Convection Heat Transfer Modeling of Ag Nanofluid Using Different Viscosity Theories

Authors

  • Ali Bakhsh Kasaeian Faculty of New Sciences & Technologies, University of Tehran

DOI:

https://doi.org/10.31436/iiumej.v13i1.149

Keywords:

Keywords, Ag Nanofluid, heat transfer, natural convection.

Abstract

ABSTRACT: In this paper, the effects of adding nanoparticles (including Ag) to a fluid media for improving free convection heat transfer were analysed. The free convective heat transfer was assumed to be in laminar flow regime, and the corresponding calculations and solutions were all done by the integral method. Water, as a Newtonian fluid, was considered as the base and all relevant thermo physical properties of the nanofluids were considered to be unvarying. The calculations performed and the graphs generated showed that, in general, the addition of nanoparticles to the fluid media resulted in an increment or improvement of its heat transfer coefficient. With increase in the concentration of the nanoparticles, the heat transfer rate of the fluid also increased. The increment in heat transfer is also dependent on the nanoparticles’ thermal conductivity and the viscosity theory which was utilized in the calculations. In this study, four different theories were used to calculate the viscosities of the nanofluids. The effects of viscosity on the nanofluids’ thermal conductivity were apparent from the calculations which were performed for nanoparticle concentrations of 4% or less.

 

ABSTRAK: Kajian ini menganalisis kesan penambahan nanopartikel Ag ke dalam media bendalir bagi tujuan pembaikkan pemindahan haba perolakan bebas. Perolakan bebas diandaikan berada di zon aliran laminar, di mana penyelesaian dan pengiraan telah dilakukan mengunakan kaedah kamilan. Air yang merupakan cecair Newtonian, dianggap sebagai asas dan sifat terma fizikal nanocecair dianggapkan tidak berubah. Mengikut pengiraan yang dilakukan dan graf yang diplotkan, umumnya penambahan nanopartikel kepada media bendalir menyebabkan peningkatan dan pengembangan pekali pemindahan haba. Kadar pemindahan haba meningkat dengan nanopartikel. Peningkatan pemindahan haba juga bergantung kepada pengalir haba nanopartikel dan teori kelikatan yang digunakan. Di dalam kajian ini, empat jenis teori telah digunakan bagi pengiraan kelikatan nanopartikel. Kesan kelikatan ke atas pengalir haba nanocecair sangat jelas kelihatan. Kesemua pengiraan telah dilakukan ke atas kepekatan kurang dari 4%.

KEYWORDS: Ag nanofluid, heat transfer, natural convection.

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Author Biography

Ali Bakhsh Kasaeian, Faculty of New Sciences & Technologies, University of Tehran

BIOGRAPHIES

Ali Bakhsh Kasaeian received his B.Sc. degree in Chemical Engineering from Iran University of Science & Technology (IUST) in 1997.  He obtained his M.Sc. degree in 2001 in University of Tehran, Iran. Finally, he obtained his Ph.D degree in Chemical Engineering in University of Tehran, 2005. His research interests are mainly in new materials and renewable energies.

Mojtaba Ayatollahi , he obtained his Ph.D degree in Mechanical Engineering from University of amikabir (poly tecknik)2007 .

 

Shiva Naasiri received her B.Sc. degree in Mechanical Engineering from University of Zanjan in 2010.  She has worked on many modelling papers about nano material. Her research interests are mainly in nano materials and nanofluids.

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Published

2012-04-20

How to Cite

Kasaeian, A. B. (2012). Convection Heat Transfer Modeling of Ag Nanofluid Using Different Viscosity Theories. IIUM Engineering Journal, 13(1). https://doi.org/10.31436/iiumej.v13i1.149

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Articles