Entropy generation analysis of nanofluid natural convection in coaxial cylinders subjected to magnetic field
| Autor: | Essma Belahmadi, Rachid Bessaih |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Natural convection Renewable Energy Sustainability and the Environment coaxial cylinders lcsh:Mechanical engineering and machinery entropy generation natural convection magnetic field Mechanics Magnetic field Physics::Fluid Dynamics Nanofluid Entropy (information theory) nanofluid lcsh:TJ1-1570 Coaxial cylinder |
| Zdroj: | Thermal Science, Vol 23, Iss 6 Part A, Pp 3467-3479 (2019) |
| ISSN: | 0354-9836 |
| Popis: | This paper concerns with the effect of a magnetic field on the entropy generation due to natural convection of Al2O3-water nanofluid flow between coaxial cylinders of aspect ratio H/D = 2. The inner and outer cylinders are maintained at hot and cold temperatures, respectively. The top and bottom walls are thermally insulated. The finite volume method was used to discretize the mathematical equations. The present results are compared with those found in the literature, which reveal a very good agreement. The influence of dimensionless parameters such as Hartmann number, Rayleigh number, solid volume fraction of nanoparticules, ?, and inclination angle of magnetic field on streamlines, isotherms contours, local entropy generation, mean Nusselt number, total entropy generation, St, and Bejan number is discussed. The results show that the local entropy generation are strongly influenced by the application of magnetic field. The increase in heat transfer and entropy generation by adding the nanoparticles to the base fluid depends on the magnetic field strength and direction. |
| Databáze: | OpenAIRE |
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