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Title: Experimental study of heat transfer augmentation in non-circular duct using combined nanofluids and vortex generator
Authors: Ahmed, H.E. 
Ahmed, M.I. 
Yusoff, M.Z. 
Hawlader, M.N.A. 
Al-Ani, H. 
Issue Date: 2015
Abstract: This study presents the effect of nanofluid and vortex generators compound on heat transfer and friction factor in an equilateral triangular duct experimentally. Two different types of nanofluids namely, Al<inf>2</inf>O<inf>3</inf> and SiO<inf>2</inf> nanoparticles suspended in distilled water (DW) with two particle concentrations were successfully prepared and tested. A wide range of Reynolds number was covered from 500 to 8000, approximately. The results of smooth triangular duct using water as a working fluid were validated with literatures and a good agreement was obtained. The present results show a good enhancement in heat transfer by using vortex generator with base fluid while a significant enhancement was registered by using the compound of vortex generator and nanofluids accomplished with a moderate increase in the friction factor. The maximum enhancement in the Nusselt number obtained in this study is 44.64% and 41.82% at 1 vol.% and Re ≈ 4000 for SiO<inf>2</inf>-DW and Al<inf>2</inf>O<inf>3</inf>-DW nanofluid, respectively. © 2015 Elsevier Ltd. All rights reserved.
Appears in Collections:COE Scholarly Publication

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