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Research Papers

Comparative Study on Heat Transfer Enhancement of Low Volume Concentration of Al2O3–Water and Carbon Nanotube–Water Nanofluids in Laminar Regime Using Helical Screw Tape Inserts

[+] Author and Article Information
Sandesh S. Chougule

Discipline of Mechanical Engineering,
Indian Institute of Technology Indore,
Indore, Madhya Pradesh 453446, India
e-mail: sandesh_chougule@yahoo.com

S. K. Sahu

Assistant Professor
ASME Member
Discipline of Mechanical Engineering,
Indian Institute of Technology Indore,
Indore, Madhya Pradesh 453446, India
e-mail: santosh.sahu04@gmail.com

1Corresponding author.

Manuscript received February 5, 2014; final manuscript received June 23, 2014; published online July 15, 2014. Assoc. Editor: Calvin Li.

J. Nanotechnol. Eng. Med 4(4), 040904 (Jul 15, 2014) (9 pages) Paper No: NANO-14-1009; doi: 10.1115/1.4027913 History: Received February 05, 2014; Revised June 23, 2014

An experimental study has been carried out to evaluate the heat transfer and friction factor characteristics of helical screw inserts in Al2O3–water and carbon nanotubes (CNT)–water nanofluids through a straight pipe in laminar flow regime with constant heat flux boundary condition. Tests have been performed by using 0.15% volume concentration Al2O3–water and CNT–water nanofluid with helical tape inserts of twist ratio (TR) = 1.5, 2.5, and 3. The helical screw tape inserts with CNT–water nanofluid exhibits higher thermal performance compared to Al2O3–water nanofluid. The maximum enhancement in heat transfer was obtained for CNT–water nanofluid with helical tape inserts of TR = 1.5. The increase in pressure drop of Al2O3–water nanofluid with helical screw tape inserts is found to be higher compared to CNT–water nanofluid with helical screw tape inserts at lower value of TR. For both the nanofluids (CNT–water and Al2O3–water), the thermal performance factor was found to be greater than unity for all TRs.

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Figures

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Fig. 4

(a) Geometrical configuration of helical screw tape inserts and (b) helical twisted tape inserts used in the present work and their geometries

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Fig. 3

Schematic diagram of test facility

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Fig. 2

Equilibrium contact angle on a plain copper surface: droplet resting on a level copper surface (a) pure water, (b) Al2O3–water nanofluid, and (c) CNT–water nanofluid

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Fig. 1

(a) SEM image at magnification of 20,000× of MWCNT particles and (b) SEM image at magnification of 20,000× of Al2O3 particles

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Fig. 7

Variation of Nusselt number with Peclet number nanocoolant

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Fig. 5

(a) Variation of thermal conductivity with temperature for nanofluids with 0.15% volume concentrations and (b) Variation of absolute viscosity with temperature for nanofluids with 0.15% volume concentrations

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Fig. 6

Comparison of experimental Nusselt number with Shah equation

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Fig. 10

Variation of friction factor with Peclet number

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Fig. 11

Variation of thermal performance factor with Peclet number

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Fig. 8

Enhancement in Nusselt number at different Peclet number

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Fig. 9

Variation of friction factor with Reynolds number

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