Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 14, Issue 3, Pages 2563-2572Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2014.8467
Keywords
Hydrogen Reduction Technique; Al2O3-Cu Hybrid Nanofluid; Turbulent Flow; Heat Transfer Enhancement; Pressure Drop
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Funding
- Department of Science and Technology (DST), Government of India [SR/FTP/ETA-042/2009]
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A study on fully developed turbulent convective heat transfer and pressure drop characteristics of Al2O3-Cu/water hybrid nanofluid flowing through a uniformly heated circular tube is presented in this paper. For this, Al2O3-Cu nanocomposite powder was synthesized in a thermo chemical route using hydrogen reduction technique and dispersed the hybrid nano powder in deionised water to form a stable hybrid nanofluid of 0.1% volume concentration. The prepared powder was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM) to confirm the chemical composition, determine the particle size and study the surface morphology. Stability of the nanofluid was ensured by pH and zeta potential measurements. The average heat transfer enhancement for Al2O3-Cu/water hybrid nanofluid is 8.02% when compared to pure water. The experimental results also showed that 0.1% Al2O3-Cu/water hybrid nanofluids have slightly higher friction factor compared to 0.1% Al2O3/water nanofluid. The empirical correlations proposed for Nusselt number and friction factor were well agreed with the experimental data.
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