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Experimental and numerical investigation of heat transfer in CNT nanofluids

Rashmi, Walvekar and Siddiqui, Mohammad Khalid and Ismail, Ahmad Faris and Saidur, R. and Rashid, A. K. (2015) Experimental and numerical investigation of heat transfer in CNT nanofluids. Journal of Experimental Nanoscience, 10 (7). pp. 545-563. ISSN 1745-8099

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Abstract

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 +-3:0%. CNT nanofluids at 0.01 wt% CNTs showed Newtonian behaviour with no significant increase in the density.

Item Type: Article (Journal)
Additional Information: 1743/42765
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TP Chemical technology
Kulliyyahs/Centres/Divisions/Institutes: Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User: Prof Dr Ahmad Faris Ismail
Date Deposited: 07 May 2015 02:01
Last Modified: 07 Nov 2017 03:36
URI: http://irep.iium.edu.my/id/eprint/42765

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