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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.244 SNIP: 0.434 CiteScore™: 0.7

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012004025
pages 151-158

EFFECTS OF RADIAL FINS ON THE LAMINAR NATURAL CONVECTION OF A NANOFLUID IN CONCENTRIC ANNULI

Ghanbar Ali Sheikhzadeh
Department of Mechanical Engineering, University of Kashan, Kashan, Iran
Maryam Arbaban
Isfahan University Of Technology
A. Arefmanesh
Department of Mechanical Engineering, University of Kashan, Iran

ABSTRAKT

The laminar natural convection of the Cu-water nanofluid between two horizontal concentric cylinders with four radial fins attached to the inner cylinder is studied numerically. The governing equations with the respective boundary conditions are solved by using the finite volume method and the SIMPLER algorithm. The computations are performed for various Rayleigh numbers, fin lengths, and thermal conductivity ratios. The results presented in this study are for a range of Rayleigh numbers from 103 to 105, dimensionless lengths of the fins between 0.1 to 0.4, and two thermal conductivity ratios, namely, 100 and 654. It is observed from the results that the average Nusselt number decreases with increasing the fins' lengths. However, the heat transfer rate and the average Nusselt number increase by increasing the fins' thermal conductivity at high Rayleigh numbers.


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