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首页> 外文期刊>Journal of Heat Transfer >Developing Nonthermal-equilibrium Convection In Porous Media With Negligible Fluid Conduction
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Developing Nonthermal-equilibrium Convection In Porous Media With Negligible Fluid Conduction

机译：流体传导可忽略不计在多孔介质中发展非热平衡对流

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摘要

In certain contemporary technologies, porous media with high solid-phase conductivity are impregnated with low-conductivity fluids, e.g., metal and graphite foam cooled by air. For such cases, an approximate analytical model for the developing heat transfer inside a two-dimensional rectangular porous medium subjected to constant heat flux is presented. The model neglects conduction in the fluid and assumes plug flow. The resulting nonthermal-equilibrium equations are solved for the solid and fluid temperatures by separation of variables. The temperatures decay exponentially as the distance from the heated base increases. The effects of the Biot and Peclet numbers are presented. Fully developed heat-transfer conditions are achieved at an axial distance equal to five times the height of the porous medium, with a constant Nusselt number equal to 3.
机译：在某些现代技术中，具有高固相电导率的多孔介质被低电导率的流体例如空气冷却的金属和石墨泡沫浸渍。对于这种情况，提出了一种在恒定热通量的二维矩形多孔介质内部展开传热的近似解析模型。该模型忽略了流体中的传导并假定塞流。通过分离变量，可以求解所得的非热平衡方程式的固，液温度。随着距加热底座的距离增加，温度呈指数下降。介绍了比奥和佩克雷特数的影响。在等于多孔介质高度五倍的轴向距离上实现了充分发展的传热条件，恒定的努塞尔数等于3。

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