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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling And Simulation Of Wetted Porous Thermal Barriers Operating Under High Temperature Or High Heat Flux
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Modeling And Simulation Of Wetted Porous Thermal Barriers Operating Under High Temperature Or High Heat Flux

机译：高温或高热通量下湿式多孔热障的建模与仿真

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Porous media with high water content can be successfully used as thermal barriers to operate under high exposure temperatures and/ or high heat fluxes. Modeling and simulation of such systems presents difficulties and challenges, which are pointed and worked out in this work. Liquid water and water vapor transfers are considered, including the capillary effects for the liquid phase, as well as the air transfer inside the porous medium. Heat transfer model includes conduction, radiation, enthalpy convection, sensible heating and phase change. A realistic model is considered at the exposed boundary in what concerns mass transfer: the outflow mass transfer is dictated by the water effusion and not by the convection transfer mechanism between the exposed surface and the environment. A set of numerical aspects is detailed, concerning both the numerical modeling and the solution of the discretization equations, which are crucial to obtain successful simulations. Some illustrative results are presented, showing the potential of the wetted porous media when used as thermal barriers, as well as the capabilities of the presented physical and numerical models to deal with such systems.
机译：具有高水含量的多孔介质可以成功地用作热障，以在高暴露温度和/或高热通量下运行。这种系统的建模和仿真提出了困难和挑战，在这项工作中指出和解决了这些问题。考虑了液态水和水蒸气的转移，包括液相的毛细作用以及多孔介质内部的空气转移。传热模型包括传导，辐射，焓对流，显热和相变。在与传质有关的暴露边界处考虑了一个现实模型：流出的传质是由水的渗出而不是由暴露的表面与环境之间的对流传递机制决定的。详细介绍了一组数值方面，涉及数值模型和离散化方程的求解，这对于获得成功的仿真至关重要。呈现了一些说明性的结果，显示了当用作热障时润湿的多孔介质的潜力，以及所呈现的物理和数值模型处理此类系统的能力。

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