Research Papers

Numerical Simulation of Natural Convection Heat Transfer of Nanofluid With Cu, MWCNT, and Al2O3 Nanoparticles in a Cavity With Different Aspect Ratios

[+] Author and Article Information
Hossein Goodarzi

Young Researchers and Elite Club,
Aligoudarz Branch,
Islamic Azad University,
Aligoudarz, Iran
e-mail: cfd.eng.omid@gmail.com

Omid Ali Akbari

Young Researchers and Elite Club,
Khomeinishahr Branch,
Islamic Azad University,
Khomeinishahr, Isfahan, Iran
e-mail: akbariomid11@gmail.com

Mohammad Mohsen Sarafraz

School of Mechanical Engineering,
The University of Adelaide,
South Australia, Australia
e-mail: mohammadmohsen.sarafraz@adelaide.edu.au

Majid Mokhtari Karchegani

Department of Mechanical Engineering,
Khomeinishahr Branch,
Islamic Azad University,
Khomeinishahr, Iran
e-mail: majidmokhtari2010@yahoo.com

Mohammad Reza Safaei

Division of Computational Physics,
Institute for Computational Science,
Ton Duc Thang University,
Ho Chi Minh City, Vietnam;
Faculty of Electrical and Electronics Engineering,
Ton Duc Thang University,
Ho Chi Minh City, Vietnam
e-mail: cfd_safaei@tdtu.edu.vn

Gholamreza Ahmadi Sheikh Shabani

Young Researchers and Elite Club,
Khomeinishahr Branch,
Islamic Azad University,
Khomeinishahr, Isfahan, Iran
e-mail: ghrahmadi22@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Thermal Science and Engineering Applications. Manuscript received April 1, 2019; final manuscript received May 12, 2019; published online June 12, 2019. Assoc. Editor: Dr. Ali J. Chamkha.

J. Thermal Sci. Eng. Appl 11(6), 061020 (Jun 12, 2019) (4 pages) Paper No: TSEA-18-1620; doi: 10.1115/1.4043809 History: Received April 01, 2019; Accepted May 13, 2019

Effect of the size of a closed cavity and different nanoparticles on natural convection heat transfer is investigated using the finite volume method. In the current numerical study, free convection of nanofluid with Cu, multi-walled carbon nanotubes, and Al2O3 nanoparticles is considered at Rayleigh numbers (Ra) of 10–100,000 inside a two-dimensional rectangular cavity with different aspect ratios. Results of this study show that in the presence of cooling fluid with low temperature and hot zone in the cavity, due to the temperature difference between the fluid and hot zone, heat transfer occurs. Heat transfer in the cavity is influenced by fluid circulation caused by natural convection heat transfer and conductive heat transfer mechanism.

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Grahic Jump Location
Fig. 1

Validation of present research with experimental results of Keyhani et al. [11]

Grahic Jump Location
Fig. 2

Variations of average surface friction factor versus Ra: (a) Ra=1000, hot wall, (b) Ra=100,000, hot wall, (c) Ra=1000, cold wall, and (d) Ra=100,000, cold wall

Grahic Jump Location
Fig. 3

Average Nusselt number diagrams for different cavity aspect ratios: (a) Al2O3, (b) Cu, and (c) MWCNT

Grahic Jump Location
Fig. 4

Average entropy curves for different aspect ratios of the cavity: (a) Al2O3, (b) Cu, and (c) MWCNT



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