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Research Papers

Buoyancy-Induced Natural Convective Heat Transfer Along a Vertical Cylinder Using Water–Al2O3 Nanofluids

[+] Author and Article Information
S. Ravi Babu

Department of Power Engineering,
GMR Institute of Technology,
GMR Nagar, Rajam,
Srikakulam (dt) 532127, Andhra Pradesh, India;
Department of Mechanical Engineering,
Acharya Nagarjuna University,
Guntur 522510, India
e-mail: ravibabu.s@gmrit.org

G. Sambasiva Rao

Professor
Sir C. R. Reddy College of Engineering,
Eluru 534007, Andhra Pradesh, India
e-mail: gutta39@yahoo.com

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 1, 2017; final manuscript received October 23, 2017; published online February 28, 2018. Assoc. Editor: Ranganathan Kumar.

J. Thermal Sci. Eng. Appl 10(3), 031005 (Feb 28, 2018) (7 pages) Paper No: TSEA-17-1059; doi: 10.1115/1.4038701 History: Received March 01, 2017; Revised October 23, 2017

Buoyancy-induced natural convective heat transfer along a vertical cylinder immersed in Water–Al2O3 nanofluids for various concentrations (0, 0.05, 0.1, 0.2, 0.4, 0.6 vol %) under constant heat flux condition was investigated experimentally and presented. Thermal stratification was observed outside the boundary layer in the ambient fluid after steady-state condition is achieved as the fluid temperature goes on increasing along the axial direction. Temperature variations of the cylinder along the axial direction and temperature variations of fluid in radial direction are shown graphically. It is observed that the temperatures of the cylinder and the fluid increases along the axial direction and the fluid temperature decreases in the radial direction. Experiments were conducted for various heat inputs (30 W, 40 W, 45 W, and 50 W) and volume concentrations and observed that the addition of alumina nanoparticles up to 0.1 vol % enhances the thermal performance and then the further addition of nanoparticles leads to deterioration. The maximum enhancement in the natural convection heat transfer performance is observed as 13.8%, i.e., heat transfer coefficient is increased from 382 W/m2 K to 435 W/m2 K at 0.1 vol % particle loading.

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Figures

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Fig. 4

(a) Photographic view of experimental setup and (b) schematic diagram of experimental setup [30]

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Fig. 3

X-ray diffraction analysis of Al2O3 nanoparticles

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Fig. 2

UV-Vis spectrophotometer reading of Al2O3 nanoparticles

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Fig. 1

Thermal conductivity measurement techniques

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Fig. 12

Variation of average heat transfer coefficient with Al2O3 nanoparticle concentration for different heat input

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Fig. 7

Local heat transfer coefficient with axial distance for water–Al2O3 nanofluid at 0.1 vol %

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Fig. 6

Surface temperature of vertical cylinder along axial direction for (water + EG)–Al2O3 at 0.1 vol %

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Fig. 5

Surface temperatures of vertical cylinder along axial direction for water–Al2O3 at 0.1 vol %

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Fig. 8

Local Nusselt number with axial distance for water–Al2O3 nanofluid at 0.1 vol %

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Fig. 9

Temperature distribution in the radial direction at middle of the cylinder for water–Al2O3 nanofluid at 0.1 vol %

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Fig. 10

Temperature distribution in the radial direction at middle of the cylinder for (water + EG)–Al2O3 nanofluid at 0.1 vol %

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Fig. 11

Variation of Nusselt number with different Rayleigh numbers

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Fig. 13

Variation of average Nusselt number with Rayleigh number for various concentrations of nanofluid

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Fig. 14

Comparison of experimental results with the predicted values from the model for 0.1 vol %

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