Heat transfer characteristics and pressure drop of of COOH-functionalized DWCNTs/water nanofluid in turbulent flow at low concentrations
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Author list: Hemmat Esfe M., Saedodin S., Mahian O., Wongwises S.
Publisher: Elsevier
Publication year: 2014
Journal: International Journal of Heat and Mass Transfer (0017-9310)
Volume number: 73
Start page: 186
End page: 194
Number of pages: 9
ISSN: 0017-9310
eISSN: 1879-2189
Languages: English-Great Britain (EN-GB)
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Abstract
In this paper, an experimental study is performed to assess the heat transfer characteristics and pressure drop of low concentrations of a new class of nanotubes, i.e. COOH-functionalized double-walled carbon nanotubes (DWCNTs) suspended in water under turbulent flow in a double tube heat exchanger. First, the thermal conductivity and viscosity of nanofluids at volume fractions of 0.01%, 0.02%, 0.05%, 0.1%, 0.2%, and 0.4% are measured and corresponding correlations are presented. Next, the heat transfer and pressure drop of the nanofluids through the double tube heat exchanger are evaluated. The results indicate that even the use of low concentration of the nanofluid, i.e. 0.4%, leads to a remarkable increase in heat transfer coefficient (by 32%) in comparison with the distilled water. On the other hand, the pressure drop due to using the volume fraction of 0.4% raised by 20%. Finally, analysis of the heat transfer and pressure drop data via thermal performance factor reveals that in spite of the pressure drop penalty, the COOH-functionalized DWCNTs/water nanofluid with volume fraction of 0.4% is a good option to use in the double tube heat exchanger. ฉ 2014 Elsevier Ltd. All rights reserved.
Keywords
Functionalized carbon nanotube
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