Analysis of two-dimensional porous fins with variable thermal conductivity
| Autor: | Hossein Shokouhmand, Ali Maghooli, Seyed Erfan Hosseini-Doost, Amirmohammad Sattari |
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| Rok vydání: | 2017 |
| Předmět: |
Fluid Flow and Transfer Processes
Darcy's law Materials science Fin 020209 energy Darcy number Thermodynamics 02 engineering and technology Rayleigh number Mechanics Condensed Matter Physics 01 natural sciences Nusselt number 010305 fluids & plasmas Physics::Fluid Dynamics Thermal conductivity 0103 physical sciences Heat transfer 0202 electrical engineering electronic engineering information engineering Porous medium |
| Zdroj: | Heat Transfer-Asian Research. 47:404-419 |
| ISSN: | 1099-2871 |
| DOI: | 10.1002/htj.21310 |
| Popis: | Analysis of porous fins for their higher heat transfer in comparison with solid fins with identical volumes has attracted significant attention. In this paper, a two-dimensional thermal analysis of a porous fin having variable thermal conductivity coefficient is performed using finite difference method. Heat transfer through porous media is simulated using passage velocity from Darcy's model. The thermal conductivity of the solid phase is considered as a linear function of temperature. It is found that the temperature profile of the fin is completely two-dimensional even for high Rayleigh and Darcy numbers (Ra = 103∼104, Da = 0.01), because the temperature changes significantly along the transverse axis especially for lower Rayleigh and Darcy numbers. Also, the effects of important nondimensional parameters such as Rayleigh and Darcy numbers, porosity, Nusselt, thermal conductivity, and aspect ratio on the temperature profile are investigated. The results demonstrate that the temperature distribution is strongly dependent on the Rayleigh and Darcy numbers. |
| Databáze: | OpenAIRE |
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