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Research Papers: Forced Convection

Laminar Heat Transfer Enhancement Utilizing Nanofluids in a Chaotic Flow

[+] Author and Article Information
A. Tohidi

Department of Mechanical Engineering,
Yadegar–e-Imam Khomeini (RAH) Branch,
Islamic Azad University,
Tehran, Iran
e-mail: tohidi@iausr.ac.ir

S. M. Hosseinalipour

CFD and CAE Laboratory,
Department of Mechanical Engineering,
Iran University of Science and Technology,
Tehran, Iran
e-mail: alipour@iust.ac.ir

Z. Ghasemi Monfared

CFD and CAE Laboratory,
Department of Mechanical Engineering,
Iran University of Science and Technology,
Tehran, Iran
e-mail: zahra_ghasemi_77@yahoo.com

A. S. Mujumdar

Department of Bioresource Engineering,
McGill University,
Montreal, QC H3A 0G4, Canada
e-mail: arunmujumdar123@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 28, 2014; final manuscript received May 6, 2014; published online June 27, 2014. Assoc. Editor: Oronzio Manca.

J. Heat Transfer 136(9), 091704 (Jun 27, 2014) (8 pages) Paper No: HT-14-1101; doi: 10.1115/1.4027773 History: Received February 28, 2014; Revised May 06, 2014

This work numerically examined effects of nanofluids flow on heat transfer in a C-shaped geometry with the aim to evaluate potential advantages of using nanofluids in a chaotic flow. Numerical computations revealed that the combination of nanofluids and chaotic advection can be an effective way to improve thermal performance of laminar flows. The results indicated that addition of only 1–3% CuO or Al2O3 nanoparticles (volumetric concentration) to the chaotic flow improved heat transfer by 4–14% and 4–18%, respectively, with a marginal increase in the pressure drop.

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Figures

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Fig. 1

(a) Velocity and (b) temperature contours at different cross sections in C-shaped channel at Re = 300

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Fig. 2

Comparison of computed heat transfer coefficient and experimental data [20] for water and nanofluid

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Fig. 3

(a) Velocity and (b) temperature contours at different cross sections in C-shaped channel at Re = 300

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Fig. 4

Two fluid particle trajectories in C-shaped channel at Re = 300

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Fig. 5

(a) h, (b) f, and (c) h/f variations with the channel length (S) at Re = 300

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Fig. 10

Variations of h/f with Re for nanofluids with (a) 1%, (b) 2%, and (c) 3% concentration

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Fig. 9

Variations of f with Re for nanofluids with (a) 1%, (b) 2%, and (c) 3% concentration

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Fig. 8

Variations of h with Re for nanofluids with (a) 1%, (b) 2%, and (c) 3% concentration

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Fig. 7

Evolutions of (a) h, (b) f, and (c) h/f with Re for CuO nanofluid

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Fig. 6

Evolutions of (a) h, (b) f, and (c) h/f with Re for Al2O3 nanofluid

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