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Experimental and numerical investigation of heat transfer in CNT nanofluids

Rashmi, W. and Khalid, M. and Ismail, Ahmad Faris and Saidur, R. and Rashid, A. K. (2013) Experimental and numerical investigation of heat transfer in CNT nanofluids. Journal of Experimental Nanoscience, 10 (7). pp. 1-19. ISSN 1745-8099

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Nanofluids with their enhanced thermal conductivity are believed to be a promising coolant in heat transfer applications. In this study, carbon nanotube (CNT) nanofluids of 0.01 wt%, stabilised by 1.0 wt% gum arabic were used as a cooling liquid in a concentric tube laminar flow heat exchanger. The flow rate of cold fluid varied from 10 to 50 g/s. Both experimental and numerical simulations were carried out to determine the heat transfer enhancement using CNT nanofluids. Computational fluid dynamics (CFD) simulations were carried out using Fluent v 6.3 by assuming single-phase approximation. Thermal conductivity, density and rheology of the nanofluid were also measured as a function of temperature. The results showed thermal conductivity enhancement from 4% to 125% and nearly 70% enhancement in heat transfer with increase in flow rate. Numerical results exhibited good agreement with the experimental results with a deviation of 3%. CNT nanofluids at 0.01 wt% CNTs showed Newtonian behaviour with no significant increase in the density.

Item Type: Article (Journal)
Additional Information: 1743/36777
Uncontrolled Keywords: thermal conductivity; density; rheology; heat transfer; computational fluid dynamics
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA349 Mechanics of engineering. Applied mechanics
T Technology > TP Chemical technology > TP155 Chemical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Engineering > Department of Mechanical Engineering
Kulliyyah of Engineering
Depositing User: Prof Dr Ahmad Faris Ismail
Date Deposited: 30 May 2014 09:23
Last Modified: 05 Nov 2020 09:15
URI: http://irep.iium.edu.my/id/eprint/36777

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