Laminar natural convection of Cuwater nanofluid in concentric annuli with radial fins attached to the inner cylinder
 G. A. Sheikhzadeh,
 M. Arbaban,
 M. A. Mehrabian
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Abstract
Laminar natural convection of Cuwater nanofluid between two horizontal concentric cylinders with radial fins attached to the inner cylinder is studied numerically. The inner and outer cylinders are maintained at constant temperature. The governing equations in the polar twodimensional space with the respective boundary conditions are solved using the finite volume method. The hybridscheme is used to discretize the convection terms. In order to couple the velocity field and the pressure in the momentum equations, the well known semiimplicit method for pressure linked equation reformed algorithm is adopted. Using the developed code, a parametric study is undertaken, and the effects of the Rayleigh number, Number of fins, length of the fins and the volume fraction of nanoparticles on the fluid flow and heat transfer inside the annuli are investigated. In this study, two cases with different number of fins are considered. It is observed from the results that the average Nusselt number increases with increasing both the Rayleigh number and the volume fraction of the nanoparticles. Moreover, the average Nusselt number decreases by increasing the fins’ length and the number of fins. Heat transfer rate increases by increasing the fins’ length at all Rayleigh numbers, but it increases by increasing the number of fins at high Rayleigh numbers.
Inside
Within this Article
 Introduction
 Problem definition and basic equations
 Numerical procedure
 Benchmarking of the code
 Optimum grid size
 Results and discussions
 Conclusions
 References
 References
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 Title
 Laminar natural convection of Cuwater nanofluid in concentric annuli with radial fins attached to the inner cylinder
 Journal

Heat and Mass Transfer
Volume 49, Issue 3 , pp 391403
 Cover Date
 20130301
 DOI
 10.1007/s0023101210849
 Print ISSN
 09477411
 Online ISSN
 14321181
 Publisher
 SpringerVerlag
 Additional Links
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 Industry Sectors
 Authors

 G. A. Sheikhzadeh ^{(1)}
 M. Arbaban ^{(1)}
 M. A. Mehrabian ^{(2)}
 Author Affiliations

 1. Department of Mechanical Engineering and Energy Research Institute, University of Kashan, Kashan, Iran
 2. Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran