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Heat transfer experiments in porous media under induced viscosity and density variations

机译：诱导粘度和密度变化下多孔介质中的传热实验

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摘要

The present work analyses the effects of temperature-induced density and viscosity changes on convective flow and heat transfer in saturated porous media. Attention is given to forced convection in sand in the vicinity of hydraulic-impermeable but heat conducting boundaries. A test setup with three saturated layers of clay-sand-clay was made in order to measure and understand the temperature-induced density and viscosity effects together with forced convection on the heat transfer phenomenon. Tests results show preferential flow paths in the sand layer depending on the situation. Under constant pressure gradient significant discharge variations are oticed, mainly due to viscosity effects and to a lesser part due to density changes.
机译：本工作分析了温度引起的密度和粘度变化对饱和多孔介质中对流流动和传热的影响。注意在水力不可渗透但导热边界附近的沙子中强制对流。为了测量和了解温度引起的密度和粘度效应，以及对热传递现象的强制对流，进行了三层饱和的粘土-砂-粘土层的测试。测试结果表明，根据情况，砂层中存在优先流动路径。在恒定压力梯度下，主要由于粘度效应而引起显着的放电变化，而由于密度变化而引起较小的变化。

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