN: JTEVAB

Abstract

The rheological behavior and effective thermal conductivity of CMC-based non-Newtonian nanofluids were investigated. Non-Newtonian nanofluids of different concentrations were prepared by dispersing Fe2O3, γ-Al2O3 and CuOnanoparticles in three different concentrations of (0.5, 0.75, and 1.0 wt. %) aqueous carboxymethyl cellulose (CMC) solution (base fluid). Experiments were carried out to examine the effect of concentration of nanofluid and temperature on rheological behavior and effective thermal conductivity of non-Newtonian nanofluid. Viscosity and thermal conductivity were measured by rheometer and transient hot wire technique, respectively. The rheological characterization and thermal conductivity measurements were done in the range 30°C–50°C. Flow behavior index and consistency index were determined. As the concentration of nanofluid and temperature were increased, the thermal conductivity of nanofluid was found to increase. A correlation for predicting the thermal conductivity of non-Newtonian nanofluid was developed. The correlation predicted the thermal conductivity of non-Newtonian nanofluids reported by other researchers very well. The results obtained were compared with the model predictions from literature.

Author Information

Anil Kumar Naik, B.
Dept. of Chemical Engineering, National Inst. of Technology, Warangal, India
Vinod, A. V.
Dept. of Chemical Engineering, National Inst. of Technology, Warangal, India
Pages: 12
Price: $25.00
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Stock #: JTE20160518
ISSN: 0090-3973
DOI: 10.1520/JTE20160518