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INVITED PAPERS

Pool Boiling Characteristics of Carbon Nanotube Based Nanofluids Over a Horizontal Tube

[+] Author and Article Information
R. Kathiravan, A. Gupta

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247 667, India

R. Kumar1

Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247 667, Indiaravikfme@iitr.ernet.in

R. Chandra

Institute Instrumentation Centre, Indian Institute of Technology, Roorkee 247 667, India

P. K. Jain

Centre for Carbon Materials, International Advanced Research Centre for Powder Metallurgy and New Materials, Hyderabad 500005, India

1

Corresponding author.

J. Thermal Sci. Eng. Appl 1(2), 022001 (Sep 16, 2009) (7 pages) doi:10.1115/1.4000042 History: Received June 14, 2009; Revised August 17, 2009; Published September 16, 2009

This paper is mainly concerned about the pool boiling heat transfer behavior of multiwalled carbon nanotube (CNT) suspensions in water and water containing 9.0% by weight of sodium lauryl sulfate anionic surfactant (SDS) has been carried out. Three different concentrations of 0.25%, 0.5%, and 1.0% by volume of CNT in base fluids, i.e., water and water containing 9.0% by weight of sodium lauryl SDS, were prepared and boiling experiments were conducted over a 115 mm long stainless steel horizontal tube heater of 9.0 mm outer diameter and 0.5 mm thickness. The test results show that the addition of carbon nanotubes increases the boiling heat transfer coefficient of base fluids. The enhancement of heat transfer coefficient was found at 1.75, 1.2, and 1.2 folds corresponding to 0.25%, 0.5%, and 1.0% concentration of CNT by volume in water at the critical heat flux of 961kW/m2, 611kW/m2, and 508kW/m2, respectively. It was also observed that the enhancement factor was higher for lower heat fluxes, which decrease for higher heat fluxes. And also, the heat transfer coefficient enhancement in the water-CNT-surfactant nanofluids of 0.25%, 0.5%, and 1.0% of CNT concentrations are found to be 1.13, 1.44, and 1.5 times that of water at the critical heat fluxes of 295kW/m2, 231kW/m2, and 213kW/m2, respectively. Foaming was found over the free surface of all water-CNT-surfactant nanofluids during the boiling experiments. Furthermore, it was observed that there was no fouling over the test-section. For further confirmation, however, a long term study needs to be carried out.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

DC arc-discharge graphite evaporation system

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Figure 2

XRD spectra of CNT

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Figure 3

(a) TEM photograph of CNT and (b) diffraction pattern

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Figure 4

Pool boiling experimental setup

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Figure 5

Schematic diagram of heater tube

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Figure 6

(a) Comparison of boiling curve of water with Cornwell–Houston correlation and (b) variation in hexperiment versus hpredicted by Cornwell–Houston correlation

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Figure 7

Variation in heat flux with wall superheat for water-CNT nanofluids

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Figure 8

Variation in h with q for water-CNT nanofluids

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Figure 9

Variation in enhancement in heat transfer coefficient with heat flux for water-CNT nanofluids

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Figure 10

Variation in heat flux with wall superheat for water-CNT-surfactant nanofluids

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Figure 11

Variation in h with q for water-CNT-surfactant nanofluids

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Figure 12

Enhancement of h in water-CNT-surfactant nanofluids

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