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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Natural Convection of Nanofluid in Cylindrical Enclosure Filled with Porous Media
Author(s)
Manal Hadi Al-Hafidh and Hayder Ibrahim Mohammed
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DOI:10.17265/1934-8975/2013.12.007
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ABSTRACT
A numerical study has been carried out to investigate the effect of
aspect ratio on heat transfer by natural convection of nanofluid taking Cu nano particles and the water as based fluid. The flow is laminar,
steady state, axisymmetric two-dimensional in a vertical cylindrical channel
filled with porous media. Heat is generated uniformly along the center of the
channel with its vertical surface remain with cooled constant wall temperature and
insulated horizontal top and bottom surfaces. The governing equations which
used are continuity, momentum and energy equations using Darcy law and
Boussinesq’s approximation which are transformed to dimensionless equations.
The finite difference approach is used to obtain all the computational results
using the MATLAB-7 program. The parameters affected on the system are Rayleigh
number ranging within (10 ≤ Ra ≤ 103),
aspect ratio (1 ≤ As ≤ 5) and the volume fraction (0 ≤ φ ≤ 0.2). The results obtained
are presented graphically in the form of streamline and isotherm contour plots
and the results show that as φ increase from 0.01 to 0.2 the value of the mean Nusselt number increase 50.4%
for Ra = 1,000.
KEYWORDS
Laminar natural convection, nanofluid, porous media, vertical cylinder, heat generation
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