Natural convection heat transfer from a horizontal cylinder embedded in a porous medium
| Autor: | T.E. Steinberger, R.M. Fand, Ping Cheng |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
Fluid Flow and Transfer Processes
Natural convection Materials science Convective heat transfer Mechanical Engineering Thermodynamics Mechanics Rayleigh number Heat transfer coefficient Condensed Matter Physics Nusselt number Cylinder (engine) law.invention Physics::Fluid Dynamics law Heat transfer Porous medium |
| Zdroj: | International Journal of Heat and Mass Transfer. 29:119-133 |
| ISSN: | 0017-9310 |
| DOI: | 10.1016/0017-9310(86)90040-2 |
| Popis: | This paper presents the results of an experimental investigation of heat transfer by natural convection from a horizontal cylinder embedded in porous media consisting of randomly packed glass spheres saturated by either water or silicone oil. It is shown that the overall range of the Rayleigh number, Ra, can be divided into two subregions, called ‘low’ and ‘high’, in each of which the Nusselt number, Nu, behaves differently. It is demonstrated that the low Ra region corresponds to Darey flow and the high to Forchheimer flow. Correlation equations for Nu for the Darcy regime are presented that account for viscous dissipation, and others for the Forchheimer regime that involve the first and second Forchheimer coefficients. The variation of properties with temperature and the wall effect on porosity (and consequently on heat transfer) are considered. The paper includes information concerning the resistance to flow in porous media that was obtained in conjunction with the heat transfer study. |
| Databáze: | OpenAIRE |
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