EFFECTS OF DENSITY INVERSION ON FREE CONVECTIVE HEAT TRANSFER IN POROUS LAYER HEATED FROM BELOW
作者： Yin-Chao Yen
DOI: 10.1016/0017-9310(74)90136-7
关键词: Rayleigh number 、 Nusselt number 、 Porous medium 、 Thermodynamics 、 Convection 、 Film temperature 、 Convective heat transfer 、 Natural convection 、 Materials science 、 Thermal
摘要: Abstract A study was conducted to investigate the effects of density inversion on free convective heat transfer in a porous layer heated from below. Glass beads water composed medium. For upper boundary at 4 and 8°C, thus eliminating effect onset convection, critical Rayleigh number found be 4π2. The evaluated by maintaining temperature 0°C. convection dependent two thermal parameters which are functions temperatures coefficients representing fluid density-temperature relation. Nusselt can represented terms modified number. heat-transfer rate significant decrease as difference across increases. small AT, causes much 100 per cent less than under non-density conditions.
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