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MICRO/NANOSCALE HEAT TRANSFER—PART II

Heat Transfer Augmentation of Aqueous Suspensions of Nanodiamonds in Turbulent Pipe Flow

[+] Author and Article Information
Shuichi Torii

Department of Mechanical System Engineering, Kumamoto University, 2-39-1, Kurokami, Kumamoto 860-8550, Japantorii@mech.kumamoto-u.ac.jp

Wen-Jei Yang

Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109wjyang@engin.umich.edu

J. Heat Transfer 131(4), 043203 (Feb 13, 2009) (5 pages) doi:10.1115/1.3072923 History: Received April 11, 2008; Revised October 02, 2008; Published February 13, 2009

This paper aims to study the convective heat transfer behavior of aqueous suspensions of nanodiamond particles flowing through a horizontal tube heated under a constant heat flux condition. Consideration is given to the effects of particle concentration and Reynolds number on heat transfer enhancement. It is found that (i) significant enhancement of heat transfer performance due to suspension of nanodiamond particles in the circular tube flow is observed in comparison with pure water as the working fluid, (ii) the enhancement is intensified with an increase in the Reynolds number and the nanodiamond concentration, and (iii) substantial amplification of heat transfer performance is not attributed purely to the enhancement of thermal conductivity due to suspension of nanodiamond particles.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Nanofluids after 60 days (a) 0.4% (b) 1%

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Figure 2

TEM image of nanodiamond particles

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Figure 3

Experimental apparatus

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Figure 4

Experimental and theoretical results of nanofluids viscosity for different volume fractions

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Figure 5

Streamwise variation of heat transfer coefficient of nanofluids for different volume fractions

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Figure 6

Comparison of theoretical results of thermal conductivity for different nanoparticle materials

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Figure 7

Effect of nanoparticle concentration on Nusselt number as a function of Reynolds number

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