Application of silver nanofluid containing oleic acid surfactant in a thermosyphon economizer

Witharana, S, Parametthanuwat, T, Rittidech, S, Pattiya, A and Ding, Y (2011) Application of silver nanofluid containing oleic acid surfactant in a thermosyphon economizer. Nanoscale Research Letters, 6:315. ISSN 1556-276X

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Abstract

This article reports a recent study on the application of a two-phase closed thermosyphon (TPCT) in a thermosyphon for economizer (TPEC). The TPEC had three sections of equal size; the evaporator, the adiabatic section, and the condenser, of 250 mm × 250 mm × 250 mm (W × L × H). The TPCT was a steel tube of 12.7-mm ID. The filling ratios chosen to study were 30, 50, and 80% with respect to the evaporator length. The volumetric flow rates for the coolant (in the condenser) were 1, 2.5, and 5 l/min. Five working fluids investigated were: water, water-based silver nanofluid with silver concentration 0.5 w/v%, and the nanofluid (NF) mixed with 0.5, 1, and 1.5 w/v% of oleic acid (OA). The operating temperatures were 60, 70, and 80°C. Experimental data showed that the TPEC gave the highest heat flux of about 25 kW/m2 and the highest effectiveness of about 0.3 at a filling ratio of 50%, with the nanofluid containing 1 w/v% of OA. It was further found that the effectiveness of nanofluid and the OA containing nanofluids were superior in effectiveness over water in all experimental conditions came under this study. Moreover, the presence of OA had clearly contributed to raise the effectiveness of the nanofluid.

Item Type:	Article
Copyright, Publisher and Additional Information:	© 2011 Parametthanuwat et al; licensee Springer. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords:	nanofluids, heat transfer, oleic acid, thermosyphon, heat exchanger, effectiveness
Academic Units:	The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	12 Sep 2011 14:18
Last Modified:	08 Feb 2013 17:33
Published Version:	http://dx.doi.org/10.1186/1556-276X-6-315
Status:	Published
Publisher:	SpringerOpen
Identification Number:	10.1186/1556-276X-6-315
URI:	http://eprints.whiterose.ac.uk/id/eprint/43263

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