In this paper, it is estimated the heat transfer coefficient and friction factor for fully developed turbulent flow of carbon nanotube (CNT)-Fe3O4/water hybrid nanofluids flow through a tube with twisted tape inserts at constant heat flux conditions. The nanocomposite of CNT-Fe3O4 was prepared by in situ method; which contains dispersion of carboxylated-CNTs in distilled water followed by mixing of ferrous chloride and ferric chloride in the molar ratio of 2:1. Sodium hydroxide was used as reducing agent to form CNT-Fe3O4 nanocomposite. The detailed surface morphology and magnetic properties were performed by X-ray diffraction and scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The stable hybrid nanofluids were prepared by dispersing nanocomposite in distilled water, and the heat transfer and friction factor experiments were conducted for particle volume concentrations of 0.1% and 0.3%. The results indicate that a maximum of 31.10% enhancement in Nusselt number with a penalty of 1.18-times increase of pumping power was observed for particle concentration of 0.3% at a Reynolds number of 22,000 as compared to base fluid data. The Nusselt number is further enhanced to 42.51% for 0.3% nanofluid flow through a tube with twisted tape of H/D = 5 at a Reynolds number of 22,000 compared to base fluid data. The empirical correlations were proposed for the estimation of Nusselt number and friction factor to match well with the experimental data.
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June 2015
Research-Article
Heat Transfer Enhancement of Low Volume Concentration of Carbon Nanotube-Fe3O4/Water Hybrid Nanofluids in a Tube With Twisted Tape Inserts Under Turbulent Flow
L. Syam Sundar,
L. Syam Sundar
1
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: sslingala@gmail.com
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: sslingala@gmail.com
1Corresponding author.
Search for other works by this author on:
Antonio C. M. Sousa,
Antonio C. M. Sousa
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: antoniosousa@ua.pt
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: antoniosousa@ua.pt
Search for other works by this author on:
Manoj Kumar Singh
Manoj Kumar Singh
1
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: mksingh@ua.pt
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: mksingh@ua.pt
1Corresponding author.
Search for other works by this author on:
L. Syam Sundar
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: sslingala@gmail.com
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: sslingala@gmail.com
Antonio C. M. Sousa
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: antoniosousa@ua.pt
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: antoniosousa@ua.pt
Manoj Kumar Singh
Centre for Mechanical Technology
and Automation (TEMA),
Department of Mechanical Engineering,
e-mail: mksingh@ua.pt
and Automation (TEMA),
Department of Mechanical Engineering,
University of Aveiro
,Aveiro 3810-193
, Portugal
e-mail: mksingh@ua.pt
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received August 7, 2014; final manuscript received December 12, 2014; published online March 3, 2015. Assoc. Editor: Samuel Sami.
J. Thermal Sci. Eng. Appl. Jun 2015, 7(2): 021015 (12 pages)
Published Online: June 1, 2015
Article history
Received:
August 7, 2014
Revision Received:
December 12, 2014
Online:
March 3, 2015
Citation
Syam Sundar, L., Sousa, A. C. M., and Singh, M. K. (June 1, 2015). "Heat Transfer Enhancement of Low Volume Concentration of Carbon Nanotube-Fe3O4/Water Hybrid Nanofluids in a Tube With Twisted Tape Inserts Under Turbulent Flow." ASME. J. Thermal Sci. Eng. Appl. June 2015; 7(2): 021015. https://doi.org/10.1115/1.4029622
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