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Research Papers: Micro/Nanoscale Heat Transfer

Effect of Particle Migration on Flow and Convective Heat Transfer of Nanofluids Flowing Through a Circular Pipe

[+] Author and Article Information
M. M. Heyhat

School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439957131, Iranmmheyhat@ut.ac.ir

F. Kowsary

School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439957131, Iranfkowsari@ut.ac.ir

J. Heat Transfer 132(6), 062401 (Mar 24, 2010) (9 pages) doi:10.1115/1.4000743 History: Received March 10, 2009; Revised November 02, 2009; Published March 24, 2010; Online March 24, 2010

This paper aims to study the effect of particle migration on flow and heat transfer of nanofluids flowing through a circular pipe. To do this, a two-component model proposed by Buongiorno (2006, “Convective Transport in Nanofluids  ,” ASME J. Heat Transfer, 128, pp. 240–250) was used and a numerical study on laminar flow of alumina-water nanofluid through a constant wall temperature tube was performed. The effects of nonuniform distribution of particles on heat-transfer coefficient and wall shear stress are shown. Obtained results illustrate that by considering the particle migration, the heat-transfer coefficient increases while the wall shear stress decreases, compared with uniform volume fraction. Thus, it can be concluded that the enhancement of the convective heat transfer could not be solely attributed to the enhancement of the effective thermal conductivity, and beside other reasons, which may be listed as this higher enhancement, particle migration is proposed to be an important reason.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 15

Dimensionless velocity profile at Re=600

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Figure 16

Dimensionless velocity profile at Re=2000

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Figure 14

Radial particle concentration distribution at Re=2000 and φm=0.05

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Figure 13

Radial particle concentration distribution at Re=600 and φm=0.03

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Figure 12

The effect of particle migration on the local wall shear stress at Re=2000 and φm=0.05

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Figure 11

The effect of particle migration on the local wall shear stress at Re=600 and φm=0.03

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Figure 10

The effect of particle migration on the averaged wall shear stress

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Figure 9

The effect of particle migration on the local heat-transfer coefficient at Re=2000 and φm=0.05

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Figure 8

The effect of particle migration on the local heat-transfer coefficient at Re=600 and φm=0.03

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Figure 7

The effect of particle migration on the averaged heat-transfer coefficient

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Figure 6

Wall heat-transfer coefficient ratio distribution at Re=2000

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Figure 5

Wall heat-transfer coefficient ratio distribution at Re=600

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Figure 4

Effect of nanoparticle volume fraction on the averaged heat-transfer coefficient ratio

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Figure 3

Comparison of the Shah equation and numerical results for local Nusselt number of pure water

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Figure 2

Comparison of the friction factors in fully developed region

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Figure 1

Grid layout and geometry of problem

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