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Research Papers

Convective Heat Transfer Characteristics of Silver-Water Nanofluid Under Laminar and Turbulent Flow Conditions

[+] Author and Article Information
Lazarus Godson1

Department of Mechanical Engineering,  Karunya University, Coimbatore, Tamil Nadu 641 114, Indiagodasir@yahoo.co.in

B. Raja

 Indian Institute of Information Technology, Design and Manufacturing (IIITD&;M), Kancheepuram, Chennai, Tamil Nadu 600 048, Indiarajab@iiitdm.ac.in

D. Mohan Lal

Department of Mechanical Engineering,  Anna University, Chennai, Tamil Nadu 600 025, Indiamohanlal@annauniv.edu

S. Wongwises

Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab. (FUTURE), Department of Mechanical Engineering,  King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand; The Academy of Science,  The Royal Institute of Thailand, Sanam Suea Pa, Dusit, Bangkok 10300, Thailandsomchai.won@kmutt.ac.th

1

Corresponding author.

J. Thermal Sci. Eng. Appl 4(3), 031001 (Jul 12, 2012) (8 pages) doi:10.1115/1.4006027 History: Received April 06, 2011; Revised January 24, 2012; Published July 12, 2012; Online July 12, 2012

The convective heat transfer coefficient and pressure drop of silver-water nanofluids is measured in a counter flow heat exchanger from laminar to turbulent flow regime. The experimental results show that the convective heat transfer coefficient of the nanofluids increases by up to 69% at a concentration of 0.9 vol. % compared with that of pure water. Furthermore, the experimental results show that the convective heat transfer coefficient enhancement exceeds the thermal conductivity enhancement. It is observed that the measured heat transfer coefficient is higher than that of the predicted ones using Gnielinski equation by at least 40%. The use of the silver nanofluid has a little penalty in pressure drop up to 55% increase 0.9% volume concentration of silver nanoparticles.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the experimental apparatus

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Figure 2

Data reduction flow chart

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Figure 3

Thermal conductivity ratio and viscosity ratio of silver-water nanofluids as a function of temperature

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Figure 4

Variation of temperature of nanofluids against axial positions

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Figure 5

Variation of heat transfer coefficient ratio (hnf /hw ) against Reynolds number

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Figure 6

Comparison of experimental and theoretical heat transfer coefficient

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Figure 7

Effect of volume fraction and Reynolds number on Nusselt number

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Figure 8

Enhancement of heat transfer coefficient against axial positions

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Figure 9

Variation of local heat transfer coefficients of nanofluids against axial positions

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Figure 10

Variation in pressure drop against Reynolds number

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